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Mitsubishi MOTORS Eclipse Manual

Multiport fuel injection (mfi)

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GENERAL DESCRIPTION. . . . . . . . .

MULTIPORT FUEL INJECTION (MFI)

DIAGNOSIS . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOTING STRATEGY . . . . . .

TROUBLE CODE DIAGNOSIS. . . . . . . . . .

FAIL-SAFE FUNCTION REFERENCE

TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DIAGNOSTIC TROUBLE CODE CHART . .

SYMPTOM CHART. . . . . . . . . . . . . . . . . . .

DIAGNOSTIC TROUBLE CODE

PROCEDURES. . . . . . . . . . . . . . . . . . . . . .

SYMPTOM PROCEDURES . . . . . . . . . . . .

DATA LIST REFERENCE TABLE . . . . . . .

ACTUATOR TEST REFERENCE TABLE. .

CHECK AT THE ENGINE CONTROL MODULE

(ECU) <M/T> OR POWERTRAIN CONTROL

MODULE (PCM) <A/T>. . . . . . . . . . . . . . . .

INSPECTION PROCEDURE USING AN

OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . .

SPECIAL TOOLS. . . . . . . . . . . . . . . .

ON-VEHICLE SERVICE. . . . . . . . . . .

COMPONENT LOCATION . . . . . . . . . . . . .

THROTTLE BODY (THROTTLE VALVE AREA)

CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .

THROTTLE POSITION SENSOR

ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . .

GROUP 13B

CONTENTS

13B-3

BASIC IDLE SPEED ADJUSTMENT . . . . .

FUEL PRESSURE TEST . . . . . . . . . . . . . .

FUEL PUMP CONNECTOR DISCONNECTION

(HOW TO REDUCE PRESSURIZED FUEL

LINES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FUEL PUMP OPERATION CHECK . . . . . .

MULTIPORT FUEL INJECTION (MFI) RELAY

CONTINUITY CHECK . . . . . . . . . . . . . . . . .

FUEL PUMP RELAY CONTINUITY

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTAKE AIR TEMPERATURE SENSOR

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENGINE COOLANT TEMPERATURE SENSOR

13B-530

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-640

THROTTLE POSITION SENSOR CHECK .

13B-654

HEATED OXYGEN SENSOR CHECK . . . .

INJECTOR CHECK . . . . . . . . . . . . . . . . . . .

IDLE AIR CONTROL MOTOR CHECK . . . .

13B-655

EVAPORATIVE EMISSION PURGE SOLENOID

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-661

EGR SOLENOID CHECK . . . . . . . . . . . . . .

EVAPORATIVE EMISSION VENTILATION

13B-671

SOLENOID CHECK . . . . . . . . . . . . . . . . . .

VARIABLE INDUCTION CONTROL SOLENOID

13B-672

CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13B-672

INJECTOR . . . . . . . . . . . . . . . . . . . . .

13B-677

REMOVAL AND INSTALLATION . . . . . . . .

13B-677

13B-1

13B-679

13B-680

13B-682

13B-682

13B-682

13B-682

13B-682

13B-683

13B-684

13B-686

13B-686

13B-687

13B-687

Continued on next page

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Summary of Contents for Mitsubishi MOTORS Eclipse

Page 1: Table Of Contents
13B-1 GROUP 13B CONTENTS GENERAL DESCRIPTION..13B-3 BASIC IDLE SPEED ADJUSTMENT ..13B-679 FUEL PRESSURE TEST ....13B-680 MULTIPORT FUEL INJECTION (MFI) FUEL PUMP CONNECTOR DISCONNECTION...
Page 2 13B-2 THROTTLE BODY ASSEMBLY ..13B-689 FASTENER TIGHTENING SPECIFICATIONS....13B-692 REMOVAL AND INSTALLATION ..13B-689 GENERAL SPECIFICATIONS .
Page 3 13B-3 MULTIPORT FUEL INJECTION (MFI) <3.0L> GENERAL INFORMATION GENERAL INFORMATION M1131000100325 IGNITION TIMING CONTROL The Multiport Fuel Injection System consists of sen- The ignition power transistor located in the ignition sors which detect the engine conditions, the ENGINE primary circuit turns ON and OFF to control the pri- CONTROL MODULE (ECM) <M/T>/POWERTRAIN mary current flow to the ignition coil.
Page 4 13B-4 MULTIPORT FUEL INJECTION (MFI) <3.0L> GENERAL INFORMATION MALTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM <Without variable induction system> SENSE DECIDE 1 LEFT BANK HEATED OXYGEN SENSOR (FRONT) ECM<M/T> 1 INJECTOR 2 VOLUME AIR FLOW SENSOR PCM<A/T> 2 EVAPORATIVE EMISSION 3 INTAKE AIR TEMPERATURE SENSOR PURGE SOLENOID 4 THROTTLE POSITION SENSOR 3 IDLE AIR CONTROL MOTOR...
Page 5 13B-5 MULTIPORT FUEL INJECTION (MFI) <3.0L> GENERAL INFORMATION <With variable induction system> SENSE DECIDE 1 LEFT BANK HEATED OXYGEN SENSOR (FRONT) ECM<M/T> 1 INJECTOR 2 VOLUME AIR FLOW SENSOR 2 EVAPORATIVE EMISSION PCM<A/T> 3 INTAKE AIR TEMPERATURE SENSOR PURGE SOLENOID 4 THROTTLE POSITION SENSOR 3 IDLE AIR CONTROL MOTOR 5 CAMSHAFT POSITION SENSOR...
Page 6: Multiport Fuel Injection (Mfi) Diagnosis
13B-6 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING STRATEGY M1131150000104 NOTE: If a DTC is erased, its "freeze frame" data will 6. If there is a DTC, record the number of the code, be also erased and the readiness test status will be then erase the code from the memory using the reset.
Page 7 13B-7 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Items Indicated by the Service Engine Soon/Malfunction Indicator Lamp DTC NO. ITEMS Engine control module (ECM) <M/T> or Powertrain control module (PCM) <A/T> malfunction P0101 Volume air flow circuit range/performance problem P0102 Volume air flow circuit low input P0106*...
Page 8 13B-8 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC NO. ITEMS P0161 Heated oxygen sensor heater circuit (bank 2 sensor 2) P0171 System too lean (bank 1) P0172 System too rich (bank 1) P0174 System too lean (bank 2) P0175 System too rich (bank 2) P0181...
Page 9 13B-9 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC NO. ITEMS P0513 Immobilizer malfunction P0551 Power steering pressure sensor circuit range/performance P0660 Variable induction control circuit malfunction P0705 Transmission range sensor circuit malfunction (RPNDL input) P0712 Transmission fluid temperature sensor circuit low input P0713 Transmission fluid temperature sensor circuit high input P0715...
Page 10 13B-10 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODE Refer to GROUP 13A, Trouble code diagnosis − How to Read and Erase Diagnostic Trouble Codes P.13A-5. PROVISIONAL DTCs [MUT-II OBD-II Test Mode- Results (Mode 5)] Refer to GROUP 13A,Trouble code diagnosis −...
Page 11 13B-11 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TEST MONITORING SIMPLE TECHNICAL INDICATION OF SCAN CONVERSION ITEM DESCRIPTION TOOL COEFFICIENT IN USING GENERAL SCAN TOOL Evaporation ECM <M/T> or PCM <A/T> EVAP Leak Mon. Gross × 0.032 kPa leak monitor monitors the leak of fuel Pressure Value...
Page 12 13B-12 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSTIC BY DIAGNOSTIC TEST MODE II (INCREASED SENSITIVITY) Refer to GROUP 13A, Trouble code diagnosis − Diagnostic by Diagnostic Test Mode II (Increased Sensitivity) P.13A-5. INSPECTION USING SCAN TOOL MB991502, DATA LIST AND ACTUATOR TESTING Required Special Tool: •...
Page 13 13B-13 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS NOTE: If the ECM <M/T> or PCM <A/T> detects multiple malfunctions, the ECM <M/T> or PCM <A/T> stores the data for only the first item that was detected. However, if the ECM <M/T> or PCM <A/T> detects a misfire or a fuel system malfunction, ECM <M/T> or PCM <A/T>...
Page 14 13B-14 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DRIVE CYCLE PATTERN LIST PROCEDURE MONITOR ITEM DIAGNOSTIC TROUBLE CODE (DTC) Evaporative emission control system leak monitor P0441, P0442, P0451, P0452, P0453, P0455, P0456 Fuel trim monitor P0171, P0172, P0174, P0175 Catalytic converter monitor P0421, P0431...
Page 15 13B-15 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS PROCEDURE 1 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK MONITOR P0441, P0442, P0451, P0452, P0453, P0455, P0456 Drive cycle One drive [from start to ignition switch to the "LOCK" (OFF) position] will be completed while traveling with the following drive pattern.
Page 16 13B-16 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS PROCEDURE 2 FUEL TRIM MONITOR P0171, P0172,P0174, P0175 Drive cycle This monitor [from start to ignition switch to the "LOCK" (OFF) position] will be completed pattern while traveling with the following drive cycle pattern. It will take 35 minutes. You must complete this drive twice.
Page 17 13B-17 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS PROCEDURE 3 CATALYTIC CONVERTER MONITOR P0421, P0431 Drive cycle This monitor [from start to ignition switch to the "LOCK" (OFF) position] will be completed while traveling with the following drive cycle pattern. It will take 20 minutes. You must pattern complete this drive twice.
Page 18 13B-18 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS PROCEDURE 4 HEATED OXYGEN SENSOR MONITOR P0133, P0139, P0153, P0159 Drive cycle This monitor [from start to ignition switch to the "LOCK" (OFF) position] will be completed pattern while traveling with the following drive cycle pattern. It will take 5 minutes. You must complete this drive twice.
Page 19 13B-19 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS PROCEDURE 5 EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR P0401 Drive cycle This monitor [from start to ignition switch to the "LOCK" (OFF) position] will be completed pattern while traveling with the following drive cycle pattern. It will take 10 minutes. You must complete this drive twice.
Page 20 13B-20 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS PROCEDURE 6 OTHER MONITOR (Main components, sensors and switches, wire breakage and short circuit) • Main components: P0134, P0154, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0506, P0507, P1400 •...
Page 21: Fail-Safe Function Reference Table
13B-21 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS READINESS TEST STATUS When the monitors run and complete, the MUT II will record the Readiness Code as "Complete" (General Purpose Scan Tools record as "Ready"). If the monitor did not The Readiness function also referred as I/M Readi- run completely, the system then reads as "Incom- ness or I/M Flags indicate if a full diagnostic check...
Page 22: Diagnostic Trouble Code Chart
13B-22 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MALFUNCTION ITEM CONTROL CONTENTS DURING MALFUNCTION Knock sensor Switches the ignition timing from ignition timing for high octane to ignition timing for standard octane fuel. Communication line with No ignition timing retard control (overall engine-transaxle control) achieved transaxle control CPU when transaxle speeds are changed.
Page 23 13B-23 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC CODE DIAGNOSTIC ITEMS REFERENCE PAGE P0137 Heated oxygen sensor circuit low voltage (bank 1 sensor 2) P.13B-166 P0138 Heated oxygen sensor circuit high voltage (bank 1 sensor 2) P.13B-171 P0139 Heated oxygen sensor circuit slow response (bank 1 sensor 2)
Page 24 13B-24 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC CODE DIAGNOSTIC ITEMS REFERENCE PAGE P0335 Crankshaft position sensor circuit P.13B-315 P0340 Camshaft position sensor circuit P.13B-327 P0401 Exhaust gas recirculation flow insufficient detected P.13B-336 P0403 Exhaust gas recirculation control circuit P.13B-338 P0421 Warm up catalyst efficiency below threshold (bank 1)
Page 25 13B-25 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC CODE DIAGNOSTIC ITEMS REFERENCE PAGE • A/T DTC No. 43 (3rd gear incorrect ratio) P0733 Gear 3 incorrect ratio P.23A-40 P0734 Gear 4 incorrect ratio • A/T DTC No. 44 (4th gear incorrect ratio) P.23A-40 •...
Page 26: Symptom Chart
13B-26 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS SYMPTOM CHART M1131151500157 NOTE: Check that the engine control module (ECM) <M/T> or powertrain control module (PCM) <A/T> ground circuit is normal before checking for the cause of the problem. SYMPTOMS INSPECTION REFERENCE...
Page 27 13B-27 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS SYMPTOMS INSPECTION REFERENCE PROCEDURE PAGE Fuel pump system P.13B-614 Ignition switch − ST system <M/T> P.13B-624 Ignition switch-ST system and park/neutral position switch system <A/ P.13B-629 T> Ignition circuit system P.13B-633 A/C system P.13B-638...
Page 28 13B-28 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS ITEMS SYMPTOM Driving Hesitation Sag " Hesitation " is the delay in VEHICLE response of the vehicle speed SPEED (engine speed). This occurs when HESITATION NORMAL the accelerator is depressed in INITIAL ACCELE- order to accelerate from the speed...
Page 29: Diagnostic Trouble Code Procedures
13B-29 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSTIC TROUBLE CODE PROCEDURES DTC P0101: Volume Air Flow Circuit Range/Performance Ploblem Volume Air Flow Sensor Circuit BATTERY A-18X RELAY B-14 VOLUME AIR 1 2 3 4 5 6 7 FLOW SENSOR C-58 <M/T>...
Page 30 13B-30 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS:C-51,C-58<M/T> CONNECTOR: A-18X C-52,C-55<A/T> PCM<A/T> ECM<M/T> MFI RELAY C-52 C-55 C-51 C-58 AK101363AB AK000225 CONNECTOR : B-14 VOLUME AIR FLOW SENSOR ACX02480 CIRCUIT OPERATION DTC SET CONDITIONS • The volume air flow sensor power is supplied Check Conditions from the MFI relay (terminal 4), and the ground is •...
Page 31 13B-31 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tools • MB991502: Scan Tool (MUT-II) STEP 1. Using scan tool MB991502, check data list item 12: Volume Air Flow Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 32 13B-32 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-14 at volume air flow sensor and connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : B-14 YES : Go to Step 4.
Page 33 13B-33 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the reset signal voltage at volume air flow sensor connector B-14 by backprobing. (1) Do not disconnect the connector B-14. (2) Start the engine and run at idle. (3) Measure the voltage between terminal 7 and ground by backprobing.
Page 34 13B-34 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for open circuit and harness damage between volume air flow sensor connector B-14 terminal 7 and ECM connector C-51 terminal 19 <M/T> or PCM connector C-52 terminal 19 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-14 YES : Replace the ECM or PCM.
Page 35 13B-35 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0102: Volume Air Flow Circuit Low Input Volume Air Flow Sensor Circuit BATTERY A-18X RELAY B-14 VOLUME AIR 1 2 3 4 5 6 7 FLOW SENSOR C-58 <M/T> (MU803782) C-51 <M/T>, C-52 <A/T>...
Page 36 13B-36 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS:C-51,C-58<M/T> CONNECTOR: A-18X C-52,C-55<A/T> PCM<A/T> ECM<M/T> MFI RELAY C-52 C-55 C-51 C-58 AK101363AB AK000225 CONNECTOR : B-14 VOLUME AIR FLOW SENSOR ACX02480 CIRCUIT OPERATION DTC SET CONDITIONS • The volume air flow sensor power is supplied Check Conditions from the MFI relay (terminal 4), and the ground is •...
Page 37 13B-37 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 12: Volume Air Flow Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 38 13B-38 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the power supply voltage at volume air flow sensor harness side connector B-14. (1) Disconnect the connector B-14 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 4 and ground.
Page 39 13B-39 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the sensor supply voltage at volume air flow sensor harness side connector B-14. (1) Disconnect the connector B-14 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 3 and ground.
Page 40 13B-40 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check for short circuit to ground between volume air flow sensor connector B-14 terminal 3 and ECM connector C-58 terminal 61 <M/T> or PCM connector C-55 terminal 65 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-14 YES : Replace the ECM or PCM.
Page 41 13B-41 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 11. NO : Repair or replace it.
Page 42 13B-42 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0102 is output? YES : Retry the troubleshooting.
Page 43 13B-43 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC SET CONDITIONS CIRCUIT OPERATION • A 5-volt voltage is supplied to the barometric Check Conditions pressure sensor power terminal (terminal 1) from • Barometric pressure is lower than 76 kPa (11 the ECM (terminal 42) <M/T>...
Page 44 13B-44 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the continuity at barometric pressure sensor harness side connector B-14. (1) Disconnect the connector B-14 and measure at the harness B-14 HARNESS side. SIDE CONNECTOR (2) Check for the continuity between terminal 5 and ground. •...
Page 45 13B-45 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 7. NO : Repair or replace it.
Page 46 13B-46 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0106 is output? YES : Retry the troubleshooting.
Page 47 13B-47 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CIRCUIT OPERATION DTC SET CONDITIONS • A 5-volt voltage is supplied to the barometric Check Conditions pressure sensor power terminal (terminal 1) from • 2 seconds or more have passed since the start- the ECM (terminal 42) <M/T>...
Page 48 13B-48 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the sensor output voltage at barometric pressure sensor connector B-14 by backprobing. (1) Do not disconnect the connector B-14. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 2 and ground by backprobing.
Page 49 13B-49 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector B-14 at the barometric pressure sensor and connector C-58 at ECM <M/T> or connector C- 55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : B-14 YES : Go to Step 5.
Page 50 13B-50 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector B-14 at the barometric pressure sensor and connector C-58 at ECM <M/T> or connector C- 55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : B-14 YES : Repair harness wire between barometric pressure sensor connector B-14 terminal 2 and ECM connector...
Page 51 13B-51 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the sensor supply voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the connector C-58 <M/T> or C-55 <A/ T>.
Page 52 13B-52 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connector B-14 at the barometric pressure sensor and connector C-58 at ECM <M/T> or connector C- 55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : B-14 YES : Repair harness wire between barometric pressure sensor connector B-14 terminal 1 and ECM connector...
Page 53 13B-53 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check for short circuit to ground between barometric pressure sensor connector B-14 terminal 1 and ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-14 YES : Replace the ECM or PCM.
Page 54 13B-54 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check connector B-14 at the barometric pressure sensor and connector C-51 at ECM <M/T> or connector C- 52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : B-14 YES : Go to Step 14.
Page 55 13B-55 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 15. Check connector B-14 at barometric pressure sensor for damage. Q: Is the connector in good condition? CONNECTOR : B-14 YES : Go to Step 16. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 56 13B-56 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 18. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0107 is output? YES : Retry the troubleshooting.
Page 57 13B-57 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CIRCUIT OPERATION DTC SET CONDITIONS • A 5-volt voltage is supplied to the barometric Check Conditions pressure sensor power terminal (terminal 1) from • 2 seconds or more have passed since the start- the ECM (terminal 42) <M/T>...
Page 58 13B-58 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the sensor output voltage at barometric pressure sensor connector B-14 by backprobing. (1) Do not disconnect the connector B-14. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 2 and ground by backprobing.
Page 59 13B-59 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list item 25: Barometric Pressure Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 60 13B-60 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the ground voltage at barometric pressure sensor connector B-14 by backprobing. (1) Do not disconnect the connector B-14. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 5 and ground by backprobing.
Page 61 13B-61 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for open circuit between barometric pressure sensor connector B-14 terminal 5 and ECM connector C-51 terminal 34 <M/T> or PCM connector C-52 terminal 16 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-14 YES : Replace the ECM or PCM.
Page 62 13B-62 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0108 is output? YES : Retry the troubleshooting.
Page 63 13B-63 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CIRCUIT OPERATION DTC SET CONDITIONS • Approximately 5 volts are applied to the intake air Check Conditions temperature sensor output terminal (terminal 6) • Engine coolant temperature is higher than 76°C from the ECM (terminal 62) <M/T>...
Page 64 13B-64 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the intake air temperature sensor. (1) Disconnect the intake air temperature sensor connector B- CONNECTOR : B-14 INTAKE AIR TEMPERATURE SENSOR ACX02480 (2) Measure the resistance between intake air temperature sensor side connector terminal 5 and 6.
Page 65 13B-65 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the continuity at intake air temperature sensor harness side connector B-14. (1) Disconnect the connector B-14 and measure at the harness B-14 HARNESS side. SIDE CONNECTOR (2) Check for the continuity between terminal 5 and ground.
Page 66 13B-66 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 8. NO : Repair or replace it.
Page 67 13B-67 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TC P0112: Intake air temperature Circuit Low Input Intake Air Temperature Sensor Circuit B-14 INTAKE AIR TEMPERATURE SENSOR (INCORPORATED IN VOLUME AIR 4 5 6 FLOW SENSOR) C-58 <M/T> (MU803782) 34 <M/T>*1 62 <M/T>*2...
Page 68 13B-68 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC SET CONDITIONS TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:) Check Conditions • Intake air temperature sensor failed. • 2 seconds or more have passed since the start- •...
Page 69 13B-69 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the intake air temperature sensor. (1) Disconnect the intake air temperature sensor connector B- CONNECTOR : B-14 INTAKE AIR TEMPERATURE SENSOR ACX02480 (2) Measure the resistance between intake air temperature sensor side connector terminal 5 and 6.
Page 70 13B-70 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Replace the ECM or PCM. Then go to Step 6. NO : Repair or replace it.
Page 71 13B-71 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0113: Intake air temperature Circuit High Input Intake Air Temperature Sensor Circuit B-14 INTAKE AIR TEMPERATURE SENSOR (INCORPORATED IN VOLUME AIR 4 5 6 FLOW SENSOR) C-58 <M/T> (MU803782) 34 <M/T>*1 62 <M/T>*2...
Page 72 13B-72 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC SET CONDITIONS TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:) Check Conditions • Intake air temperature sensor failed. • 2 seconds or more have passed since the start- •...
Page 73 13B-73 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the intake air temperature sensor. (1) Disconnect the intake air temperature sensor connector B- CONNECTOR : B-14 INTAKE AIR TEMPERATURE SENSOR ACX02480 (2) Measure the resistance between intake air temperature sensor side connector terminal 5 and 6.
Page 74 13B-74 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the sensor supply voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 75 13B-75 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Replace the ECM or PCM. Then go to Step 11. NO : Repair or replace it.
Page 76 13B-76 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit between intake air temperature sensor connector B-14 and ECM connector C- 51 <M/T> or PCM connector C-52 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-14 YES : Replace the ECM or PCM.
Page 77 13B-77 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem Engine Coolant Temperature Sensor Circuit B-11 (MU802406) ENGINE COOLANT TEMPERATURE SENSOR 49 <M/T> C-58 <M/T> 57 <A/T> (MU803782) 46 47 58 59 ENGINE CONTROL 60 61 67 68...
Page 78 13B-78 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TECHNICAL DESCRIPTION • However, time is not counted if any of the follow- • The engine coolant temperature sensor converts ing conditions are met. the engine coolant temperature to a voltage and 1.
Page 79 13B-79 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the sensor output voltage at engine coolant temperature sensor connector B-11 by backprobing. (1) Do not disconnect the connector B-11. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 1 and ground by B-11 CONNECTOR backprobing.
Page 80 13B-80 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list item 21: Engine Coolant Temperature Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 81 13B-81 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Replace the ECM or PCM. Then go to Step 14. NO : Repair or replace it.
Page 82 13B-82 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between engine coolant temperature sensor connector B-11 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-11 ENGINE...
Page 83 13B-83 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the engine coolant temperature sensor. (1) Disconnect the engine coolant temperature sensor CONNECTOR : B-11 ENGINE connector B-11. COOLANT (2) Remove the engine coolant temperature sensor. TEMPERATURE SENSOR ACX02490...
Page 84 13B-84 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check for harness damage between engine coolant temperature sensor connector B-11 terminal 1 and ECM connector C-58 terminal 44 <M/T> or PCM connector C-55 terminal 44 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-11 ENGINE...
Page 85 13B-85 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0117: Engine Coolant Temperature Circuit Low Input Engine Coolant Temperature Sensor Circuit B-11 (MU802406) ENGINE COOLANT TEMPERATURE SENSOR 49 <M/T> C-58 <M/T> 57 <A/T> (MU803782) 46 47 58 59 ENGINE CONTROL 60 61 67 68...
Page 86 13B-86 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Judgement Criteria TECHNICAL DESCRIPTION • Engine coolant temperature sensor output volt- • The engine coolant temperature sensor converts age has continued to be 0.1 volt or lower [corre- the engine coolant temperature to a voltage and sponding to a coolant temperature of 140°C output it.
Page 87 13B-87 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check for short circuit to ground between engine coolant temperature sensor connector B-11 and ECM connector C-58 <M/T> or PCM connector C-55 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-11 ENGINE YES : Go to Step 4.
Page 88 13B-88 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the engine coolant temperature sensor. (1) Disconnect the engine coolant temperature sensor CONNECTOR : B-11 ENGINE connector B-11. COOLANT (2) Remove the engine coolant temperature sensor. TEMPERATURE SENSOR ACX02490...
Page 89 13B-89 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0118: Engine Coolant Temperature Circuit High Input Engine Coolant Temperature Sensor Circuit B-11 (MU802406) ENGINE COOLANT TEMPERATURE SENSOR 49 <M/T> C-58 <M/T> 57 <A/T> (MU803782) 46 47 58 59 ENGINE CONTROL 60 61 67 68...
Page 90 13B-90 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Judgement Criteria TECHNICAL DESCRIPTION • Engine coolant temperature sensor output volt- • The engine coolant temperature sensor converts age has continued to be 4.6 volts or higher [cor- the engine coolant temperature to a voltage and responding to a coolant temperature of −45°C (−...
Page 91 13B-91 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the sensor supply voltage at engine coolant temperature sensor harness side connector B-11. (1) Disconnect the connector B-11 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 1 and ground.
Page 92 13B-92 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Repair harness wire between engine coolant temperature sensor connector B-11 and ECM ECM<M/T>...
Page 93 13B-93 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 9. NO : Repair or replace it.
Page 94 13B-94 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the engine coolant temperature sensor. (1) Disconnect the engine coolant temperature sensor CONNECTOR : B-11 ENGINE connector B-11. COOLANT (2) Remove the engine coolant temperature sensor. TEMPERATURE SENSOR ACX02490...
Page 95 13B-95 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0121: Throttle Position Sensor Circuit Range/Performance Problem Throttle Position Sensor (TPS) Circuit B-07 (MU802724) THROTTLE POSITION 2 3 4 SENSOR AUTO-CRUISE CONTROL SYSTEM <M/T>*1 <M/T>*2 <M/T>*1 <A/T>*3 <A/T>*4 <A/T>*3 ENGINE CONTROL MODULE (ECM) <M/T>...
Page 96 13B-96 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CIRCUIT OPERATION • Engine speed is higher than 2,000 r/min. • A 5-volt power supply is applied on the TPS • Volumetric efficiency is higher than 60 percent. power terminal (terminal 4) from the ECM (termi- Judgement Criteria nal 42) <M/T>...
Page 97 13B-97 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check connector B-07 at throttle position sensor for damage. Q: Is the connector in good condition? CONNECTOR : B-07 YES : Go to Step 3. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 98 13B-98 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the sensor supply voltage at throttle position sensor harness side connector B-07. (1) Disconnect the connector B-07 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 4 and ground.
Page 99 13B-99 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check for harness damage between throttle position sensor connector B-07 terminal 4 and ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-07 YES : Replace the ECM or PCM.
Page 100 13B-100 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 9. NO : Repair or replace it.
Page 101 13B-101 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check for harness damage between throttle position sensor connector B-07 terminal 3 and ECM connector C-62 terminal 78 <M/T> or PCM connector C-59 terminal 78 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-07 YES : Go to Step 12.
Page 102 13B-102 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Using scan tool MB991502, check data list item 14: Throttle Position Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 103 13B-103 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0122: Throttle Position Sensor Circuit Low Input Throttle Position Sensor (TPS) Circuit B-07 (MU802724) THROTTLE POSITION 2 3 4 SENSOR AUTO-CRUISE CONTROL SYSTEM <M/T>*1 <M/T>*2 <M/T>*1 <A/T>*3 <A/T>*4 <A/T>*3 ENGINE CONTROL MODULE (ECM) <M/T>...
Page 104 13B-104 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CIRCUIT OPERATION DTC SET CONDITIONS • A 5-volt power supply is applied on the TPS Check Conditions power terminal (terminal 4) from the ECM (termi- • 2 seconds or more have passed since the start- nal 42) <M/T>...
Page 105 13B-105 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check connector B-07 at throttle position sensor for damage. Q: Is the connector in good condition? CONNECTOR : B-07 YES : Go to Step 3. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 106 13B-106 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check for open circuit and short circuit to ground between throttle position sensor connector B-07 terminal 4 and ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-07 YES : Replace the ECM or PCM.
Page 107 13B-107 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-58, C-62 at ECM <M/T> or connector C-55, C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T>...
Page 108 13B-108 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Using scan tool MB991502, check data list item 14: Throttle Position Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 109 13B-109 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0123: Throttle Position Sensor Circuit High Input Throttle Position Sensor (TPS) Circuit B-07 (MU802724) THROTTLE POSITION 2 3 4 SENSOR AUTO-CRUISE CONTROL SYSTEM <M/T>*1 <M/T>*2 <M/T>*1 <A/T>*3 <A/T>*4 <A/T>*3 ENGINE CONTROL MODULE (ECM) <M/T>...
Page 110 13B-110 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CIRCUIT OPERATION DTC SET CONDITIONS • A 5-volt power supply is applied on the TPS Check Conditions power terminal (terminal 4) from the ECM (termi- • 2 seconds or more have passed since the start- nal 42) <M/T>...
Page 111 13B-111 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check connector B-07 at throttle position sensor for damage. Q: Is the connector in good condition? CONNECTOR : B-07 YES : Go to Step 3. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 112 13B-112 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check for open circuit and harness damage between throttle position sensor connector B-07 terminal 1 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-07 YES : Replace the ECM or PCM.
Page 113 13B-113 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Using scan tool MB991502, check data list item 14: Throttle Position Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 114 13B-114 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control Engine Coolant Temperature Sensor Circuit B-11 (MU802406) ENGINE COOLANT TEMPERATURE SENSOR 49 <M/T> C-58 <M/T> 57 <A/T> (MU803782) 46 47 58 59 ENGINE CONTROL 60 61...
Page 115 13B-115 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Check Conditions, Judgement Criteria TECHNICAL DESCRIPTION • About 60 − 300 seconds have passed for the • The engine coolant temperature sensor converts engine coolant temperature to rise to about 7°C the engine coolant temperature to a voltage and (45°F) after starting sequence was completed.
Page 116 13B-116 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the sensor output voltage at engine coolant temperature sensor connector B-11 by backprobing. (1) Do not disconnect the connector B-11. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 1 and ground by B-11 CONNECTOR backprobing.
Page 117 13B-117 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list item 21: Engine Coolant Temperature Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 118 13B-118 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Replace the ECM or PCM. Then go to Step 14. NO : Repair or replace it.
Page 119 13B-119 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between engine coolant temperature sensor connector B-11 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-11 ENGINE...
Page 120 13B-120 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the engine coolant temperature sensor. (1) Disconnect the engine coolant temperature sensor CONNECTOR : B-11 ENGINE connector B-11. COOLANT (2) Remove the engine coolant temperature sensor. TEMPERATURE SENSOR ACX02490...
Page 121 13B-121 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check for harness damage between engine coolant temperature sensor connector B-11 terminal 1 and ECM connector C-58 terminal 44 <M/T> or PCM connector C-55 terminal 44 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-11 ENGINE...
Page 122 13B-122 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING HINTS (The most likely • ECM <M/T> failed. • PCM <A/T> failed. causes for this code to be set are:) • The thermostat is faulty DIAGNOSIS STEP 1. Check the cooling system. Refer to GROUP 14, Engine Cooling Diagnosis P.14-3.
Page 123 13B-123 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> RIGHT BANK HEATED OXYGEN ECM<M/T> PCM<A/T> SENSOR (FRONT) C-55 C-62 C-59 C-58 ACX02481AH ACX02481 AK000225 CONNECTOR: B-27 AK103507 AK103507AB DTC SET CONDITIONS CIRCUIT OPERATION •...
Page 124 13B-124 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tools: • MB991502: Scan Tool (MUT-II) • MD998464: Test Harness STEP 1. Using scan tool MB991502, check data list item 39: Heated Oxygen Sensor Bank 1, Sensor 1 (right front). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 125 13B-125 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the sensor output voltage at ECM connector C-62 <M/T> or PCM connector C-59 <A/T> by backprobing. (1) Do not disconnect the connector C-62 <M/T> or C-59 <A/ T>.
Page 126 13B-126 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector B-27 at right bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-27 YES : Go to Step 5.
Page 127 13B-127 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector B-27 at right bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-27 YES : Repair harness wire between right bank heated oxygen sensor (front) connector B-27 terminal 4 and...
Page 128 13B-128 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the continuity at right bank heated oxygen sensor (front) harness side connector B-27. (1) Disconnect the connector B-27 and measure at the harness side. (2) Check for the continuity between terminal 2 and ground. •...
Page 129 13B-129 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit and harness damage between right bank heated oxygen sensor (front) connector B-27 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/ T>.
Page 130 13B-130 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between right bank heated oxygen sensor (front) connector B-27 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-27 YES : Go to Step 13.
Page 131 13B-131 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check the right bank heated oxygen sensor (front). (1) Disconnect the right bank heated oxygen sensor (front) connector B-27 and connect test harness special tool, RIGHT BANK MD998464, to the connector on the right bank heated HEATED OXYGEN oxygen sensor (front) side.
Page 132 13B-132 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0131: Heated Oxygen Sensor Circuit Low Voltag (bank 1, sensor 1) Right Bank Heated Oxygen Sensor (front) Circuit B-27 MU802605 RIGHT BANK HEATED OXYGEN SENSOR (FRONT) FROM MFI RELAY TO ECM OR PCM S142...
Page 133 13B-133 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 • Right bank heated oxygen sensor (front) signal CIRCUIT OPERATION voltage has continued to be 0.2 volt or lower. •...
Page 134 13B-134 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 39: Heated Oxygen Sensor Bank 1, Sensor 1 (right front). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 135 13B-135 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the right bank heated oxygen sensor (front). (1) Disconnect the right bank heated oxygen sensor (front) connector B-27 and connect test harness special tool, RIGHT BANK MD998464, to the connector on the right bank heated HEATED OXYGEN oxygen sensor (front) side.
Page 136 13B-136 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-27 at right bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-27 YES : Go to Step 4.
Page 137 13B-137 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0131 is output? YES : Retry the troubleshooting.
Page 138 13B-138 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> RIGHT BANK HEATED OXYGEN ECM<M/T> PCM<A/T> SENSOR (FRONT) C-55 C-62 C-59 C-58 ACX02481AH ACX02481 AK000225 CONNECTOR: B-27 AK103507 AK103507AB • The ECM <M/T> or PCM <A/T> forcibly varies CIRCUIT OPERATION the air/fuel mixture to make it leaner and richer, •...
Page 139 13B-139 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check connector B-27 at right bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-27 YES : Go to Step 2.
Page 140 13B-140 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0132 is output? YES : Retry the troubleshooting.
Page 141 13B-141 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> RIGHT BANK HEATED OXYGEN ECM<M/T> PCM<A/T> SENSOR (FRONT) C-55 C-62 C-59 C-58 ACX02481AH ACX02481 AK000225 CONNECTOR: B-27 AK103507 AK103507AB • Engine speed is at between 1,250 and 3,000 r/ CIRCUIT OPERATION min.
Page 142 13B-142 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING HINTS (The most likely • ECM failed. <M/T> • PCM failed. <A/T> causes for this code to be set are: ) • Right bank heated oxygen sensor (front) deterio- rated.
Page 143 13B-143 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0134: Heated Oxygen Sensor Circuit No Activity Detected (bank 1, sensor 1) • Volumetric efficiency is at between 30 and 95 HEATED OXYGEN SENSOR CIRCUIT NO percent. ACTIVITY DETECTED (BANK 1, SENSOR 1) •...
Page 144 13B-144 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 69: Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 145 13B-145 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the right bank heated oxygen sensor (front). (1) Disconnect the right bank heated oxygen sensor (front) connector B-27 and connect test harness special tool, RIGHT BANK MD998464 to the connector on the right bank heated HEATED OXYGEN oxygen sensor (front) side.
Page 146 13B-146 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the right bank injector resistance at intermediate connector B-48. (1) Disconnect the injector intermediate connector B-48. CONNECTOR:B-48 AK000209AC (2) Measure the resistance between each injector side connector terminal.
Page 147 13B-147 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check the right bank injector. (1) Check the right bank injector connector, which deviates CONNECTORS : B-01, B-05, B-26 from the standard value at Step 7. B-05 B-26 B-01 AK000210AB (2) Measure the resistance between injector side connector...
Page 148 13B-148 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check for harness damage between right bank heated oxygen sensor (front) connector B-27 terminal 4 and ECM connector C-62 terminal 72 <M/T> or PCM connector C-59 terminal 72 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-27 YES : Go to Step 12.
Page 149 13B-149 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check the fuel pressure. Refer to P.13B-680, Fuel Pressure Test. Q: Is the fuel pressure normal? YES : Replace the ECM or PCM. Then go to Step 14. NO : Repair it.
Page 150 13B-150 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: A-18X RIGHT BANK MFI RELAY HEATED OXYGEN SENSOR (FRONT) ACX02481AH ACX02481 AK101363AB CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: B-27 PCM<A/T> ECM<M/T> C-52 C-51 AK103507 AK103507AB AK000225 • Engine coolant temperature is higher than 20°C CIRCUIT OPERATION (68°F).
Page 151 13B-151 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check connector B-27at the right bank heated oxygen sensor (front) for damage. Q: Is the connector in good condition? CONNECTOR: B-27 YES : Go to Step 2. NO : Repair or replace it.
Page 152 13B-152 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the power supply voltage at right bank heated oxygen sensor (front) harness side connector B-27. (1) Disconnect the connector B-27 and measure at the harness side. (2) Turn the ignition switch to the "ON"...
Page 153 13B-153 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 7. NO : Repair or replace it.
Page 154 13B-154 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for harness damage between MFI relay connector A-18X terminal 4 and right bank heated oxygen sensor (front) connector B-27 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 10.
Page 155 13B-155 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the trouble symptoms. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0135 is output? YES : Replace the ECM or PCM.
Page 156 13B-156 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0136: Heated Oxygen Sensor Circuit (bank 1, sensor 2) Right Bank Heated Oxygen Sensor (rear) Circuit RIGHT BANK HEATED OXYGEN SENSOR (REAR) B-28 MU802665 FROM MFI RELAY TO ECM OR PCM S142 C-62 <M/T>...
Page 157 13B-157 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 • Right bank heated oxygen sensor (rear) signal CIRCUIT OPERATION voltage has continued to be 0.15 volt or lower. •...
Page 158 13B-158 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 69: Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 159 13B-159 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the sensor output voltage at ECM connector C-62 <M/T> or PCM connector C-59 <A/T> by backprobing. (1) Do not disconnect the connector C-62 <M/T> or C-59 <A/ T>.
Page 160 13B-160 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector B-28 at right bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-28 YES : Go to Step 5.
Page 161 13B-161 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector B-28 at right bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-28 YES : Repair harness wire between right bank heated oxygen sensor (rear) connector B-28 terminal 4 and...
Page 162 13B-162 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the continuity at right bank heated oxygen sensor (rear) harness side connector B-28. (1) Disconnect the connector B-28 and measure at the harness side. (2) Check for the continuity between terminal 2 and ground. •...
Page 163 13B-163 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit and harness damage between right bank heated oxygen sensor (rear) connector B-28 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-28 YES : Replace the ECM or PCM.
Page 164 13B-164 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between right bank heated oxygen sensor (rear) connector B-28 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-28 YES : Go to Step 13.
Page 165 13B-165 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check the right bank heated oxygen sensor (rear). (1) Disconnect the right bank heated oxygen sensor (rear) connector B-28 and connect test harness special tool, RIGHT BANK HEATED OXYGEN MB991316, to the connector on the right bank heated SENSOR (REAR)
Page 166 13B-166 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0137: Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 2) Right Bank Heated Oxygen Sensor (rear) Circuit RIGHT BANK HEATED OXYGEN SENSOR (REAR) B-28 MU802665 FROM MFI RELAY TO ECM OR PCM S142...
Page 167 13B-167 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 • Volumetric efficiency is higher than 25 percent. CIRCUIT OPERATION • Volume air flow sensor output frequency is 75 Hz •...
Page 168 13B-168 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 69: Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 169 13B-169 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the right bank heated oxygen sensor (rear). (1) Disconnect the right bank heated oxygen sensor (rear) connector B-28 and connect test harness special tool, RIGHT BANK HEATED OXYGEN MB991316, to the connector on the right bank heated SENSOR (REAR)
Page 170 13B-170 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-28 at right bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-28 YES : Go to Step 4.
Page 171 13B-171 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0137 is output? YES : Retry the troubleshooting.
Page 172 13B-172 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, RIGHT BANK C-55, C-59<A/T> HEATED OXYGEN ECM<M/T> PCM<A/T> SENSOR (REAR) C-55 C-62 C-59 C-58 ACX02493 AJ AK000225 CONNECTOR: B-28 AK103508 AK103508AB CIRCUIT OPERATION DTC SET CONDITIONS •...
Page 173 13B-173 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check connector B-28 at right bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-28 YES : Go to Step 2.
Page 174 13B-174 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0138 is output? YES : Retry the troubleshooting.
Page 175 13B-175 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, RIGHT BANK C-55, C-59<A/T> HEATED OXYGEN ECM<M/T> PCM<A/T> SENSOR (REAR) C-55 C-62 C-59 C-58 ACX02493 AJ AK000225 CONNECTOR: B-28 AK103508 AK103508AB • Repeat 3 or more times: drive , stop CIRCUIT OPERATION •...
Page 176 13B-176 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 69: Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 177 13B-177 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0141: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 2) Right Bank Heated Oxygen Sensor (rear) Heater Circuit BATTERY RIGHT BANK HEATED OXYGEN SENSOR (REAR) B-28 A-18X MU802665 RELAY TO ECM TO ECM...
Page 178 13B-178 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: A-18X MFI RELAY ECM<M/T> PCM<A/T> C-52 C-51 AK101363AB AK000225 • Engine coolant temperature is higher than 20°C CIRCUIT OPERATION (68°F). • Power is supplied from the MFI relay (terminal 4) •...
Page 179 13B-179 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the right bank heated oxygen sensor (rear). (1) Disconnect right bank heated oxygen sensor (rear) connector B-28 and connect test harness special tool, RIGHT BANK HEATED OXYGEN MB991316, to the connector on the right bank heated SENSOR (REAR) oxygen (rear) sensor side.
Page 180 13B-180 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check harness connector A-18X at the MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and right bank heated oxygen sensor (rear) connector B-28 terminal 1 because of open...
Page 181 13B-181 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for open circuit or short circuit to ground between right bank heated oxygen sensor (rear) connector B-28 terminal 3 and ECM connector C-51 terminal 27 <M/T> or PCM connector C-52 terminal 27 <A/T>.
Page 182 13B-182 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for harness damage between MFI relay connector A-18X terminal 4 and right bank heated oxygen sensor (rear) connector B-28 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 10.
Page 183 13B-183 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the trouble symptoms. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0141 is output? YES : Replace the ECM or PCM.
Page 184 13B-184 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0150: Heated Oxygen Sensor Circuit (bank 2, sensor 1) Left Bank Heated Oxygen Sensor (front) Circuit B-24 MU802605 LEFT BANK HEATED OXYGEN SENSOR (FRONT) FROM MFI RELAY TO ECM OR PCM 49 <M/T>*1 71 <M/T>*2...
Page 185 13B-185 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 DTC SET CONDITIONS CIRCUIT OPERATION • A voltage corresponding to the oxygen concen- Check Conditions tration in the exhaust gas is sent to the ECM (ter- •...
Page 186 13B-186 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 11: Heated Oxygen Sensor Bank 2, Sensor 1 (left front). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 187 13B-187 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the sensor output voltage at ECM connector C-62 <M/T> or PCM connector C-59 <A/T> by backprobing. (1) Do not disconnect the connector C-62 <M/T> or C-59 <A/ T>.
Page 188 13B-188 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector B-24 at left bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-24 YES : Go to Step 5.
Page 189 13B-189 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector B-24 at left bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-24 YES : Repair harness wire between left bank heated oxygen sensor (front) connector B-24 terminal 4 and ECM...
Page 190 13B-190 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the continuity at left bank heated oxygen sensor (front) harness side connector B-24. (1) Disconnect the connector B-24 and measure at the harness side. (2) Check for the continuity between terminal 2 and ground. •...
Page 191 13B-191 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit and harness damage between left bank heated oxygen sensor (front) connector B-24 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-24 YES : Replace the ECM or PCM.
Page 192 13B-192 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between left bank heated oxygen sensor (front) connector B-24 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-24 YES : Go to Step 13.
Page 193 13B-193 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check the left bank heated oxygen sensor (front). (1) Disconnect the left bank heated oxygen sensor (front) connector B-24 and connect test harness special tool, LEFT BANK MD998464, to the connector on the left bank heated oxygen HEATED OXYGEN sensor (front) side.
Page 194 13B-194 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0151: Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 1) Left Bank Heated Oxygen Sensor (front) Circuit B-24 MU802605 LEFT BANK HEATED OXYGEN SENSOR (FRONT) FROM MFI RELAY TO ECM OR PCM 49 <M/T>*1...
Page 195 13B-195 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 • Left bank heated oxygen sensor (front) signal CIRCUIT OPERATION voltage has continued to be 0.2 volt or lower. •...
Page 196 13B-196 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 11: Heated Oxygen Sensor Bank 2, Sensor 1 (left front). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 197 13B-197 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the left bank heated oxygen sensor (front). (1) Disconnect the left bank heated oxygen sensor (front) connector B-24 and connect test harness special tool, LEFT BANK MD998464, to the connector on the left bank heated oxygen HEATED OXYGEN sensor (front) side.
Page 198 13B-198 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-24 at left bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-24 YES : Go to Step 4.
Page 199 13B-199 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0151 is output? YES : Retry the troubleshooting.
Page 200 13B-200 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: B-24 LEFT BANK HEATED OXYGEN SENSOR (FRONT) AK103509AB ACX02489 CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-58 C-62 C-59 AK000225 • The ECM <M/T> or PCM <A/T> varies the air/fuel CIRCUIT OPERATION mixture to make it leaner and richer, and checks •...
Page 201 13B-201 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check connector B-24 at left bank heated oxygen sensor (front) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-24 YES : Go to Step 2.
Page 202 13B-202 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0152 is output? YES : Retry the troubleshooting.
Page 203 13B-203 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: B-24 LEFT BANK HEATED OXYGEN SENSOR (FRONT) AK103509AB ACX02489 CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-58 C-62 C-59 AK000225 • Engine speed is at between 1,250 and 3,000 r/ CIRCUIT OPERATION min.
Page 204 13B-204 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING HINTS (The most likely • ECM failed. <M/T> • PCM failed. <A/T> causes for this code to be set are: ) • Left bank heated oxygen sensor (front) deterio- rated.
Page 205 13B-205 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0154: Heated Oxygen Sensor No Activity Detected (bank 2, sensor 1) • Throttle position sensor output voltage is lower HEATED OXYGEN SENSOR CIRCUIT NO then 4 volts. ACTIVITY DETECTED (bank 2, sensor 1) CIRCUIT •...
Page 206 13B-206 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 59: Heated Oxygen Sensor Bank 2, Sensor 2 (left rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 207 13B-207 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the left bank heated oxygen sensor (front). (1) Disconnect the left bank heated oxygen sensor (front) connector B-24 and connect test harness special tool LEFT BANK MD998464 to the connector on the left bank heated oxygen HEATED OXYGEN sensor (front) side.
Page 208 13B-208 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the left bank injector. (1) Disconnect the left bank injector connector B-02, B-06, B- CONNECTORS : B-02, B-06, B-25 B-02 B-06 B-25 AK000213AB (2) Measure the resistance between each injector side connector terminal 1 and 2.
Page 209 13B-209 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for harness damage between left bank heated oxygen sensor (front) connector B-24 terminal 4 and ECM connector C-62 terminal 71 <M/T> or PCM connector C-59 terminal 71 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-24 YES : Go to Step 10.
Page 210 13B-210 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the fuel pressure. Refer to Fuel Pressure Test P.13B-680. Q: Is the fuel pressure normal? YES : Replace the ECM or PCM. Then go to Step 12. NO : Repair or replace it.
Page 211 13B-211 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0155: Heated Oxygen Sensor Heater Circuit (bank 2, sensor 1) Left Bank Heated Oxygen Sensor (front) Heater Circuit BATTERY LEFT BANK HEATED OXYGEN SENSOR (FRONT) B-24 A-18X MU802605 RELAY TO ECM TO ECM...
Page 212 13B-212 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: A-18X MFI RELAY ECM<M/T> PCM<A/T> C-52 C-51 AK101363AB AK000225 • Engine coolant temperature is higher than 20°C CIRCUIT OPERATION (68°F). • Power is supplied from the MFI relay (terminal 4) •...
Page 213 13B-213 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the left bank heated oxygen sensor (front). (1) Disconnect left bank heated oxygen sensor (front) connector B-24 and connect test harness special tool, LEFT BANK MD998464, to the connector on the left bank heated oxygen HEATED OXYGEN (front) sensor side.
Page 214 13B-214 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector A-18X at the MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and left bank heated oxygen sensor (front) connector B-24 terminal 1 because of open...
Page 215 13B-215 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for open circuit or short circuit to ground between left bank heated oxygen sensor (front) connector B-24 terminal 3 and ECM connector C-51 terminal 3 <M/T> or PCM connector C-52 terminal 3 <A/T>.
Page 216 13B-216 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for harness damage between MFI relay connector A-18X terminal 4 and left bank heated oxygen sensor (front) connector B-24 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 10.
Page 217 13B-217 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the trouble symptoms. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0155 is output? YES : Replace the ECM or PCM.
Page 218 13B-218 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0156: Heated Oxygen Sensor Circuit (bank 2, sensor 2) Left Bank Heated Oxygen Sensor (rear) Circuit LEFT BANK HEATED OXYGEN SENSOR (REAR) B-23 MU802665 FROM MFI RELAY TO ECM OR PCM C-58 <M/T>...
Page 219 13B-219 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 • Left bank heated oxygen sensor (rear) signal volt- CIRCUIT OPERATION age has continued to be 0.15 volt or lower. •...
Page 220 13B-220 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 59: Heated Oxygen Sensor Bank 2, Sensor 2 (left rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 221 13B-221 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the sensor output voltage at ECM connector C-62 <M/T> or PCM connector C-59 <A/T> by backprobing. (1) Do not disconnect the connector C-62 <M/T> or C-59 <A/ T>.
Page 222 13B-222 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector B-23 at left bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-23 YES : Go to Step 5.
Page 223 13B-223 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector B-23 at left bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-23 YES : Repair harness wire between left bank heated oxygen sensor (rear) connector B-23 terminal 4 and ECM...
Page 224 13B-224 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the continuity at left bank heated oxygen sensor (rear) harness side connector B-23. (1) Disconnect the connector B-23 and measure at the harness side. (2) Check for the continuity between terminal 2 and ground. •...
Page 225 13B-225 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit and harness damage between left bank heated oxygen sensor (rear) connector B-23 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-23 YES : Replace the ECM or PCM.
Page 226 13B-226 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between left bank heated oxygen sensor (rear) connector B-23 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-23 YES : Go to Step 13.
Page 227 13B-227 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check the left bank heated oxygen sensor (rear). (1) Disconnect the left bank heated oxygen sensor (rear) connector B-23 and connect test harness special tool, MB991316, to the connector on the left bank heated oxygen sensor (front) side.
Page 228 13B-228 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0157: Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 2) Left Bank Heated Oxygen Sensor (rear) Circuit LEFT BANK HEATED OXYGEN SENSOR (REAR) B-23 MU802665 FROM MFI RELAY TO ECM OR PCM C-58 <M/T>...
Page 229 13B-229 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK000225 • Volumetric efficiency is higher than 25 percent. CIRCUIT OPERATION • Volume air flow sensor output frequency is 75 Hz •...
Page 230 13B-230 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 59: Heated Oxygen Sensor Bank 2, Sensor 2 (left rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 231 13B-231 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the left bank heated oxygen sensor (rear). (1) Disconnect the left bank heated oxygen sensor (rear) connector B-23 and connect test harness special tool, MB991316, to the connector on the left bank heated oxygen sensor (front) side.
Page 232 13B-232 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-23 at left bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-23 YES : Go to Step 4.
Page 233 13B-233 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0157 is output? YES : Retry the troubleshooting.
Page 234 13B-234 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> LEFT BANK HEATED OXYGEN SENSOR (REAR) C-55 C-62 C-59 C-58 ACX02488 AK000225 CONNECTOR: B-23 AK103510AB CIRCUIT OPERATION DTC SET CONDITIONS • A voltage corresponding to the oxygen concen- Check Conditions tration in the exhaust gas is sent to the ECM (ter- •...
Page 235 13B-235 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check connector B-23 at left bank heated oxygen sensor (rear) and connector C-62 at ECM <M/T> or connector C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR: B-23 YES : Go to Step 2.
Page 236 13B-236 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0158 is output? YES : Retry the troubleshooting.
Page 237 13B-237 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, C-55, C-59<A/T> ECM<M/T> PCM<A/T> LEFT BANK HEATED OXYGEN SENSOR (REAR) C-55 C-62 C-59 C-58 ACX02488 AK000225 CONNECTOR: B-23 AK103510AB • Repeat 3 or more times: drive , stop CIRCUIT OPERATION •...
Page 238 13B-238 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 59: Heated Oxygen Sensor Bank 2, Sensor 2 (left rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 239 13B-239 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0161: Heated Oxygen Sensor Heater Circuit (bank 2, sensor 2) Left Bank Heated Oxygen Sensor (rear) Heater Circuit BATTERY LEFT BANK HEATED OXYGEN SENSOR (REAR) A-18X B-23 MU802665 RELAY TO ECM TO ECM...
Page 240 13B-240 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: A-18X MFI RELAY ECM<M/T> PCM<A/T> C-52 C-51 AK101363AB AK000225 • Engine coolant temperature is higher than 20°C CIRCUIT OPERATION (68°F). • Power is supplied from the MFI relay (terminal 4) •...
Page 241 13B-241 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the left bank heated oxygen sensor (rear). (1) Disconnect left bank heated oxygen sensor (rear) connector B-23 and connect test harness special tool, MB991316, to the connector on the left bank heated oxygen (rear) sensor side.
Page 242 13B-242 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector A-18X at the MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and left bank heated oxygen sensor (rear) connector B-23 terminal 1 because of open...
Page 243 13B-243 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for open circuit or short circuit to ground between left bank heated oxygen sensor (rear) connector B-23 terminal 3 and ECM connector C-51 terminal 26 <M/T> or PCM connector C-52 terminal 26 <A/T>.
Page 244 13B-244 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for harness damage between MFI relay connector A-18X terminal 4 and left bank heated oxygen sensor (rear) connector B-23 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 10.
Page 245 13B-245 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the trouble symptoms. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0161 is output? YES : Replace the ECM or PCM.
Page 246 13B-246 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Volume air flow sensor output frequency is 75 Hz Check Area • Engine coolant temperature is higher than 77°C or more. (171°F). Judgment Criteria • Under the closed loop air/fuel ratio control. •...
Page 247 13B-247 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list item 12: Volume Air Flow Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 248 13B-248 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Using scan tool MB991502, check data list item 21: Engine Coolant Temperature Sensor. (1) Turn the ignition switch to the "ON" position. (2) Set scan tool MB991502 to the data reading mode for item 21, Engine Coolant Temperature Sensor.
Page 249 13B-249 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the right bank injector resistance at intermediate connector B-48. (1) Disconnect the injector intermediate connector B-48. CONNECTOR:B-48 AK000209AC (2) Measure the resistance between each male connector side connector terminal.
Page 250 13B-250 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the right bank injector. (1) Disconnect the right bank injector connector, which CONNECTORS : B-01, B-05, B-26 deviates from the standard value at Step 8. B-05 B-26 B-01 AK000210AB (2) Measure the resistance between injector side connector...
Page 251 13B-251 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between right bank injector connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between injector connector B-01 CONNECTORS : B-01, B-05, B-26 terminal 2 and ECM connector C-51 terminal 1 <M/T>...
Page 252 13B-252 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 16. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 2 − Fuel Trim Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0171 is output? YES : Retry the troubleshooting.
Page 253 13B-253 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 12: Volume Air Flow Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 254 13B-254 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list item 21: Engine Coolant Temperature Sensor. (1) Turn the ignition switch to the "ON" position. (2) Set scan tool MB991502 to the data reading mode for item 21, Engine Coolant Temperature Sensor.
Page 255 13B-255 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the right bank injector resistance at intermediate connector B-48. (1) Disconnect the injector intermediate connector B-48. CONNECTOR:B-48 AK000209AC (2) Measure the resistance between each male connector side connector terminal.
Page 256 13B-256 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the fuel pressure. Refer to Fuel Pressure Test P.13B-680. Q: Is the fuel pressure normal? YES : Go to Step 9. NO : Repair or replace it. Then go to Step 10. STEP 9.
Page 257 13B-257 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Engine coolant temperature is higher than 77°C • Engine coolant temperature is higher than 77°C (171°F). (171°F). • Volume air flow sensor output frequency is 75 Hz • Volume air flow sensor output frequency is 75 Hz or less.
Page 258 13B-258 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list item 12: Volume Air Flow Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 259 13B-259 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Using scan tool MB991502, check data list item 21: Engine Coolant Temperature Sensor. (1) Turn the ignition switch to the "ON" position. (2) Set scan tool MB991502 to the data reading mode for item 21, Engine Coolant Temperature Sensor.
Page 260 13B-260 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the left bank injector. (1) Disconnect the left bank injector connector B-02, B-06, B- CONNECTORS : B-02, B-06, B-25 B-02 B-06 B-25 AK000213AB (2) Measure the resistance between each injector side connector terminal 1 and 2.
Page 261 13B-261 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between left bank injector connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between injector connector B-02 CONNECTORS : B-02, B-06, B-25 terminal 2 and ECM connector C-51 terminal 9 <M/T>...
Page 262 13B-262 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 2 − Fuel Trim Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0174 is output? YES : Retry the troubleshooting.
Page 263 13B-263 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 12: Volume Air Flow Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 264 13B-264 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list item 21: Engine Coolant Temperature Sensor. (1) Turn the ignition switch to the "ON" position. (2) Set scan tool MB991502 to the data reading mode for item 21, Engine Coolant Temperature Sensor.
Page 265 13B-265 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the left bank injector. (1) Disconnect the left bank injector connector B-02, B-06, B- CONNECTORS : B-02, B-06, B-25 B-02 B-06 B-25 AK000213AB (2) Measure the resistance between each injector side connector terminal 1 and 2.
Page 266 13B-266 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0181: Fuel Temperature Sensor Circuit Range/Performance Fuel Temperature Sensor Circuit C-62 <M/T> (MU803783) 76 77 ENGINE CONTROL MODULE (ECM) <M/T> POWERTRAIN CONTROL C-55 <A/T> MODULE (PCM) <A/T> (MU803781) 42 43 96 <M/T>...
Page 267 13B-267 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:D-17 CONNECTOR:C-90 AK000734AC AK000345 • Engine coolant temperature is higher than 60°C CIRCUIT OPERATION (140°F). • 5-volt voltage is applied to the fuel temperature • Maximum vehicle speed is higher than 30 km/h sensor output terminal (terminal 3) from the ECM (17 mph) after the starting sequence has been (terminal 96) <M/T>...
Page 268 13B-268 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 4A: Fuel Temperature Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 269 13B-269 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the continuity at fuel temperature sensor harness side connector D-17. (1) Disconnect the connector D-17 and measure at the harness side. (2) Check for the continuity between terminal 1 and ground. D-17 HARNESS •...
Page 270 13B-270 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the sensor supply voltage at ECM connector C-62 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-62 <M/T> or PCM connector C-55 <A/T>.
Page 271 13B-271 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check connector C-62 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTORS : C-62<M/T>, C-55<A/T> YES : Go to Step 9. NO : Repair or replace it.
Page 272 13B-272 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check for harness damage between fuel temperature sensor connector D-17 terminal 3 and ECM connector C-62 terminal 96 <M/T> or PCM connector C-55 terminal 51 <A/T>. NOTE: Check harness after checking intermediate connector CONNECTOR:D-17 C-28 and C-90.
Page 273 13B-273 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0182: Fuel Temperature Sensor Circuit Low Input Fuel Temperature Sensor Circuit C-62 <M/T> (MU803783) 76 77 ENGINE CONTROL MODULE (ECM) <M/T> POWERTRAIN CONTROL C-55 <A/T> MODULE (PCM) <A/T> (MU803781) 42 43 96 <M/T>...
Page 274 13B-274 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:D-17 CONNECTOR:C-90 AK000734AC AK000345 CIRCUIT OPERATION DTC SET CONDITIONS • 5-volt voltage is applied to the fuel temperature Check Conditions sensor output terminal (terminal 3) from the ECM • 2 seconds or more have passed since the start- (terminal 96) <M/T>...
Page 275 13B-275 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the fuel temperature sensor. (1) Disconnect the fuel temperature sensor connector D-17 (2) Measure the resistance between terminal 1 and 3 of the fuel FUEL TEMPERATURE SENSOR temperature sensor.
Page 276 13B-276 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check for short circuit to ground between fuel temperature sensor connector D-17 and ECM connector C- 62 <M/T> or PCM connector C-55 <A/T>. NOTE: Check harness after checking intermediate connector CONNECTOR:D-17 C-28 and C-90.
Page 277 13B-277 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0183: Fuel Temperature Sensor Circuit High Input Fuel Temperature Sensor Circuit C-62 <M/T> (MU803783) 76 77 ENGINE CONTROL MODULE (ECM) <M/T> POWERTRAIN CONTROL C-55 <A/T> MODULE (PCM) <A/T> (MU803781) 42 43 96 <M/T>...
Page 278 13B-278 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:D-17 CONNECTOR:C-90 AK000734AC AK000345 CIRCUIT OPERATION DTC SET CONDITIONS • 5-volt voltage is applied to the fuel temperature Check Conditions sensor output terminal (terminal 3) from the ECM • 2 seconds or more have passed since the start- (terminal 96) <M/T>...
Page 279 13B-279 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check connector D-17 at the fuel temperature sensor for damage. Q: Is the connector in good condition? CONNECTOR:D-17 YES : Go to Step 3. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 280 13B-280 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the sensor supply voltage at ECM connector C-62 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-62 <M/T> or PCM connector C-55 <A/T>.
Page 281 13B-281 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-62 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTORS : C-62<M/T>, C-55<A/T> YES : Replace the ECM or PCM. Then go to Step 11. NO : Repair or replace it.
Page 282 13B-282 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit and harness damage between fuel temperature sensor connector D-17 and ECM connector C-62 <M/T> or PCM connector C-55. NOTE: Check harness after checking intermediate connector CONNECTOR:D-17 C-28 and C-90.
Page 283 13B-283 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0201: Injector Circuit Malfunction - Cylinder 1, DTC P0203: Injector Circuit Malfunction - Cylinder 3, DTC P0205: Injector Circuit Malfunction - Cylinder 5 Injector Circuit - Cylinder 1, 3, 5 BATTERY A-18X RELAY...
Page 284 13B-284 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : B-01, B-05, B-26 CONNECTOR:B-48 B-05 B-26 B-01 AK000210AB AK000209AC CONNECTOR: A-18X CONNECTOR : C-51<M/T>, C-52<A/T> MFI RELAY PCM<A/T> ECM<M/T> C-52 C-51 AK101363AB AK000225 DTC SET CONDITIONS CIRCUIT OPERATION •...
Page 285 13B-285 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check actuator test item 01, 03, 05: Injectors. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 286 13B-286 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the injector resistance at injector intermediate connector B-48. (1) Disconnect the injector intermediate connector B-48. CONNECTOR:B-48 AK000209AC (2) Measure the resistance between each male connector side terminal.
Page 287 13B-287 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the injector. (1) Disconnect the injector connector B-01 <No. 1 cylinder> or CONNECTORS : B-01, B-05, B-26 B-05 <No. 3 cylinder> or B-26 <No. 5 cylinder>. B-05 B-26 B-01 AK000210AB...
Page 288 13B-288 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the power supply voltage at injector intermediate connector B-48. (1) Disconnect the connector B-48 and measure at the female connector side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 1 and ground.
Page 289 13B-289 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check for harness damage between MFI relay connector A-18X terminal 4 and injector intermediate connector B-48 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 9.
Page 290 13B-290 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for open circuit and short circuit to ground and harness damage between injector intermediate connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between intermediate connector B- CONNECTOR:B-48 48 terminal 2 and ECM connector C-51 terminal 1 <M/T>...
Page 291 13B-291 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Using the oscilloscope, check the injector. (1) Disconnect the injector intermediate connector B-48 and connect the test harness special tool (MD998464) inbetween. (2) Connect the oscilloscope probe to each injector OSCILLOSCOPE intermediate connector terminal to oscilloscope each INJECTOR INTERMEDIATE...
Page 292 13B-292 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0202: Injector Circuit Malfunction - Cylinder 2, DTC P0204: Injector Circuit Malfunction - Cylinder 4, DTC P0206: Injector Circuit Malfunction - Cylinder 6 Injector Circuit - Cylinder 2, 4, 6 BATTERY A-18X RELAY...
Page 293 13B-293 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : B-02, B-06, B-25 CONNECTOR: A-18X MFI RELAY B-02 B-06 B-25 AK101363AB AK000213AB CONNECTOR : C-51<M/T>, C-52<A/T> PCM<A/T> ECM<M/T> C-52 C-51 AK000225 DTC SET CONDITIONS CIRCUIT OPERATION • The injector power is supplied from the MFI relay Check Area (terminal 4).
Page 294 13B-294 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check actuator test item 02, 04, 06: Injectors. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 295: Connectors
13B-295 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the injector. (1) Disconnect the injector connector B-02 <No. 2 cylinder> or CONNECTORS : B-02, B-06, B-25 B-06 <No. 4 cylinder> or B-25 <No. 6 cylinder>. B-02 B-06 B-25 AK000213AB (2) Measure the resistance between injector side connector...
Page 296 13B-296 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector A-18X at MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector MFI RELAY and injector connector because of open circuit or short circuit to ground.
Page 297: Check The Harness Wire Between Injector Connector
13B-297 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 8. NO : Repair or replace it.
Page 298 13B-298 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Using the oscilloscope, check the injector. (1) Disconnect the injector connector B-02 <No. 2 cylinder> or B-06 <No. 4 cylinder> or B-25 <No. 6 cylinder> and connect the test harness special tool (MB991348) inbetween.
Page 299 13B-299 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Barometric pressure is higher than 76 kPa (11 • Misfire has occurred in 20 or more of the last psi). • Volumetric efficiency is at between 30 and 60 1,000 revolutions (corresponding to 1.5 times the percent.
Page 300 13B-300 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Using scan tool MB991502, check data list item 81: Long-Term Fuel Compensation (trim) Bank 1. (1) Start the engine and run at idle. (2) Set scan tool MB991502 to the data reading mode for item 81, Long-Term Fuel Compensation (trim) Bank 1.
Page 301 13B-301 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the spark plugs. CAUTION Do not attempt to adjust the gap of the platinum plug. Cleaning of the platinum plug may result in damage to the platinum tips.
Page 302 13B-302 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check connector B-01, B-02, B-05, B-06, B-25, B- 26 at injector and connector B-48 at injector intermediate connector for damage. Q: Is the connector in good condition? CONNECTORS : B-01, B-02, B-05, B-06, B-25, B-26 YES : Go to Step 9.
Page 303: Connectors
13B-303 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between injector connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between injector connector B-01 CONNECTORS : B-01, B-02, B-05, B-06, terminal 2 and ECM connector C-51 terminal 1 <M/T>...
Page 304 13B-304 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Replace the injector. (1) Replace the injector. CONNECTORS : B-01, B-02, B-05, B-06, (2) Carry out a test drive with the drive cycle pattern. Refer to B-25, B-26 Procedure 6 −...
Page 305 13B-305 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING HINTS (The most likely • Injector failed. • ECM failed. <M/T> causes for this code to be set are: ) • Ignition system related part (s) failed. • PCM failed. <A/T> •...
Page 306 13B-306 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the injector. (1) Disconnect the injector connector B-01 <No. 1 cylinder>, B- CONNECTORS : B-01, B-02, B-05, B-06, 02 <No. 2 cylinder>, B-05 <No. 3 cylinder>, B-06 <No. 4 B-25, B-26 cylinder>, B-26 <No.
Page 307 13B-307 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 6. NO : Repair or replace it.
Page 308 13B-308 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Replace the injector. (1) Replace the injector. CONNECTORS : B-01, B-02, B-05, B-06, (2) Carry out a test drive with the drive cycle pattern. Refer to B-25, B-26 Procedure 6 −...
Page 309 13B-309 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0325: Knock Sensor Circuit Knock Sensor Circuit C-62 <M/T> (MU803783) 76 77 ENGINE CONTROL MODULE (ECM) POWERTRAIN CONTROL C-59 <A/T> MODULE (PCM) (MU803782) 91 <M/T> 76 77 90 <A/T> 82 83 84 85 86 87...
Page 310 13B-310 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-62<M/T>, C-59<A/T> CONNECTOR: B-35 <WITH VARIABLE INDUCTION SYSTEM> ECM<M/T> PCM<A/T> C-59 C-62 AK103513 AB AK000225 • Engine speed is higher than 3,000 r/min. CIRCUIT OPERATION • The knock sensor sends a signal voltage to the Judgment Criteria ECM (terminal 91) <M/T>...
Page 311 13B-311 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check connector B-35 at the knock sensor for damage. Q: Is the connector in good condition? CONNECTOR: B-35 <WITHOUT VARIABLE YES : Go to Step 2. INDUCTION SYSTEM> NO : Repair or replace it.
Page 312 13B-312 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check for open circuit and short circuit to ground and harness damage between knock sensor connector B- 35 terminal 1 and ECM connector C-62 terminal 91 <M/T> or PCM connector C-59 terminal 90 <A/T>.
Page 313 13B-313 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the knock sensor. (1) Disconnect the knock sensor connector B-35. (2) Start the engine and run at idle. KNOCK SENSOR AK103511 AK103511AB CONNECTOR: B-35 <WITHOUT VARIABLE INDUCTION SYSTEM>...
Page 314 13B-314 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Using scan tool MB991502, read the diagnostic trouble code(DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"(OFF) position before con- necting or disconnecting scan tool MB991502.
Page 315 13B-315 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0335: Crankshaft Position Sensor Circuit Crankshaft Position Sensor Circuit BATTERY A-18X RELAY B-20 MU802603 CRANKSHAFT POSITION SENSOR C-58 <M/T> (MU803782) 34 <M/T>*1 43 <M/T>*2 C-51 <M/T>, C-52 <A/T> 46 47 16 <A/T>*3 45 <A/T>*4...
Page 316 13B-316 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: B-20 <WITH VARIABLE CONNECTOR: A-18X INDUCTION SYSTEM> MFI RELAY AK103517 AB AK101363AB CONNECTORS:C-51,C-58<M/T> C-52,C-55<A/T> PCM<A/T> ECM<M/T> C-52 C-55 C-51 C-58 AK000225 CIRCUIT OPERATION DTC SET CONDITIONS • The crankshaft position sensor power is supplied Check Conditions from the MFI relay (terminal 4).
Page 317 13B-317 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 22: Crankshaft Position Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 318 13B-318 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-20 at the crankshaft position sensor for damage. Q: Is the connector in good condition? CONNECTOR: B-20 <WITHOUT VARIABLE YES : Go to Step 4. INDUCTION SYSTEM>...
Page 319 13B-319 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector B-20 at the crankshaft position sensor for damage. Q: Is the connector in good condition? CONNECTOR: B-20 <WITHOUT VARIABLE YES : Go to Step 6. INDUCTION SYSTEM>...
Page 320 13B-320 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the sensor supply voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 321 13B-321 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 10. NO : Repair or replace it.
Page 322 13B-322 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the power supply voltage at crankshaft position sensor harness side connector B-20. (1) Disconnect the connector B-20 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 3 and ground.
Page 323 13B-323 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 15. NO : Repair or replace it.
Page 324 13B-324 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 16. Check connector A-18X at the MFI relay for damage. Q: Is the harness connector in good condition? CONNECTOR: A-18X YES : Go to Step 17. MFI RELAY NO : Repair or replace it.
Page 325 13B-325 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 18. Check for harness damage between MFI relay connector A-18X terminal 4 and crankshaft position sensor connector B-20 terminal 3. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 19.
Page 326 13B-326 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 19. Check for harness damage between crankshaft position sensor connector B-20 terminal 2 and ECM connector C-58 terminal 43 <M/T> or PCM connector C-55 terminal 45 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-20 <WITHOUT VARIABLE YES : Go to Step 20.
Page 327 13B-327 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0340: Camshaft Position Sensor Circuit Camshaft Position Sensor Circuit BATTERY A-18X RELAY B-22 (MU802054) CAMSHAFT POSITION SENSOR (BUILT INTO DISTRIBUTOR) C-58 <M/T> (MU803782) C-51 <M/T>, C-52 <A/T> 34 <M/T>*1 50 <M/T>*2 (MU803784) 16 <A/T>*3...
Page 328 13B-328 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: A-18X MFI RELAY AK101363AB CIRCUIT OPERATION DTC SET CONDITIONS • The camshaft position sensor power is supplied Check Conditions from the MFI relay (terminal 4). • Engine speed is higher than 50 r/min. •...
Page 329 13B-329 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using the oscilloscope, check the camshaft position sensor. (1) Disconnect the camshaft position sensor connector B-22, and connect test harness special tool (MB991348) in between. (All terminals should be connected.) (2) Connect the oscilloscope probe to the camshaft position OSCILLOSCOPE CAMSHAFT POSITION...
Page 330 13B-330 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector B-22 at camshaft position sensor for damage. Q: Is the connector in good condition? CONNECTOR: B-22 YES : Go to Step 5. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 331 13B-331 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the sensor supply voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 332 13B-332 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 9. NO : Repair or replace it.
Page 333 13B-333 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the power supply voltage at camshaft position sensor connector B-22. (1) Disconnect the connector B-22 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 6 and ground.
Page 334 13B-334 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 14. NO : Repair or replace it.
Page 335 13B-335 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 15. Check connector A-18X at the MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Go to Step 16. MFI RELAY NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 336 13B-336 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 18. Check for harness damage between camshaft position sensor connector B-22 terminal 5 and ECM connector C-58 terminal 50 <M/T> or PCM connector C-55 terminal 56 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-22 YES : Go to Step 19.
Page 337 13B-337 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Intake air temperature is higher than 0°C (32°F). Judgement Criteria • Barometric pressure is higher than 76 kPa (11 • When intake manifold pressure fluctuations width psi). is lower than 2.6 kPa (0.38 psi). When the EGR •...
Page 338 13B-338 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 5 − Exhaust Gas Recirculation (EGR) System Monitor P.00E-2. (2) Check the diagnostic trouble code (DTC).
Page 339 13B-339 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: B-31 <WITHOUT VARIABLE INDUCTION SYSTEM> ECM<M/T> PCM<A/T> SOLENOID VALVE C-52 C-51 ACX02514 AK000225 CONNECTOR: B-31 <WITH VARIABLE CONNECTOR: A-18X INDUCTION SYSTEM> MFI RELAY EGR SOLENOID VALVE AC106190AD AK101363AB...
Page 340 13B-340 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check actuator test item 10: EGR solenoid. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 341 13B-341 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3 Check the EGR solenoid. (1) Disconnect the EGR solenoid connector B-31. CONNECTOR: B-31 <WITHOUT VARIABLE INDUCTION SYSTEM> SOLENOID VALVE ACX02514 CONNECTOR: B-31 <WITH VARIABLE INDUCTION SYSTEM> EGR SOLENOID VALVE AC106190AD (2) Measure the resistance between EGR solenoid side...
Page 342 13B-342 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector A-18X at MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and EGR solenoid connector B-31 terminal 1 because of open circuit or short circuit to...
Page 343 13B-343 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check for open circuit and short circuit to ground between EGR solenoid connector B-31 terminal 2 and ECM connector C-51 terminal 6 <M/T> or PCM connector C-52 terminal 6 <A/T>.
Page 344 13B-344 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between MFI relay connector A-18X terminal 4 and EGR solenoid connector B-31 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 11.
Page 345 13B-345 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check for harness damage between EGR solenoid connector B-31 terminal 2 and ECM connector C- 51 terminal 6 <M/T> or PCM connector C-52 terminal 6 <A/ T>. Q: Is the harness wire in good condition? CONNECTOR: B-31 <WITHOUT VARIABLE YES : Replace the ECM or PCM.
Page 346 13B-346 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0421: Warm Up Catalyst Efficiency Below Threshold (bank 1) • Barometric pressure is higher than 76 kPa (11 TECHNICAL DESCRIPTION psi). • The signal from the rear heated oxygen sensor •...
Page 347 13B-347 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Using scan tool MB991502, check data list item 69: Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 348 13B-348 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list item 39: Heated Oxygen Sensor Bank 1, Sensor 1 (right front). (1) Start the engine and run at idle. (2) Set scan tool MB991502 to the data reading mode for item 39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
Page 349 13B-349 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Volume air flow sensor output frequency is • The cumulative volume air flow sensor output fre- between 69 and 169 Hz. quency is higher than 4,000 Hz. • More than 3 seconds have elapsed after the Judgment Criteria abovementioned three conditions have been met.
Page 350 13B-350 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list item 11: Heated Oxygen Sensor Bank 2, Sensor 1 (left front). (1) Start the engine and run at idle. (2) Set scan tool MB991502 to the data reading mode for item 11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
Page 351 13B-351 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 3 − Catalytic Converter Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0431 is output? YES : Retry the troubleshooting.
Page 352 13B-352 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP1. Using scan tool MB991502, check actuator test item 08: Evaporative Emission Purge Solenoid. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 353 13B-353 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4 Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 1 − Evaporative Emission Control System Leak Monitor P.13B-6. (2) Read the diagnostic trouble code.
Page 354 13B-354 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS SYSTEM DIAGRAM <VEHICE WITH VARIABLE INDUCTION SYSTEM> INTAKE MANIFOLD CHECK VALVE A EVAPORATIVE EMISSION PURGE SOLENOID CHECK VALVE B FUEL TANK EVAPORATIVE EVAPORATIVE EMISSION EMISSION CANISTER VENTILATION SOLENOID AC106496 EVAPORATIVE EMISSION PURGE EVAPORATIVE EMISSION CANISTER SOLENOID <VEHICLE WITHOUT...
Page 355 13B-355 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • The ECM <M/T> or PCM <A/T> determines if • The engine coolant temperature 36°C (97°F) or there is leak in the fuel system by measuring the less when the engine is started. change of vacuum inside the fuel tank.
Page 356 13B-356 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check evaporative emission system monitor test. CAUTION • To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
Page 357 13B-357 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check evaporative emission purge solenoid for leaks. (1) Remove the battery. (2) Remove the air intake hose. (Refer to GROUP 15, Air Cleaner P.15-6.) (3) Disconnect hose C from the evaporative emission purge <VEHICLE WITHOUT VARIABLE solenoid side, and connect a hand vacuum pump to the INDUCTION SYSTEM>...
Page 358 13B-358 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check for leaks in the evaporator line hose A to hose E <Vehicle without Variable Induction System> or hose B, C, E <Vehicle with Variable Induction System>. The leakage test with a hand vacuum pump on each hose <VEHICLE WITHOUT VARIABLE from hose A to hose E <vehicle without Variable Induction...
Page 359 13B-359 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the evaporative emission ventilation solenoid using scan tool MB991502. (Actuator test item 29) CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 360 13B-360 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Pressure test for evaporator line from hose F to hose P. (1) Remove the module bracket mounting bolts, and disconnect hose G from the evaporative emission ventilation solenoid side, and plug the hoses from which the hoses have been disconnected.
Page 361 13B-361 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for leaks in the evaporator line hose F to hose H. (1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) The leakage test with a hand vacuum pump on each hose HOSE H from hose F to hose H.
Page 362 13B-362 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for leaks in the evaporator line from hose J and hose K. (1) Remove the fuel filler neck protector. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) Disconnect hose J at the liquid separator, and then connect a hand vacuum pump to the hose.
Page 363 13B-363 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the check valve A. (1) Only when you blow the check valve from the direction shown, it should pass air. (2) When you blow the check valve, air should leak from the check valve body.
Page 364 13B-364 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check for leaks in the evaporator line hose P. (1) The leakage test with a hand vacuum pump on each hose HOSE P from hose P. Q: Is the hose in good condition? YES : Go to Step 14.
Page 365 13B-365 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS (3) Plug the filler hose, feed pipe, return pipe and rollover valve nipple connected to the fuel tank. NOTE: If these items are not securely plugged here, the fuel could leak in the next step. (4) Apply pressure with the evaporative emission system pressure pump.
Page 366 13B-366 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 16. Using scan tool MB991502, check evaporative emission system monitor test. CAUTION • To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
Page 367 13B-367 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0443: Evaporative Emission Control System Purge Control Valve Circuit Evaporative Emission Purge Solenoid Circuit BATTERY A-18X RELAY B-33 MU802779 EVAPORATIVE EMISSION PURGE SOLENOID 16 <M/T> 34 <A/T> C-51 <M/T>, C-52 <A/T> (MU803784) ENGINE CONTROL MODULE (ECM) <M/T>...
Page 368 13B-368 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: A-18X MFI RELAY ECM<M/T> PCM<A/T> C-52 C-51 AK101363AB AK000225 Judgment Criteria CIRCUIT OPERATION • The evaporative emission purge solenoid coil • Power to the evaporative emission purge sole- surge voltage (battery positive voltage + 2 volts) noid power is supplied from the MFI relay (termi- is not detected for 0.2 second.
Page 369 13B-369 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check actuator test item 08: Evaporative Emission Purge Solenoid. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 370 13B-370 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the evaporative emission purge solenoid. (1) Disconnect the evaporative emission purge solenoid CONNECTOR: B-33 <WITHOUT VARIABLE connector B-33. INDUCTION SYSTEM> EVAPORATIVE EMISSION PURGE SOLENOID VALVE ACX02514 CONNECTOR: B-33 <WITH VARIABLE INDUCTION SYSTEM>...
Page 371 13B-371 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector A-18X at MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and evaporative emission purge solenoid connector B-33 terminal 2 because of open...
Page 372 13B-372 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 8. NO : Repair or replace it.
Page 373 13B-373 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connector C-51 at ECM <M/T> or connector C-52 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 10. NO : Repair or replace it.
Page 374 13B-374 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check for harness damage between evaporative emission purge solenoid connector B-33 terminal 1 and ECM connector C-51 terminal 16 <M/T> or PCM connector C-52 terminal 34 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-33 <WITHOUT VARIABLE YES : Replace the ECM or PCM.
Page 375 13B-375 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0446: Evaporative Emission Control System Vent Control Circuit Evaporative Emission Ventilation Solenoid Circuit BATTERY A-18X RELAY C-28 13 14 15 10 11 12 18 19 20 25 26 27 2122 23 24 30 31 36 37...
Page 376 13B-376 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:D-10 CONNECTOR:C-28 EVAPORATIVE EMISSION VENTILATION SOLENOID ACX02516 AK000733AC CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR:C-90 PCM<A/T> ECM<M/T> C-52 C-51 AK000225 AK000345 CONNECTOR: A-18X CONNECTOR:D-16 MFI RELAY AK101363AB AK000734 AB CIRCUIT OPERATION DTC SET CONDITIONS •...
Page 377 13B-377 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • More than 1 second has elapsed after the above TROUBLESHOOTING HINTS (The most likely mentioned conditions have been met. causes for this code to be set are:) • Evaporative emission ventilation solenoid failed. Judgment Criteria •...
Page 378 13B-378 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3 Check the evaporative emission ventilation solenoid. (1) Disconnect the evaporative emission ventilation solenoid CONNECTOR:D-10 connector D-10. EVAPORATIVE EMISSION VENTILATION SOLENOID ACX02516 (2) Measure the resistance between evaporative emission ventilation solenoid side connector terminal 1 and 2.
Page 379 13B-379 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector A-18X at MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Check connectors C-28, C-90 and D-16 at MFI RELAY intermediate connector for damage, and repair or replace as required.
Page 380 13B-380 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check for open circuit and short circuit to ground between evaporative emission ventilation solenoid connector D-10 terminal 1 and ECM connector C-51 terminal 35 <M/T> or PCM connector C-52 terminal 35 <A/ T>.
Page 381 13B-381 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between MFI relay connector A-18X terminal 4 and evaporative emission ventilation solenoid connector D-10 terminal 2. NOTE: Check harness after checking intermediate connectors CONNECTOR: A-18X C-28, C-90 and D-16.
Page 382 13B-382 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to, Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0446 is output? YES : Retry the troubleshooting.
Page 383 13B-383 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0451: Evaporative Emission Control System Pressure Sensor Range/Performance SYSTEM DIAGRAM <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> INTAKE MANIFOLD CHECK VALVE A EVAPORATIVE EMISSION PURGE SOLENOID CHECK VALVE B FUEL TANK FUEL TANK DIFFERENTIAL EVAPORATIVE PRESSURE SENSOR...
Page 384 13B-384 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Fuel Tank Differential Pressure Sensor Circuit TSB Revision...
Page 385 13B-385 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: C-28 CONNECTORS: C-58, C-62<M/T>, C-55, C-59 <A/T> ECM <M/T> PCM <A/T> C-62 C-55 <M/T> <A/T> C-58 <M/T>, C-59 <A/T> AC001741 AJ AC001689AN CONNECTOR: D-16 CONNECTOR: C-90 CONNECTOR BLOCK (LH) AC001991 AC001787AD CONNECTOR: D-18...
Page 386 13B-386 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS NOTE: If the number of the sudden pressure fluc- • ECM <M/T> or PCM <A/T> failed. tuation does not reach twenty during one engine idling, the counter will be reset to zero. If the igni- OVERVIEW OF TROUBLESHOOTING tion switch is turned off, it will be also reset to •...
Page 387 13B-387 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 73: Fuel Tank Differential Pressure Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 388 13B-388 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the output circuit voltage at intermediate connector D-16. (1) Remove the rear seat cushion. (Refer to GROUP 52, Rear Seat P.52A-20.) (2) Remove the protector. (3) Disconnect intermediate connector D-16. (4) Use special tools (MB991658 and MB991709) to connect MB991709 terminals 5, 6 and 8 between connectors of the...
Page 389 13B-389 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connectors C-28, C-90, D-16 at intermediate connector and C-62 at ECM <M/T> or C-59 at PCM <A/T> for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 5.
Page 390 13B-390 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the harness wire between ECM connector C-62 terminal 93 <M/T> or PCM connector C-59 terminal 92 <A/T> and intermediate connector D-16 terminal 5 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-62<M/T>, C-59 <A/T>...
Page 391 13B-391 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the 5-volt supply circuit voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 392 13B-392 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connectors C-28, C-90, D-16 at intermediate connector for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 10. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 393 13B-393 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the harness wire between ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T> and intermediate connector D-16 terminal 8 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-58 <M/T>, C-55 <A/T>...
Page 394 13B-394 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check connectors C-28, C-90, D-16 at intermediate connector and C-58 at ECM <M/T> or C-55 at PCM <A/T> for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 13.
Page 395 13B-395 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check the harness wire between ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T> and intermediate connector D-16 terminal 6 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-58 <M/T>, C-55 <A/T>...
Page 396 13B-396 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 15. Check connectors D-16 at intermediate connector and D-18 at fuel tank differential pressure sensor for damage. Q: Are the connectors in good condition? CONNECTOR: D-16 YES : Go to Step 16. NO : Repair or replace it.
Page 397 13B-397 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 17. Check the harness wire between intermediate connector D-16 terminal 6 and fuel tank differential pressure sensor connector D-18 terminal 2 for damage. Q: Is the harness wire in good condition? CONNECTOR: D-16 YES : Replace the fuel tank differential pressure sensor.
Page 398 13B-398 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 19. Check connectors D-16 at intermediate connector and D-18 at fuel tank differential pressure sensor for damage. Q: Are the connectors in good condition? CONNECTOR: D-16 YES : Go to Step 20. NO : Repair or replace it.
Page 399 13B-399 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 21. Using scan tool MB991502, check data list item 73: Fuel Tank Differential Pressure Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 400 13B-400 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0452: Evaporative Emission Control System Pressure Sensor Low Input SYSTEM DIAGRAM <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> INTAKE MANIFOLD CHECK VALVE A EVAPORATIVE EMISSION PURGE SOLENOID CHECK VALVE B FUEL TANK FUEL TANK DIFFERENTIAL EVAPORATIVE...
Page 401 13B-401 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Fuel Tank Differential Pressure Sensor Circuit TSB Revision...
Page 402 13B-402 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: C-28 CONNECTORS: C-58, C-62<M/T>, C-55, C-59 <A/T> ECM <M/T> PCM <A/T> C-62 C-55 <M/T> <A/T> C-58 <M/T>, C-59 <A/T> AC001741 AJ AC001689AN CONNECTOR: D-16 CONNECTOR: C-90 CONNECTOR BLOCK (LH) AC001991 AC001787AD CONNECTOR: D-18...
Page 403 13B-403 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Open fuel tank differential pressure sensor cir- • To check a system blockage, do a performance cuit, or loose connector. test which uses a mechanical vacuum gauge and •...
Page 404 13B-404 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the output circuit voltage at intermediate connector D-16. (1) Remove the rear seat cushion. (Refer to GROUP 52, Rear Seat P.52A-20.) (2) Remove the protector. (3) Disconnect intermediate connector D-16. (4) Use special tools (MB991658 and MB991709) to connect MB991709 terminals 5, 6 and 8 between connectors of the...
Page 405 13B-405 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connectors C-28, C-90, D-16 at intermediate connector and C-62 at ECM <M/T> or C-59 at PCM <A/T> for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 5.
Page 406 13B-406 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the harness wire between ECM connector C-62 terminal 93 <M/T> or PCM connector C-59 terminal 92 <A/T> and intermediate connector D-16 terminal 5 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-62<M/T>, C-59 <A/T>...
Page 407 13B-407 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the 5-volt supply circuit voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 408 13B-408 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connectors C-28, C-90, D-16 at intermediate connector for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 10. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 409 13B-409 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the harness wire between ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T> and intermediate connector D-16 terminal 8 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-58 <M/T>, C-55 <A/T>...
Page 410 13B-410 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check connectors C-28, C-90, D-16 at intermediate connector and C-58 at ECM <M/T> or C-55 at PCM <A/T> for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 13.
Page 411 13B-411 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check the harness wire between ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T> and intermediate connector D-16 terminal 6 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-58 <M/T>, C-55 <A/T>...
Page 412 13B-412 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 15. Check connectors D-16 at intermediate connector and D-18 at fuel tank differential pressure sensor for damage. Q: Are the connectors in good condition? CONNECTOR: D-16 YES : Go to Step 16. NO : Repair or replace it.
Page 413 13B-413 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 17. Check the harness wire between intermediate connector D-16 terminal 6 and fuel tank differential pressure sensor connector D-18 terminal 2 for damage. Q: Is the harness wire in good condition? CONNECTOR: D-16 YES : Replace the fuel tank differential pressure sensor.
Page 414 13B-414 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 19. Check connectors D-16 at intermediate connector and D-18 at fuel tank differential pressure sensor for damage. Q: Are the connectors in good condition? CONNECTOR: D-16 YES : Go to Step 20. NO : Repair or replace it.
Page 415 13B-415 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 21. Using scan tool MB991502, check data list item 73: Fuel Tank Differential Pressure Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 416 13B-416 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0453: Evaporative Emission Control System Pressure Sensor High Input SYSTEM DIAGRAM <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> INTAKE MANIFOLD CHECK VALVE A EVAPORATIVE EMISSION PURGE SOLENOID CHECK VALVE B FUEL TANK FUEL TANK DIFFERENTIAL EVAPORATIVE...
Page 417 13B-417 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Fuel Tank Differential Pressure Sensor Circuit TSB Revision...
Page 418 13B-418 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: C-28 CONNECTORS: C-58, C-62<M/T>, C-55, C-59 <A/T> ECM <M/T> PCM <A/T> C-62 C-55 <M/T> <A/T> C-58 <M/T>, C-59 <A/T> AC001741 AJ AC001689AN CONNECTOR: D-16 CONNECTOR: C-90 CONNECTOR BLOCK (LH) AC001991 AC001787AD CONNECTOR: D-18...
Page 419 13B-419 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS 1. Faulty fuel differential pressure sensor, TROUBLESHOOTING HINTS related circuit, or ECM <M/T> or PCM <A/T>. The most likely causes for this code to be set are: • To check a system blockage, do a performance •...
Page 420 13B-420 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the output circuit voltage at intermediate connector D-16. (1) Remove the rear seat cushion. (Refer to GROUP 52, Rear Seat P.52A-20.) (2) Remove the protector. (3) Disconnect intermediate connector D-16. (4) Use special tools (MB991658 and MB991709) to connect MB991709 terminals 5, 6 and 8 between connectors of the...
Page 421 13B-421 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connectors C-28, C-90, D-16 at intermediate connector and C-62 at ECM <M/T> or C-59 at PCM <A/T> for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 5.
Page 422 13B-422 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the harness wire between ECM connector C-62 terminal 93 <M/T> or PCM connector C-59 terminal 92 <A/T> and intermediate connector D-16 terminal 5 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-62<M/T>, C-59 <A/T>...
Page 423 13B-423 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the 5-volt supply circuit voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 424 13B-424 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connectors C-28, C-90, D-16 at intermediate connector for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 10. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 425 13B-425 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the harness wire between ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T> and intermediate connector D-16 terminal No.8 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-58 <M/T>, C-55 <A/T>...
Page 426 13B-426 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check connectors C-28, C-90, D-16 at intermediate connector and C-58 at ECM <M/T> or C-55 at PCM <A/T> for damage. Q: Are the connectors in good condition? CONNECTOR: C-28 YES : Go to Step 13.
Page 427 13B-427 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check the harness wire between ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T> and intermediate connector D-16 terminal 6 for damage. Q: Is the harness wire in good condition? CONNECTOR: C-58 <M/T>, C-55 <A/T>...
Page 428 13B-428 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 15. Check connectors D-16 at intermediate connector and D-18 at fuel tank differential pressure sensor for damage. Q: Are the connectors in good condition? CONNECTOR: D-16 YES : Go to Step 16. NO : Repair or replace it.
Page 429 13B-429 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 17. Check the harness wire between intermediate connector D-16 terminal 6 and fuel tank differential pressure sensor connector D-18 terminal 2 for damage. Q: Is the harness wire in good condition? CONNECTOR: D-16 YES : Replace the fuel tank differential pressure sensor.
Page 430 13B-430 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 19. Check connectors D-16 at intermediate connector and D-18 at fuel tank differential pressure sensor for damage. Q: Are the connectors in good condition? CONNECTOR: D-16 YES : Go to Step 20. NO : Repair or replace it.
Page 431 13B-431 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 21. Using scan tool MB991502, check data list item 73: Fuel Tank Differential Pressure Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 432 13B-432 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak) SYSTEM DIAGRAM <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> INTAKE MANIFOLD CHECK VALVE A EVAPORATIVE EMISSION PURGE SOLENOID CHECK VALVE B FUEL TANK EVAPORATIVE EVAPORATIVE...
Page 433 13B-433 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS EVAPORATIVE EMISSION PURGE EVAPORATIVE EMISSION CANISTER SOLENOID <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> FUEL TANK AC000183AB AC002073 AC EVAPORATIVE EMISSION EVAPORATIVE EMISSION PURGE SOLENOID VENTILATION SOLENOID <VEHICLE WITH VARIABLE INDUCTION SYSTEM>...
Page 434 13B-434 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING HINTS OVERVIEW OF TROUBLESHOOTING • To determine the cause of DTC P0455, a perfor- The most likely causes for this code to be set are: • Loose fuel cap. mance test is needed.
Page 435 13B-435 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check evaporative emission system monitor test. CAUTION • To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
Page 436 13B-436 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Using scan tool MB991502, check solenoid for clogging of the purge control. (1) Disconnect hoses B and C from the evaporative emission <VEHICLE WITHOUT VARIABLE purge solenoid side, and connect the hand vacuum pump to INDUCTION SYSTEM>...
Page 437 13B-437 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check for leaks and clogging in the evaporator line hose A to hose E <Vehicle without Variable Induction System> or hose B, C, E <Vehicle with Variable Induction System>.
Page 438 13B-438 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the evaporative emission ventilation solenoid using scan tool MB991502. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 439 13B-439 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP5. Pressure test for leaks in the evaporator line from hose F to hose P. (1) Disconnect hose G from the evaporative emission ventilation solenoid side, and plug the hoses. (2) Remove the fuel cap.
Page 440 13B-440 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for leaks in the evaporator line from hose F to hose H. (1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) The leakage test with a hand vacuum pump on each hose HOSE H from hose F to hose H.
Page 441 13B-441 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for leaks in the evaporator line from hose J to hose K. (1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) Disconnect hose J at the liquid separator side, and then connect a hand vacuum pump to the hose.
Page 442 13B-442 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the check valve A. (1) Only when you blow the check valve from the direction shown, it should pass air. (2) When you blow the check valve, air should leak from the check valve body.
Page 443 13B-443 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check for leaks in the evaporator line from hose (1) The leakage test with a hand vacuum pump on the hose P. HOSE P Q: Is the hose P in good condition? YES : Go to Step 14.
Page 444 13B-444 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS (2) Connect an evaporative emission system pressure pump to the leveling valve nipple. AC000197 (3) Plug the filler hose, feed pipe, return pipe and rollover valve nipple connected to the fuel tank. NOTE: If these items are not securely plugged here, the fuel could leak in the next step.
Page 445 13B-445 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP16. Pressure test for clogging in the evaporator line from hose I to hose P. (1) Disconnect hose I from the evaporative emission canister side, and unplug the hose I. HOSE I AC002072 AB (2) On the EVAP pressure pump, set the pressure/hold valve to...
Page 446 13B-446 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 18. Using scan tool MB991502, check evaporative emission system monitor test. CAUTION • To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
Page 447 13B-447 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 19. Check for clogging in the evaporator line hose F to H. (1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) The clogging test with a hand vacuum pump on each hose HOSE H from hose F to H.
Page 448 13B-448 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 21. Check for clogging in the evaporator line from hose J to hose K. (1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) Disconnect hose J at the liquid separator side, and then connect a hand vacuum pump to the hose.
Page 449 13B-449 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 23. Check the check valve A. (1) Only when you blow the check valve from the direction shown, it should pass air. (2) When you blow the check valve, air should leak from the check valve body.
Page 450 13B-450 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 25. Check for clogging in the evaporator line from hose N. (1) The clogging test with a hand vacuum pump on the hose N. HOSE N Q: Is the hose N in good condition? YES : Go to Step 26.
Page 451 13B-451 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak) SYSTEM DIAGRAM <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> INTAKE MANIFOLD CHECK VALVE A EVAPORATIVE EMISSION PURGE SOLENOID CHECK VALVE B FUEL TANK EVAPORATIVE EVAPORATIVE...
Page 452 13B-452 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS EVAPORATIVE EMISSION PURGE EVAPORATIVE EMISSION CANISTER SOLENOID <VEHICLE WITHOUT VARIABLE INDUCTION SYSTEM> FUEL TANK AC000183AB AC002073 AC EVAPORATIVE EMISSION EVAPORATIVE EMISSION PURGE SOLENOID VENTILATION SOLENOID <VEHICLE WITH VARIABLE INDUCTION SYSTEM>...
Page 453 13B-453 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS OVERVIEW OF TROUBLESHOOTING • Prior to doing the performance test, several sim- • To determine the cause of DTC P0456, a perfor- ple inspections are needed to exclude some pos- mance test is needed.
Page 454 13B-454 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check evaporative emission system monitor test. CAUTION • To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
Page 455 13B-455 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check evaporative emission purge solenoid for leaks. (1) Remove the battery. (2) Remove the air intake hose. (Refer to GROUP 15, Air Cleaner P.15-6.) (3) Disconnect hose C from the evaporative emission purge <VEHICLE WITHOUT VARIABLE solenoid side, and connect a hand vacuum pump to the INDUCTION SYSTEM>...
Page 456 13B-456 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check for leaks in the evaporator line hose A to hose E <Vehicle without Variable Induction System> or hose B, C, E <Vehicle with Variable Induction System>. The leakage test with a hand vacuum pump on each hose <VEHICLE WITHOUT VARIABLE from hose A to hose E <vehicle without Variable Induction...
Page 457 13B-457 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the evaporative emission ventilation solenoid using scan tool MB991502. (Actuator test item 29) CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 458 13B-458 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Pressure test for evaporator line from hose F to hose P. (1) Remove the module bracket mounting bolts, and disconnect hose G from the evaporative emission ventilation solenoid side, and plug the hoses from which the hoses have been disconnected.
Page 459 13B-459 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for leaks in the evaporator line hose F to hose H. (1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) The leakage test with a hand vacuum pump on each hose HOSE H from hose F to hose H.
Page 460 13B-460 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for leaks in the evaporator line from hose J and hose K. (1) Remove the fuel filler neck protector. (Refer to GROUP 13C, Fuel Tank P.13C-11.) (2) Disconnect hose J at the liquid separator, and then connect a hand vacuum pump to the hose.
Page 461 13B-461 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the check valve A. (1) Only when you blow the check valve from the direction shown, it should pass air. (2) When you blow the check valve, air should leak from the check valve body.
Page 462 13B-462 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check for leaks in the evaporator line hose P. (1) The leakage test with a hand vacuum pump on each hose HOSE P from hose P. Q: Is the hose in good condition? YES : Go to Step 14.
Page 463 13B-463 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS (2) Connect an evaporative emission system pressure pump to the leveling valve nipple. AC000197 (3) Plug the filler hose, feed pipe, return pipe and rollover valve nipple connected to the fuel tank. NOTE: If these items are not securely plugged here, the fuel could leak in the next step.
Page 464 13B-464 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 16. Using scan tool MB991502, check evaporative emission system monitor test. CAUTION • To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
Page 465 13B-465 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0461: Fuel Level Sensor Circuit Range/Performance Fuel Gauge Unit Circuit C-62 <M/T> (MU803783) 76 77 ENGINE CONTROL MODULE (ECM) <M/T> POWERTRAIN CONTROL C-55 <A/T> MODULE (PCM) <A/T> (MU803781) 42 43 97 <M/T>...
Page 466 13B-466 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:C-28 CONNECTOR:C-90 AK000345 AK000733AC DTC SET CONDITIONS CIRCUIT OPERATION • The fuel gauge drive signal is input in ECM (ter- Check Conditions, Judgement Criteria minal 97) <M/T> or PCM (terminal 60) <A/T>. •...
Page 467 13B-467 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check for short circuit to ground between fuel gauge unit connector D-17 terminal 2 and ECM connector C-62 terminal 97 <M/T> or PCM connector C-55 terminal 60 <A/T>.
Page 468 13B-468 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check for open circuit or harness damage between fuel gauge unit connector D-17 terminal 2 and ECM connector C-62 terminal 97 <M/T> or PCM connector C-55 terminal 60 <A/T>. NOTE: Check harness after checking intermediate connectors CONNECTOR:D-17 C-90, and C-28.
Page 469 AUTO-CRUISE CONTROL SYSTEM CENTRAL DOOR LOOKING SYSTEM C-28 DOME LIGHT AND LUGGAGE COMPARTMENT LIGHT <ECLIPSE> DOME LIGHT AND TRUNK LIGHT <ECLIPSE SPYDER> 13 14 15 10 11 12 METER AND GAUGE 18 19 20 25 26 27 2122 23 24...
Page 470 13B-470 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:C-78 CONNECTOR : B-39 AK101597AB AK000312AG CONNECTOR:C-28 CONNECTOR:C-87 AK000733AC AK000219 CONNECTOR : B-36 CONNECTOR:C-62 C-62 AK101597AC AK000310 CONNECTOR: C-112 CONNECTOR: C-111 AK101422AD AK101421AD TECHNICAL DESCRIPTION CIRCUIT OPERATION • The vehicle speed sensor converts the vehicle •...
Page 471 13B-471 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC SET CONDITIONS Judgement Criteria • Vehicle speed sensor output voltage has not Check Conditions changed (no pulse signal is input) for 2 seconds. • 2 seconds or more have passed the starting sequence was completed.
Page 472 13B-472 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using the oscilloscope, check the sensor output voltage at ECM connector C-62. (1) Do not disconnect the ECM connector C-62. (2) Disconnect the combination meter connector and auto- cruise control-ECU connector.
Page 473 13B-473 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Using scan tool MB991502, check data list item 24: Vehicle Speed Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 474 13B-474 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check connector B-39 at vehicle speed sensor for damage. Q: Is the connector in good condition? CONNECTOR : B-39 YES : Go to Step 9. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 475 13B-475 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the sensor supply voltage at vehicle speed sensor harness side connector B-39. (1) Disconnect the vehicle speed sensor connector B-39 and measure at the harness side. (2) Disconnect the combination meter connector and auto- cruise control-ECU connector.
Page 476 13B-476 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check for harness damage between ignition switch connector C-87 terminal 2 and vehicle speed sensor connector B-39 terminal 1. NOTE: Check harness after checking intermediate connectors CONNECTOR : B-39 B-36, C-28, C-78, C-112 and C-111.
Page 477 13B-477 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 16. Check for harness damage between vehicle speed sensor connector B-39 terminal 2 and ground. NOTE: Check harness after checking intermediate connector CONNECTOR : B-39 B-36 If intermediate connector is damaged, repair or replace them.
Page 478 13B-478 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0506: Idle Control System RPM Lower Than Expected Idle Air Control (IAC) Motor Circuit BATTERY A-18X RELAY B-34 IDLE AIR CONTROL (IAC) 4 5 6 MOTOR C-51 <M/T>, C-52 <A/T> (MU803784) ENGINE CONTROL MODULE (ECM) <M/T>...
Page 479 13B-479 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR:B-34 ECM<M/T> PCM<A/T> IDLE AIR CONTROL C-52 C-51 MOTOR ACX02523AI AK000225 CONNECTOR: A-18X MFI RELAY AK101363AB • The engine coolant temperature is more than CIRCUIT OPERATION approximately 77°C (171°F).
Page 480 13B-480 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 481 13B-481 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the idle air control motor coil resistance. (1) Disconnect the idle air control motor connector B-34. CONNECTOR:B-34 IDLE AIR CONTROL MOTOR ACX02523AI (2) Measure the resistance between idle air control motor connector terminal 2 and either terminal 1 or terminal 3.
Page 482 13B-482 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector A-18X at MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and idle air control motor connector B- 34 terminal 2, 5 because of open circuit or short circuit...
Page 483 13B-483 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for open circuit and short circuit to ground between idle air control motor connector B-34 and ECM connector C-51 <M/T> or PCM connector C-52 <A/T>. a. Idle air control motor connector B-34 terminal 1 and ECM CONNECTOR:B-34 connector C-51 terminal 14 <M/T>...
Page 484 13B-484 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the idle air control motor operation using special tool MB991709. (1) Remove the idle air control motor. CONNECTOR:B-34 IDLE AIR CONTROL MOTOR ACX02523AI (2) Connect special tool MB991709 to the idle air control motor. (All terminals should be connected.) (3) Use the jumper wires to connect terminal 2 of the idle air control motor connector to the battery (+) terminal.
Page 485 13B-485 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between MFI relay connector A-18X terminal 4 and idle air control motor connector B-34 terminal 2, 5. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 13.
Page 486 13B-486 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0506 is output? YES : Retry the troubleshooting.
Page 487 13B-487 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0507: Idle Control System RPM Higher Than Expected Idle Air Control (IAC) Motor Circuit BATTERY A-18X RELAY B-34 IDLE AIR CONTROL (IAC) 4 5 6 MOTOR C-51 <M/T>, C-52 <A/T> (MU803784) ENGINE CONTROL MODULE (ECM) <M/T>...
Page 488 13B-488 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR:B-34 ECM<M/T> PCM<A/T> IDLE AIR CONTROL C-52 C-51 MOTOR ACX02523AI AK000225 CONNECTOR: A-18X MFI RELAY AK101363AB • Under the closed loop idle speed control. CIRCUIT OPERATION •...
Page 489 13B-489 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 490 13B-490 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the idle air control motor coil resistance. (1) Disconnect the idle air control motor connector B-34. CONNECTOR:B-34 IDLE AIR CONTROL MOTOR ACX02523AI (2) Measure the resistance between idle air control motor connector terminal 2 and either terminal 1 or terminal 3.
Page 491 13B-491 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check connector A-18X at MFI relay for damage. Q: Is the connector in good condition? CONNECTOR: A-18X YES : Repair harness wire between MFI relay connector A- MFI RELAY 18X terminal 4 and idle air control motor connector B- 34 terminal 2, 5 because of open circuit or short circuit...
Page 492 13B-492 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for open circuit and short circuit to ground between idle air control motor connector B-34 and ECM connector C-51 <M/T> or PCM connector C-52 <A/T>. a. Idle air control motor connector B-34 terminal 1 and ECM CONNECTOR:B-34 connector C-51 terminal 14 <M/T>...
Page 493 13B-493 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Check the idle air control motor operation using special tool MB991709. (1) Remove the idle air control motor. CONNECTOR:B-34 IDLE AIR CONTROL MOTOR ACX02523AI (2) Connect special tool MB991709 to the idle air control motor. (All terminals should be connected.) (3) Use the jumper wires to connect terminal 2 of the idle air control motor connector to the battery (+) terminal.
Page 494 13B-494 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for harness damage between MFI relay connector A-18X terminal 4 and idle air control motor connector B-34 terminal 2, 5. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 13.
Page 495 13B-495 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P0507 is output? YES : Retry the troubleshooting.
Page 496 13B-496 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0551: Power Steering Pressure Sensor Circuit Range/Performance Power Steering Pressure Switch Circuit C-58 <M/T> (MU803782) 46 47 58 59 ENGINE CONTROL 60 61 67 68 MODULE (ECM) <M/T> C-55 <A/T>...
Page 497 13B-497 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • When the steering wheel is turned, hydraulic • Drive for 4 seconds or more with the vehicle pressure rises. The power steering pressure speed is 50 km/h (31 mph) or more. Stop the switch closes, and the applied battery positive vehicle [vehicle speed is 1.5 km/h (0.93 mph) or voltage will be grounded.
Page 498 13B-498 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the power supply voltage at power steering pressure switch connector B-19 by backprobing. (1) Do not disconnect the connector B-19. (2) Start the engine and run at idle. (3) Measure the voltage between terminal 1 and ground by backprobing.
Page 499 13B-499 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector B-19 at power steering pressure switch for damage. Q: Is the connector in good condition? CONNECTOR : B-19 YES : Go to Step 6. POWER NO : Repair or replace it.
Page 500 13B-500 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the power supply voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 501 13B-501 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 10. NO : Repair or replace it.
Page 502 13B-502 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 13. NO : Repair or replace it.
Page 503 13B-503 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Using scan tool MB991502, check data list item 27: Power Steering Pressure Switch. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 504 13B-504 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0622: Generator FR Terminal Circuit Malfunction Generator Circuit C-58 <M/T> (MU803782) 46 47 58 59 ENGINE CONTROL 67 68 60 61 MODULE (ECM) <M/T> C-55 <A/T> (MU803781) POWERTRAIN CONTROL MODULE (PCM) <A/T>...
Page 505 13B-505 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-58<M/T>, C-55<A/T> ECM<M/T> PCM<A/T> C-55 C-58 AK000225 CIRCUIT OPERATION DTC SET CONDITIONS • The ECM (terminal 52) <M/T> or PCM (terminal Check Conditions 54) <A/T> apply a battery positive voltage into the •...
Page 506 13B-506 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check connector B-45 at generator connector for damage. Q: Is the connector in good condition? CONNECTOR:B-45 YES : Go to Step 3. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 507 13B-507 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the voltage at generator harness side connector B-45. (1) Disconnect the connector B-45 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 4 and ground.
Page 508 13B-508 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Q: Is the harness wire in good condition? CONNECTOR:B-45 YES : Replace the ECM or PCM. Then go to Step 10. NO : Repair it. Then go to Step 10. AK000735AB CONNECTOR : C-58<M/T>, C-55<A/T>...
Page 509 13B-509 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check for harness damage between generator connector B-45 terminal 4 and ECM connector C-58 terminal 52 <M/T> or PCM connector C-55 terminal 54 <A/ T>. NOTE: Check harness after checking intermediate connector CONNECTOR:B-45 B-13.
Page 510 13B-510 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P0660: Variable Induction Control Circuit Malfunction Variable Induction Control Solenoid Circuit BATTERY A-18X RELAY B-49 (MU802722) VARIABLE INDUCTION CONTROL SOLENOID C-51 <M/T> (MU803784) 32 <M/T> 53 <A/T> 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29...
Page 511 13B-511 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: A-18X MFI RELAY AK101363AB Judgment Criteria CIRCUIT OPERATION • The variable induction control solenoid coil surge • Power to the variable induction control solenoid voltage (battery positive voltage + 2 volts) is not power is supplied from the MFI relay (terminal 4).
Page 512 13B-512 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check actuator test item 11: Variable Induction control Solenoid. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 513 13B-513 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the variable induction control solenoid. (1) Disconnect the variable induction control solenoid CONNECTOR: B-49 connector B-49. VARIABLE INDUCTION CONTROL SOLENOID AK103101AC (2) Measure the resistance between variable induction control solenoid side connector terminal 1 and 2.
Page 514 13B-514 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the power supply voltage at ECM connector C-51 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the connector C-51 <M/T> or C-55 <A/ T>.
Page 515 13B-515 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check for open circuit and short circuit to ground between variable induction control solenoid connector B- 49 terminal 2 and ECM connector C-51 terminal 32 <M/T> or PCM connector C-55 terminal 53 <A/T>. Q: Is the harness wire in good condition? CONNECTOR: B-49 YES : Replace the ECM or PCM.
Page 516 13B-516 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between MFI relay connector A-18X terminal 4 and variable induction control solenoid connector B-49 terminal 1. Q: Is the harness wire in good condition? CONNECTOR: A-18X YES : Go to Step 11.
Page 517 13B-517 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Using scan tool MB991502, check actuator test item 11: Variable Induction control Solenoid. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 518 13B-518 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DTC P1400: Manifold Defferential Pressure Sensor Manifold Differential Pressure Sensor Circuit B-04 (MU802723) MANIFOLD DIFFERENTIAL PRESSURE (MDP) SENSOR 1 2 3 C-58 <M/T> C-62 <M/T> (MU803782) (MU803783) 92 <M/T>*2 42 <M/T>*1 49 <M/T>*1 91 <A/T>*4...
Page 519 13B-519 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TECHNICAL DESCRIPTION • Engine coolant temperature is higher than 45°C • The manifold differential pressure sensor outputs (113°F). • Intake air temperature is higher than 0°C (32°F). a voltage which corresponds to the negative •...
Page 520 13B-520 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 95: Manifold Differential Pressure Sensor. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 521 13B-521 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Go to Step 5. NO : Repair or replace it.
Page 522 13B-522 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the continuity at manifold differential pressure sensor harness side connector B-04. (1) Disconnect the connector B-04 and measure at the harness side. (2) Measure the continuity between terminal 2 and ground. •...
Page 523 13B-523 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check for open circuit and harness damage between manifold differential pressure sensor connector B-04 terminal 2 and ECM connector C-58 terminal 49 <M/T> or PCM connector C-55 terminal 57 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-04 YES : Replace the ECM or PCM.
Page 524 13B-524 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check for harness damage between manifold differential pressure sensor connector B-04 terminal 3 and ECM connector C-58 terminal 42 <M/T> or PCM connector C-55 terminal 46 <A/T>. Q: Is the harness wire in good condition? CONNECTOR : B-04 YES : Go to Step 11.
Page 525 13B-525 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 − Other Monitor P.13B-6. (2) Check the diagnostic trouble code (DTC). Q: Is the DTC P1400 is output? YES : Retry the troubleshooting.
Page 526 13B-526 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-58<M/T>, C-55<A/T> CONNECTOR:C-07 ECM<M/T> PCM<A/T> C-55 C-58 AK000225 AK000312AJ Judgement Criteria TECHNICAL DESCRIPTION • Battery backup line voltage has continued to be 6 • The ECM <M/T> or PCM <A/T> is checks the volts or lower for 2 seconds.
Page 527 13B-527 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the backup power supply voltage at ECM connector C-58 <M/T> or PCM connector C-55 <A/T> by backprobing. (1) Do not disconnect the ECM connector C-58 <M/T> or PCM connector C-55 <A/T>.
Page 528 13B-528 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the backup power supply voltage at ECM harness side connector C-58 <M/T> or PCM harness side connector C-55 <A/T>. (1) Disconnect the ECM connector C-58 <M/T> or PCM connector C-55 <A/T>...
Page 529 13B-529 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check connector C-58 at ECM <M/T> or connector C-55 at PCM <A/T> for damage. Q: Is the harness connector in good condition? CONNECTOR : C-58<M/T>, C-55<A/T> YES : Replace the ECM or PCM. Then go to Step 6. NO : Repair or replace it.
Page 530 13B-530 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS SYMPTOM PROCEDURES INSPECTION PROCEDURE 1: Communication with Scan Tool Is Not Possible. (Comunication with All Systems Is Not Possible.) Data Link Connector Circuit FUSIBLE LINK (1) C-89 1 2 3 1112 13 4 5 6 7 8 9 15 16...
Page 531 13B-531 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: C-108 CONNECTOR:C-89 AK101420AD AK000345AE COMMENT CIRCUIT OPERATION • The cause is probably a defect in power supply • A battery positive voltage is applied on the data system (including ground) for the on-board diag- link connector power terminal (terminal 16).
Page 532 13B-532 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 2: Scan Tool Communication with ECM or PCM Is Not Possible. Data Link Connector Circuit C-62 <M/T> (MU803783) 76 77 ENGINE CONTROL MODULE (ECM) <M/T> C-59 <A/T> POWERTRAIN CONTROL (MU803782) MODULE (PCM) <A/T>...
Page 533 13B-533 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-62<M/T>, C-59<A/T> CONNECTOR:C-28 ECM<M/T> PCM<A/T> C-59 C-62 AK000225 AK000733AC • Improper communication line between ECM <M/ CIRCUIT OPERATION T> or PCM <A/T> and scan tool. • A diagnostic output is made from the ECM (termi- nal 85) <M/T>...
Page 534 13B-534 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check for open circuit, short circuit to ground and harness damage between data link connector C-29 terminal 7 and ECM connector C-62 terminal 85 <M/T> or PCM connector C-59 terminal 85 <A/T>. NOTE: Check harness after checking intermediate connectors CONNECTOR:C-29 C-77 and C-28.
Page 535 13B-535 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 3: The Service Engine Soon/Malfunction Indicator Lamp Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position. Service Engine Soon/Malfunction Indicator Lamp Circuit IGNITION SWITCH C-87...
Page 536 13B-536 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:C-87 CONNECTOR:C-41 AK000312AI AK000219 CONNECTOR : C-51<M/T>, C-52<A/T> CONNECTOR: C-111 PCM<A/T> ECM<M/T> C-52 C-51 AK000225 AK101421AD CONNECTOR:C-28 CONNECTOR: C-108 AK000733AC AK101420AD COMMENT CIRCUIT OPERATION • The ECM <M/T> or PCM <A/T> causes the ser- •...
Page 537 13B-537 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, check data list item 16: Power Supply Voltage. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before. con- necting or disconnecting scan tool MB991502.
Page 538 13B-538 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the power supply voltage at combination meter harness side connector C-41. (1) Disconnect the connector C-41 and measure at the harness side. (2) Turn the ignition switch to the "ON" position. (3) Measure the voltage between terminal 52 and ground.
Page 539 13B-539 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the power supply voltage ECM connector C-51 <M/T> or PCM connector C-52 <A/T>. (1) Disconnect the connector C-51 <M/T> or C-52 <A/T> and measure at the harness side. (2) Turn the ignition switch to the "ON"...
Page 540 13B-540 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 4: The Service Engine Soon/Malfunction Indicator Lamp Remains Illuminated and Never Goes Out. Service Engine Soon/Malfunction Indicator Lamp Circuit IGNITION SWITCH C-87 1 2 3 LOCK 4 5 6 C-111 MU801331 C-108...
Page 541 13B-541 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:C-28 CONNECTOR:C-41 AK000312AI AK000733AC CONNECTOR: C-111 CONNECTOR : C-51<M/T>, C-52<A/T> ECM<M/T> PCM<A/T> C-52 C-51 AK000225 AK101421AD CONNECTOR:C-87 CONNECTOR: C-108 AK000219 AK101420AD COMMENT CIRCUIT OPERATION • In cases such as the above, the cause is proba- •...
Page 542 13B-542 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 543 13B-543 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Check the Battery positive voltage. (1) Measure the Battery positive voltage during cranking. • A tachometer move. Q: Does a tachometer move? YES : Go to Step 2.
Page 544 13B-544 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the ignition system. (1) Connect the tachometer to engine speed detection CONNECTOR: A-12X AC101133 connector A-12X terminal 1. (2) Crank the engine. • A tachometer moves. (3) Turn the ignition switch to the "LOCK"...
Page 545 13B-545 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the right bank injector resistance at injector intermediate connector B-48. (1) Disconnect the injector intermediate connector B-48. (2) Measure the resistance between each male connector side CONNECTOR:B-48 terminal.
Page 546 13B-546 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check connector B-01 or B-05 or B-26 at right bank injector for damage. (1) Check the injector connector, which deviates from the CONNECTORS : B-01, B-05, B-26 standard value at Step 8.
Page 547 13B-547 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check connector C-51 at ECM <M/T> or connector C-52 <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 14. NO : Repair or replace it.
Page 548 13B-548 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check for harness damage between injector connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between injector connector B- CONNECTORS : B-01, B-02, B-05, B-06, 01 terminal 2 and ECM connector C-51 terminal 1 <M/ B-25, B-26 T>...
Page 549 13B-549 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Check the battery positive voltage. (1) Measure the battery positive voltage during cranking. • The voltage should be 8 volts or more. Q: Is the voltage normal? YES : Go to Step 2.
Page 550 13B-550 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the engine start-ability. (1) Depress the accelerator pedal slightly, and start the engine. Q: Is the start ability good? YES : Go to Step 6. NO : Go to Step 7. STEP 6.
Page 551 13B-551 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the left bank injector. (1) Disconnect the left bank injector connector B-02, B-06, B- CONNECTORS : B-02, B-06, B-25 B-02 B-06 B-25 AK000213AB (2) Measure the resistance between each injector side connector terminals 1 and 2.
Page 552 13B-552 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the right bank injector. (1) Remove the intake manifold. CONNECTORS : B-01, B-05, B-26 (2) Disconnect the right bank injector connector, which deviates from the standard value at Step 9. B-05 B-26 B-01 AK000210AB...
Page 553 13B-553 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check connector B-02, B-06, B-25 at left bank injector for damage. Q: Is the connector in good condition? CONNECTORS : B-02, B-06, B-25 YES : Go to Step 14. NO : Repair or replace it.
Page 554 13B-554 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 15. Check for harness damage between injector connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between injector connector B- CONNECTORS : B-01, B-02, B-05, B-06, 01 terminal 2 and ECM connector C-51 terminal 1 <M/ B-25, B-26 T>...
Page 555 13B-555 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Check the battery positive voltage. (1) Measure the battery positive voltage during cranking. • The voltage is 8 volts or more. Q: Is the voltage normal? YES : Go to Step 2.
Page 556 13B-556 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the ignition timing. (1) Check the ignition timing at cranking. Standard value: 5°BTDC ± 3° Q: Is the ignition timing normal? YES : Go to Step 6. NO : Check that the crankshaft position sensor and timing belt cover are in the correct position.
Page 557 13B-557 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the right bank injector resistance at injector intermediate connector B-48. (1) Disconnect the injector intermediate connector B-48. CONNECTOR:B-48 AK000209AC (2) Measure the resistance between each male connector side terminal.
Page 558 13B-558 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 9. Check connector B-01 or B-05 or B-26 at right bank injector for damage. (1) Check the injector connector, which deviated from the CONNECTORS : B-01, B-05, B-26 standard value listed in Step 7.
Page 559 13B-559 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check the connector C-51 at the ECM <M/T> or connector C-52 at the PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTOR : C-51<M/T>, C-52<A/T> YES : Go to Step 13.
Page 560 13B-560 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 13. Check for harness damage between injector connector and ECM connector <M/T> or PCM connector <A/T>. a. Check the harness wire between injector connector B- CONNECTORS : B-01, B-02, B-05, B-06, 01 terminal 2 and ECM connector C-51 terminal 1 <M/ B-25, B-26 T>...
Page 561 13B-561 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Check if the battery terminal is disconnected. Q: Has the battery terminal been disconnected lately? YES : Start the engine and let it run at idle for approximate 10 minutes after engine warm up.
Page 562 13B-562 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the idle air control (IAC) motor operation sound. (1) Check that the engine coolant temperature is 20°C (68°F) CONNECTOR:B-34 or below. NOTE: Disconnecting the engine coolant temperature sen- sor connector and connecting the harness side of the con- nector to another engine coolant temperature sensor that is at 20°C (68°F) or below is also okay.
Page 563 13B-563 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Using scan tool MB991502, check data list. (1) Turn the ignition switch to the "ON" position. (2) Check the following items in the data list. Refer to, Data List Reference Table P.13B-640.
Page 564 13B-564 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Using scan tool MB991502, check data list. (1) Turn the ignition switch to the "ON" position. (2) Check the following items of the data list. Refer to, Data List Reference Table P.13B-640.
Page 565 13B-565 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 9: Idle speed is high (improper idle speed). COMMENT TROUBLESHOOTING HINTS (The most likely • In such cases as the above, the cause is proba- causes for this case:) bly that the intake air volume during idle is too •...
Page 566 13B-566 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 567 13B-567 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 568 13B-568 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Adjust the basic idle speed. Refer to, Basic Idle Speed Adjustment for the adjustment pro- cedure P.13B-679. Standard value: 700 ± 50 r/min Q: Is the idle speed normal? YES : Refer to, Clean the throttle valve area P.13B-677.
Page 569 13B-569 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the engine idling. Q: Is the idling good enough after warm up? YES : Go to Step 5. NO : Refer to, INSPECTION PROCEDURE 8 − Unstable Idle (Rough Idle, Hunting) P.13B-560.
Page 570 13B-570 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Using scan tool MB991502, check data list. (1) Turn the ignition switch to the "ON" position. (2) Check the following items in the data list. Refer to, Data List Reference Table P.13B-640.
Page 571 13B-571 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Check if the battery terminal is disconnected. Q: Has the battery terminal been disconnected lately? YES : Start the engine and let it run at idle for approximate 10 minutes after engine warm up.
Page 572 13B-572 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check actuator test items 01, 02, 03, 04, 05, 06: Injector. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 573 13B-573 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 574 13B-574 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the fuel pressure. Refer to, Fuel Pressure Test P.13B-680. Q: Is the fuel pressure normal? YES : Go to Step 11. NO : Repair or replace. Then confirm that the malfunction symptom is eliminated.
Page 575 13B-575 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 13: The Engine Stalls when Accelerating (Pass Out). COMMENT TROUBLESHOOTING HINTS (The most likely • In case such as the above, the cause is probably causes for this case:) misfiring due to a weak spark, or an inappropriate •...
Page 576 13B-576 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 14: The engine stalls when decelerating. COMMENT TROUBLESHOOTING HINTS (The most likely • The intake air volume may be insufficient due to a causes for this case:) defective idle air control motor system.
Page 577 13B-577 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check actuator test. (1) Turn the ignition switch to the "ON" position. (2) Check the following items in the actuator test. Refer to, Actuator Test Reference Table P.13B-654.
Page 578 13B-578 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 579 13B-579 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 580 13B-580 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the fuel pressure. Refer to, Fuel Pressure Test P.13B-680. Q: Is the fuel pressure normal? YES : Check the following items, and repair or replace the defective items.
Page 581 13B-581 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 582 13B-582 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the idle air control (IAC) motor operation sound. (1) Check that the engine coolant temperature is 20°C (68°F) CONNECTOR:B-34 or below. NOTE: If necessary, you can disconnect the engine coolant temperature sensor connector and connect the harness side of the connector to another engine coolant temperature sensor that is at 20°C (68°F) or below.
Page 583 13B-583 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 584 13B-584 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 585 13B-585 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the fuel pressure. Refer to, Fuel Pressure Test P.13B-680. Q: Is the fuel pressure normal? YES : Check the following items, and repair or replace the defective items.
Page 586 13B-586 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 587 13B-587 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 588 13B-588 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check the fuel pressure. Refer to, Fuel Pressure Test P.13B-680. Q: Is the fuel pressure normal? YES : Check the following items, and repair or replace the defective items.
Page 589 13B-589 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 1. Using the scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 590 13B-590 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 22: Too high CO and HC concentration when idling TROUBLESHOOTING HINTS (The most likely COMMENT causes for this case:) • Abnormal air/fuel ratio is suspected. • Malfunction of air/fuel ratio control system. •...
Page 591 13B-591 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 592 13B-592 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the following items. (1) Check the following items, and repair or replace the defective items. a. Check the injectors for fuel leakage. b. Check the ignition coil, spark plugs, spark plug cables. c.
Page 593 13B-593 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 2. Check the following items. (1) Check the following items. a. Check all vacuum hoses and connectors. b. Check electrical wires and connectors for obvious prob- lems. c. Check the exhaust system for missing or damaged parts.
Page 594 13B-594 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 595 13B-595 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Using scan tool MB991502, check data list item 11: Left Bank Heated oxygen sensor (front). (1) Start the engine and run at idle. (2) Set scan tool MB991502 to the data reading mode for item 11, Left Bank Heated Oxygen Sensor (front).
Page 596 13B-596 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 11. Using scan tool MB991502, check data list item 69: Right Bank Heated oxygen sensor (rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 597 13B-597 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Using scan tool MB991502, check data list item 59: Left Bank Heated oxygen sensor (rear). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502.
Page 598 13B-598 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Using scan tool MB991502, read the diagnostic trouble code (DTC). CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK"...
Page 599 13B-599 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 26: Generator output voltage is low (approximately 12.3 volts) Generator Circuit B-45 (MU802046) VOLTAGE GENERATOR REGULATOR B-13 MU802749 C-51 <M/T>, C-52 <A/T> (MU803784) ENGINE CONTROL MODULE (ECM) <M/T> 11 12 13 14 15 16 17 18 19 20 21 22 23 POWERTRAIN CONTROL...
Page 600 13B-600 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR : C-51<M/T>, C-52<A/T> ECM<M/T> PCM<A/T> C-52 C-51 AK000225 TROUBLESHOOTING HINTS (The most likely CIRCUIT OPERATION causes for this charging system:) • The ECM <M/T> or PCM <A/T> controls genera- •...
Page 601 13B-601 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check connector B-45 at generator connector for damage. Q: Is the connector in good condition? CONNECTOR:B-45 YES : Go to Step 4. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 602 13B-602 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 27: Incorrect Idle Speed When the A/C is Operating (A/C Switch 2 Signal) A/C Switch 2 Signal AUTOMATIC COMPRESSOR CONTROLLER C-28 13 14 15 10 11 12 18 19 20 25 26 27 2122 23 24...
Page 603 13B-603 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:) • Malfunction of the A/C control system. • Open or shorted circuit, or improper connector contact. •...
Page 604 13B-604 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 28: Fans (radlator fan, A/C condenser fan) are inoperative Radiator Fan, A/C Condenser Fan Circuit A-30 (MU802322) FAN CONTROLLER C-07 MU801333 C-51 <M/T>, C-52 <A/T> (MU803784) ENGINE CONTROL MODULE (ECM) <M/T>...
Page 605 13B-605 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:C-07 AK000312AJ TROUBLESHOOTING HINTS (The most likely CIRCUIT OPERATION causes for this code to be set are:) • The PCM sends a duty signal to the fan controller • Malfunction of the fan motor relay. according to engine coolant temperature, vehicle •...
Page 606 13B-606 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check for open circuit and short circuit to ground and harness damage between fan controller A-30 terminal 2 and ECM connector C-51 terminal 18 <M/T> or PCM connector C-52 terminal 18 <A/T>.
Page 607 13B-607 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 29: Power supply system and ignition switch − IG system. Power Supply and Ignition Switch-IG Circuit BATTERY IGNITION SWITCH C-87 LOCK RELAY 9 20A 4 5 6 C-111 MU801331 C-07...
Page 608 13B-608 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTORS : C-58, C-62<M/T>, CONNECTOR: A-18X C-55, C-59<A/T> MFI RELAY ECM<M/T> PCM<A/T> C-55 C-62 C-59 C-58 AK101363AB AK000225 CONNECTOR:C-89 CONNECTOR: C-111 AK000345AE AK101421AD CONNECTOR:C-87 CONNECTOR: C-112 AK101422AD AK000219 CONNECTOR:C-07 AK000312AJ T>...
Page 609 13B-609 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • Improper connector contact, open circuit or short- TROUBLESHOOTING HINTS (The most likely circuited harness wire. causes for this code to be set are:) • Disconnected ECM <M/T> or PCM <A/T> ground •...
Page 610 13B-610 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the power supply voltage at MFI relay harness side connector A-18X. (1) Disconnect the connector A-18X and measure at the harness side. (2) Measure the voltage between terminal 1, 2 and ground. •...
Page 611 13B-611 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the ignition switch − IG signal voltage at ECM harness side connector C-62 <M/T> or PCM harness side connector C-59 <A/T>. (1) Disconnect the connector C-62 <M/T> or C-59 <A/T> and measure at the harness side.
Page 612 13B-612 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 6. Check the backup power supply voltage at ECM harness side connector C-58 <M/T> or PCM harness side connector C-55 <A/T>. (1) Disconnect the connector C-58 <M/T> or C-55 <A/T> and measure at the harness side.
Page 613 13B-613 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the power supply voltage at ECM harness side connector C-58 <M/T> or PCM harness side connector C-55 <A/T>. (1) Disconnect the connector C-58 <M/T> or C-55 <A/T> and measure at the harness side.
Page 614 13B-614 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 30: Fuel pump system. Fuel Pump Circuit BATTERY RELAY C-87 C-89 LOCK 1 2 3 IGNITION 1 2 3 1112 13 4 5 6 7 8 9 4 5 6 SWITCH 15 16...
Page 615 13B-615 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: C-108 CONNECTOR: D-17 AK101420AD AK000344AC CONNECTOR: C-111 CONNECTOR : C-51<M/T>, C-52<A/T> ECM<M/T> PCM<A/T> C-52 C-51 AK000225 AK101421AD CONNECTOR:C-87 CONNECTOR: C-112 AK000219 AK101422AD CONNECTOR: C-101 CONNECTOR:C-89 AK101412AI AK000345AE CONNECTOR:C-28 CONNECTOR: C-105,107 JUNCTION BLOCK FUEL PUMP...
Page 616 13B-616 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS • During cranking and while the engine is running, CIRCUIT OPERATION the ECM <M/T> or PCM <A/T> turns the power • Battery positive voltage is applied to the fuel transistor in the ECM <M/T>...
Page 617 13B-617 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the fuel pump relay 1 and 2. (1) Remove the fuel pump relay 1 and 2. CONNECTOR: C-105,C-107 JUNCTION BLOCK C-105 C-107 HARNESS SIDE CONNECTOR AK103836 AE (2) Check for continuity between the each fuel pump relay terminals 2 and 3.
Page 618 13B-618 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 4. Check the power supply voltage at fuel pump relay 1 harness side connector C-107. (1) Disconnect the connector C-107 and measure at the CONNECTOR: C-107 harness side. JUNCTION BLOCK C-107 HARNESS SIDE...
Page 619 13B-619 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS eliminated. STEP 6. Check the continuity at fuel pump relay 1 harness side connector C-107. (1) Disconnect the connector C-107 and measure at the CONNECTOR: C-107 harness side. JUNCTION BLOCK C-107 HARNESS SIDE CONNECTOR...
Page 620 13B-620 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the power supply voltage at fuel pump relay 2 harness side connector C-105. (1) Disconnect the connector C-105 and measure at the CONNECTOR: C-105 harness side. JUNCTION BLOCK (2) Turn the ignition switch to the "ON"...
Page 621 13B-621 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 10. Check the fuel pump operation. (1) Disconnect fuel pump connector D-17. (2) Use jumper wires to connect fuel pump connector terminal FUEL PUMP SIDE 5 to the positive battery terminal and terminal 4 to the CONNECTOR negative battery terminal.
Page 622 13B-622 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 12. Check for open circuit and short circuit to ground and harness damage between fuel pump relay 2 connector C-105 terminal 4 and fuel pump connector D-17 terminal 5. NOTE: Check harness after checking intermediate connectors CONNECTOR: C-105 C-101.
Page 623 13B-623 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 14. Check the power supply voltage at ECM connector C-51 <M/T> or PCM connector C-52 <A/T>. (1) Disconnect the connector C-51 <M/T> or C-52 <A/T> and measure at the harness side. (2) Turn the ignition switch to the "ON"...
Page 624 13B-624 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 31: Ignition Switch − ST System. <M/T> Ignition Switch-ST Circuit C-87 LOCK IGNITION 1 2 3 SWITCH 4 5 6 C-28 13 14 15 10 11 12 18 19 20 25 26 27 2122 23 24...
Page 625 13B-625 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: A-13X CONNECTOR:C-07 STARTER RELAY AK101399AB AK000312AJ CONNECTOR:C-28 CONNECTOR:C-87 AK000733AC AK000219 CONNECTOR:C-58 CONNECTOR : C-02 AK000357 AK000312AF TROUBLESHOOTING HINTS (The most likely CIRCUIT OPERATION causes for this case:) • The battery positive voltage is supplied to the •...
Page 626 13B-626 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS STEP 1. Check connector A-13X at starter relay for damage. Q: Is the connector in good condition? CONNECTOR: A-13X YES : Go to Step 2. NO : Repair or replace it. Refer to GROUP 00E, Harness STARTER RELAY Connector Inspection P.00E-2.
Page 627 13B-627 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the power supply voltage at ECM connector C-58. (1) Disconnect the connector C-58 and measure at the harness side. (2) Turn the ignition switch to the "START" position. (3) Measure the voltage between terminal 68 and ground.
Page 628 13B-628 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 8. Check the power supply voltage at interlock switch connector C-02. (1) Disconnect the connector C-02 and measure at the harness side. (2) Turn the ignition switch to the "START" position. (3) Measure the voltage between terminal 2 and ground.
Page 629 13B-629 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 32: Ignition Switch − ST System and Park/Neutral Position Switch System. <A/T> Ignition Switch-ST and Park/Neutral Position Switch Circuit C-87 LOCK IGNITION 1 2 3 SWITCH 4 5 6 C-28 13 14 15 10 11 12...
Page 630 13B-630 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR:C-87 CONNECTOR:C-55 AK000219 AK000227 COMMENT TROUBLESHOOTING HINTS (The most likely • If the selector lever is moved to "P" or "N" range caused for this code to be set are:) •...
Page 631 13B-631 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the power supply voltage at park/neutral position switch connector B-41. (1) Disconnect the connector B-41 and measure at the harness side. (2) Turn the ignition switch to the "START" position. (3) Measure the voltage between terminal 10 and ground.
Page 632 13B-632 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check for open circuit and short circuit to ground and harness damage between park/neutral position switch connector B-41 terminal 9 and PCM connector C-55 terminal 58. Q: Is the harness wire in good condition? CONNECTOR: B-41 YES : Replace the PCM.
Page 633 13B-633 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 33: Ignition Circuit System Ignition Circuit C-87 LOCK IGNITION SWITCH 4 5 6 C-111 MU801331 C-108 JUNCTION 1213 BLOCK 212223 2425 26 27 28 C-89 1 2 3 1112 13 4 5 6 7 8 9 15 16...
Page 634 13B-634 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONNECTOR: C-108 CONNECTOR: B-22 AK101420AD AK000217AB AK000217 CONNECTOR:C-89 CONNECTOR: C-111 AK000345AE AK101421AD CONNECTOR:C-87 CONNECTOR : C-51<M/T>, C-52<A/T> ECM<M/T> PCM<A/T> C-52 C-51 AK000219 AK000225 CONNECTOR: A-12X AC101133 CONNECTOR:C-07 ENGINE SPEED DETECTION CONNECTOR AC101151...
Page 635 13B-635 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS STEP 1. Check connector B-22 at distributor for damage. Q: Is the connector in good condition? CONNECTOR: B-22 YES : Go to Step 2. NO : Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2.
Page 636 13B-636 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 5. Check the continuity at distributor harness side connector B-22. (1) Disconnect the connector B-22 and measure at the harness side. (2) Check for the continuity between terminal 4 and ground. •...
Page 637 13B-637 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 7. Check for open circuit between distributor connector B-22 terminal 3 and ECM connector C-51 terminal 11 <M/T> or PCM connector C-52 terminal 11 <A/ T>. Q: Is the harness wire in good condition? CONNECTOR: B-22 YES : Go to Step 8.
Page 638 13B-638 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INSPECTION PROCEDURE 34: A/C system. A/C Circuit AUTOMATIC COMPRESSOR A/C COMPRESSOR CONTROLLER RELAY C-62 <M/T> 83 <M/T>*2 20 <M/T>*1 (MU803783) 83 <A/T>*4 20 <A/T>*3 76 77 C-51 <M/T>, C-52 <A/T> (MU803784) C-59 <A/T>...
Page 639 13B-639 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS DIAGNOSIS STEP 1. Check connector C-51, C-62 at ECM <M/T> or connector C-52, C-59 at PCM <A/T> for damage. Q: Is the connector in good condition? CONNECTORS : C-51, C-62<M/T>, C-52, C-59<A/T>...
Page 640 13B-640 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS STEP 3. Check the circuit at ECM connector C-62 <M/T> or PCM connector C-59. (1) Disconnect the connectors C-62 <M/T> or C-59 <A/T> and measure at the harness side. (2) Turn the ignition switch to the "ON"...
Page 641 13B-641 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY • Engine: warming up, idling Procedure P.13B- • A/C switch: "OFF" RELAY compressor No. 34 clutch relay •...
Page 642 13B-642 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY • Engine: cranking CRANK Crankshaft Engine Code No. P.13B- • Tachometer: connected SENSOR position speeds P0335 displayed on...
Page 643 13B-643 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY Engine coolant Ignition switch: Engine coolant −20°C (−4°F) Code No. P.13B- SENSOR temperature "ON" or with temperature is P0116, sensor...
Page 644 13B-644 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY • Engine: cranking ENGINE Crankshaft Engine Code No. P.13B- • Tachometer: connected SPEED position speeds P0335 displayed on...
Page 645 13B-645 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY HO2S Heated oxygen Engine: When the 200 mV or Code No. P.13B- BANK1 S1 sensor (bank warming up engine is...
Page 646 13B-646 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY 0 and 600 − HO2S Heated oxygen Engine: Revving Code No. P.13B- BANK1 S2 sensor (bank warming up 1,000 mV...
Page 647 13B-647 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY HO2S Heated oxygen Engine: Warm When the 0.2 V or less Code No. P.13B- BANK2 S1 sensor (bank (air/fuel...
Page 648 13B-648 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY • Engine 2 − 25 STEP − IAC VALVE Idle air control A/C switch: −...
Page 649 13B-649 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY Intake air Ignition switch: Intake air −20°C (−4°F) Code No. P.13B- SENSOR temperature "ON" or with temperature is P0111, sensor...
Page 650 13B-650 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY 13.2 − 19.8 INJECTOR Injectors Engine: When engine − − cranking coolant (bank 1) temperature is 0°C (32°F) 33.2 −...
Page 651 13B-651 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY 13.2 − INJECTOR Injectors Engine: When engine − − cranking coolant 19.8 mS (bank 2) temperature is 0°C (32°F) 33.2 −...
Page 652 13B-652 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY SHORT Short-term fuel Engine: warming up, 2,500 r/min Code No. −25 − 25% P.13B- TRIM B2 compensation without any load (during closed...
Page 653 13B-653 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION ITEM INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL CONDITION PROCEDURE PAGE DISPLAY • Engine Engine is idling 17 − 46 HZ Volume air flow − − SENSOR sensor (mass coolant...
Page 654 13B-654 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS ACTUATOR TEST REFERENCE TABLE M1131152500149 NOTE: *: Continues for 27 minutes. Can be released by pressing the CLEAR key. MUT-II SCAN ITEM INSPECTION DRIVE INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL ITEM CONTENTS...
Page 655 13B-655 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS MUT-II SCAN ITEM INSPECTION DRIVE INSPECTION REQUIREMENT NORMAL INSPECTION REFERENCE TOOL ITEM CONTENTS CONDITION PROCEDURE PAGE DISPLAY NO. 1 Injectors Cut fuel to No. Engine: warm, idle (cut the fuel Idling Code No.
Page 656 13B-656 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TERMINAL TERMINAL INSPECTION ITEM INSPECTION CONDITION (ENGINE CONDITION) NORMAL CONDITION NO. <M/T> NO. <A/T> Left bank heated Engine: warming up, idling 9 − 11 V oxygen sensor 9 − 11 V → B+ Engine: Revving heater (front) (momentarily)
Page 657 13B-657 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TERMINAL TERMINAL INSPECTION ITEM INSPECTION CONDITION (ENGINE CONDITION) NORMAL CONDITION NO. <M/T> NO. <A/T> Left bank heated Engine: warming up, idling 1 V or less oxygen sensor Engine: Revving heater (rear) Right bank heated Engine: warming up, idling...
Page 658 13B-658 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TERMINAL TERMINAL INSPECTION ITEM INSPECTION CONDITION (ENGINE CONDITION) NORMAL CONDITION NO. <M/T> NO. <A/T> Variable induction Engine: idling 1 V or less control solenoid Engine: 5,000 r/min 3.7 − 4.3 V Barometric Ignition switch: When altitude is 0 m (0 ft)
Page 659 13B-659 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TERMINAL TERMINAL INSPECTION ITEM INSPECTION CONDITION (ENGINE CONDITION) NORMAL CONDITION NO. <M/T> NO. <A/T> Right bank heated • Engine: warming up 0 and 0.6 − 1.0 V • Revving oxygen sensor alternates (rear)
Page 660 13B-660 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TERMINAL TERMINAL INSPECTION ITEM NORMAL CONDITION (INSPECTION CONDITION) NO. <M/T> NO. <A/T> 1 − 47 1 − 41 13 − 16 Ω [at 20°C (68°F)] No.1 injector 9 − 47 9 −...
Page 661 13B-661 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TERMINAL TERMINAL INSPECTION ITEM NORMAL CONDITION (INSPECTION CONDITION) NO. <M/T> NO. <A/T> 62 − 49 64 − 57 Intake air temperature sensor 13 − 17 kΩ [when intake air temperature is − 20°C (−4°F)] 5.3 −...
Page 662 13B-662 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Standard wave pattern THE TIME (CYCLE TIME) T IS REDUCED WHEN THE AMOUNT OF INTAKE AIR INCREASES. TIMES T AND T ARE EQUAL TIME AKX01595 Observation conditions Rev engine, observe T1 and T2 remain equal. Standard wave pattern TIME AKX01596...
Page 663: Alternate Method (Test Harness Not Available)
13B-663 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Example 2 • Cause of problem Damaged rectifier or vortex generation column. • Wave pattern characteristics Unstable wave pattern with non-uniform frequency. An igni- tion leak will distort the wave pattern temporarily, even if the volume air flow sensor is normal.

Page 664 13B-664 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Standard wave pattern 2 ENGINE REVOLUTIONS (1 CAMSHAFT REVOLUTION) BTDC CYCLE TIME CHANGES BTDC WITH ENGINE SPEED CHANGES CRANKSHAFT POSITION SENSOR OUTPUT WAVE PATTERN CAMSHAFT POSITION SENSOR OUTPUT WAVE PATTERN TIME NO.1 TDC NO.2 TDC...
Page 665 13B-665 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS INJECTOR Required Special Tools: OSCILLOSCOPE • MB991348: Test Harness INJECTOR INTERMEDIATE • MD998464: Test Harness CONNECTOR Measurement Method <Measure at the right bank (number 1, 3, 5 cylinders)> MD998464 AK102981 1.
Page 666: Standard Wave Pattern
13B-666 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Standard wave pattern POINT A INJECTION COIL INDUCED VOLTAGE (APPROXIMATELY 50-60 V) POINT B: INJECTOR DRIVE TIME POWER VOLTAGE DRIVE SIGNAL:"ON" DRIVE SIGNAL:"OFF" AKX01604 Wave Pattern Observation Points Point A: Height of injector coil induced voltage. CONTRAST WITH PROBABLE CAUSE STANDARD WAVE...
Page 667: Function
13B-667 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS Measurement Method 1. Disconnect the idle air control motor connector, and connect OSCILLOSCOPE the test harness special tool (MB991709) in between. (All IDEL AIR CONTROL MOTOR CONNECTOR terminals should be connected.) 2.
Page 668 13B-668 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONTRAST WITH PROBABLE CAUSE STANDARD WAVE PATTERN Induced electromotive force Malfunction of motor does not appear or is extremely small Point B: Height of coil back electromotive force CONTRAST WITH PROBABLE CAUSE STANDARD WAVE PATTERN...
Page 669: Engine R/Min
13B-669 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS IGNITION COIL AND IGNITION POWER TRANSISTOR Required Special Tool: • MB991348: Test Harness Set Measurement Method 1. Disconnect the connector, and connect test harness special OSCILLOSCOPE DISTRIBUTOR tool, (MB991348), in between. (All terminals should be CONNECTOR connected.) 1 2 3 4 5 6 7...
Page 670 13B-670 MULTIPORT FUEL INJECTION (MFI) <3.0L> MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS CONDITION OF WAVE PROBABLE CAUSE PATTERN BUILD-UP SECTION AND MAXIMUM VOLTAGE Rises from approximate 2 Normal volts to approximate 4.5 volts at the top-right 2-volt rectangular wave Open-circuit in ignition primary circuit Rectangular wave at power Ignition power transistor...
Page 671 13B-671 MULTIPORT FUEL INJECTION (MFI) <3.0L> SPECIAL TOOLS SPECIAL TOOLS M1131000600063 TOOL TOOL NUMBER AND SUPERSESSION APPLICATION NAME • Reading diagnostic MB991502 DRB-III W/CH8425 Scan tool <MUT-II> trouble code • MFI system inspection • Measurement of fuel pressure B991502 • Adjustment of throttle MB991348 General Service Tool Test harness set...
Page 672 13B-672 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE TOOL TOOL NUMBER AND SUPERSESSION APPLICATION NAME MD998709 Measurement of fuel Adaptor hose pressure MD998742 MD998742 Hose adaptor MB991637 Fuel pressure gauge set MB991637 ON-VEHICLE SERVICE COMPONENT LOCATION M1131002100332 NAME SYMBOL NAME SYMBOL Air conditioning compressor clutch Injector...
Page 673 13B-673 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE NAME SYMBOL NAME SYMBOL Fuel pump module (Fuel Variable induction control solenoid temperature sensor) <with variable induction system> Fuel pump relay 1, 2 Volume air flow sensor (with built-in intake air temperature sensor and Idle air control motor barometric pressure sensor) AK101678AC...
Page 674 13B-674 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE KNOCK SENSOR RIGHT BANK HEATED OXYGEN SENSOR (REAR) AK103511 AK103511AC ACX02493 AK MANIFOLD DIFFERENTIAL INJECTORS PRESSURE SENSOR ACX02483 AI AK000103 AK000103AD THROTTLE POSITION SENSOR IDLE AIR CONTROL MOTOR ACX02484 AK ACX02523 AK <WITH VARIABLE INDUCTION SYSTEM>...
Page 675 13B-675 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE AC101133 CRANK SHAFT POSITION BATTERY SENSOR MFI RELAY CRANK SHAFT SPROCKET ENGINE SPEED A/C COMPRESSOR DETECTION RELAY CONNECTOR AK101426 ACX02486 LEFT BANK HEATED OXYGEN SENSOR (FRONT) LEFT BANK HEATED OXYGEN SENSOR (REAR) ACX02488 AK ACX02489 AJ VEHICLE...
Page 676 13B-676 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE FUEL PUMP RELAY (2) VOLUME AIR FLOW SENSOR FUEL PUMP RELAY (1) ACX02480 AJ AK101398AF DATA LINK ECM OR PCM CONNECTOR ACX02447 AL ACX02509 AN FUEL TANK DIFFERENTIAL EVAPORATIVE EMISSION PRESSURE VENTILATION SOLENOID SENSOR FUEL PUMP MODULE...
Page 677: Throttle Body (Throttle Valve Area) Cleaning
13B-677 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE THROTTLE BODY (THROTTLE VALVE AREA) CLEANING M1131001000064 1. Start the engine and warm it up until the coolant is heated to 80°C (176°F) or higher. Stop the engine. 2. Remove the air intake hose from the throttle body. CAUTION Do not allow cleaning solvent to enter the bypass passage.
Page 678 13B-678 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE CAUTION To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before con- necting or disconnecting scan tool MB991502. 1. Connect scan tool MB991502 to the data link connector. When not using the scan tool, proceed as follows.
Page 679: Basic Idle Speed Adjustment
13B-679 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE BASIC IDLE SPEED ADJUSTMENT M1131001800208 Required Special Tool: • MB991502: Scan Tool (MUT-II) NOTE: The standard idling speed has been adjusted with the speed adjusting screw (SAS), by the manufacturer. There should be no need for readjustment. NOTE: If the adjustment has been changed by mistake, the idle speed may become too high or the idle speed may drop too low when loads A/C, defogger, etc.
Page 680: Fuel Pressure Test
13B-680 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE FUEL PRESSURE TEST M1131001900056 Required Special Tools: • MB991502: Scan Tool (MUT-II) • MB991637: Fuel Pressure Gauge Set • MD998709: Adaptor Hose • MD998742: Hose Adaptor 1. Release residual pressure from the fuel line to prevent fuel spray.
Page 681 13B-681 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE 8. Measure fuel pressure while the engine is running at idle. Standard value: Approximately 270 kPa (38 psi) at curb idle 9. Disconnect the vacuum hose (blue stripe) from the fuel pressure regulator and measure fuel pressure with the hose end closed with your finger.
Page 682: Fuel Pump Connector Disconnection
13B-682 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE 14.Release residual pressure from the fuel pipe line. (Refer to P.13B-682 WARNING Cover the hose connection with shop towels to pre- vent splash of fuel that could be caused by some residual pressure in the fuel pipe line. 15.Remove the fuel pressure gauge, and special tools MD998709, MD998742 and MB991637 from the fuel rail.
Page 683: Throttle Position Sensor Check
13B-683 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE THROTTLE POSITION SENSOR CHECK M1131003200213 Required Special Tool: • MB991348: Test Harness Set Checking the Terminal Resistance 1. Disconnect the throttle position sensor connector. 2. Measure the resistance between throttle position sensor side connector terminals 1 and 4.
Page 684: Heated Oxygen Sensor Check
13B-684 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE HEATED OXYGEN SENSOR CHECK M1131005000237 Required Special Tools: • MD998464: Test Harness • MB991316: Test Harness • MB991658: Test Harness Set <Right bank and left bank heated oxygen sensor (front)> 1. Use scan tool MB991502, observe HO S reading.
Page 685 13B-685 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE <Right bank and left bank heated oxygen sensor (rear)> 1. Use scan tool MB991502, observe HO2S reading. If values are unsatisfactory, or if the scan tool is not available, use the following procedure: (1) Disconnect the heated oxygen sensor connector and connect special tool MB991316 to the connector on the heated oxygen sensor side.
Page 686: Injector Check
13B-686 MULTIPORT FUEL INJECTION (MFI) <3.0L> ON-VEHICLE SERVICE INJECTOR CHECK M1131005200060 <Right bank side (number 1, 3, 5 cylinders)> 1. Disconnect the injector intermediate connector. 2. Measure the resistance between the injector intermediate connector terminals. Standard value: INJECTOR NO. MEASUREMENT RESISTANCE TERMINAL 13 −...
Page 687: Variable Induction Control Solenoid Check
13B-687 MULTIPORT FUEL INJECTION (MFI) <3.0L> INJECTOR VARIABLE INDUCTION CONTROL SOLENOID CHECK M1131006500020 Refer to GROUP 15, Intake and Exhaust System − On-vehicle Service − Variable Induction Control (VIC) Solenoid Check P.15-4. INJECTOR REMOVAL AND INSTALLATION M1131007100304 Pre-removal Operation Post-installation Operation •...
Page 688 13B-688 MULTIPORT FUEL INJECTION (MFI) <3.0L> INJECTOR REMOVAL SERVICE POINT <<A>> FUEL RAIL/INJECTORS REMOVAL CAUTION Do not drop the injector. Remove the fuel rail with the injectors attached to it. INSTALLATION SERVICE POINT >>A<< INJECTORS/FUEL PRESSURE REGULATOR/HIGH- PRESSURE FUEL HOSE INSTALLATION CAUTION Do not allow the engine oil to enter the fuel rail, otherwise it will be damaged.
Page 689: Throttle Body Assembly
13B-689 MULTIPORT FUEL INJECTION (MFI) <3.0L> THROTTLE BODY ASSEMBLY THROTTLE BODY ASSEMBLY REMOVAL AND INSTALLATION M1131007700317 Pre-removal Operation Post-installation Operation • Engine Coolant Draining [Refer to GROUP 00, Mainte- • Air Cleaner Installation (Refer to GROUP 15, Air Cleaner nance Service − Engine Coolant (Change) P.00-56.] P.15-6.) •...
Page 690: Disassembly And Assembly
13B-690 MULTIPORT FUEL INJECTION (MFI) <3.0L> THROTTLE BODY ASSEMBLY INSTALLATION SERVICE POINT >>A<< THROTTLE BODY GASKET INSTALLATION CAUTION Poor idling etc. may result if the throttle body gasket is installed incorrectly. Install the throttle body gasket as shown in the illustration. PROJECTION AC000233 DISASSEMBLY AND ASSEMBLY...
Page 691 13B-691 MULTIPORT FUEL INJECTION (MFI) <3.0L> THROTTLE BODY ASSEMBLY DISASSEMBLY SERVICE POINTS <<A>> THROTTLE POSITION SENSOR DISASSEMBLY 1. Do not disassemble the sensor and motor. 2. Do not clean the sensor and motor by dipping them into cleaning solvent. Clean them with shop towel. <<B>>...
Page 692: General Specifications
Idle air control motor Stepper motor (stepper motor type by- pass air control system with the air volume limiter) Engine control Identification model No. E6T35971 <Eclipse and Eclipse module (ECM) <M/ spyder without variable induction T> system> E6T35972 <Eclipse-with variable induction system>...
Page 693: Service Specifications
13B-693 MULTIPORT FUEL INJECTION (MFI) <3.0L> SPECIFICATIONS ITEMS SPECIFICATIONS Sensors Volume air flow sensor Karman vortex type Barometric pressure sensor Semiconductor type Intake air temperature sensor Thermistor type Engine coolant temperature sensor Thermistor type Heated oxygen sensor Zirconia type Vehicle speed sensor <M/T> Electromagnetic resistance element type Park/neutral position switch <A/T>...
Page 694: Sealant And Adhesive
13B-694 MULTIPORT FUEL INJECTION (MFI) <3.0L> SPECIFICATIONS ITEMS STANDARD VALUE 14 − 17 Engine coolant temperature sensor -20°C (-4°F) resistance kΩ 5.1 − 6.5 0°C (32°F) 20°C (68°F) 2.1 − 2.7 0.9 − 1.3 40°C (104°F) 0.48 − 0.68 60°C (140°F) 80°C (176°F) 0.26 −...