Subaru IMPREZA 2004 Service Manual
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Subaru IMPREZA 2004 Service Manual

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2004 IMPREZA SERVICE MANUAL

ENGINE SECTION 1

This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.
FUJI HEAVY INDUSTRIES LTD.
QUICK REFERENCE INDEX
FUEL INJECTION (FUEL SYSTEMS)
EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES)
INTAKE (INDUCTION)
MECHANICAL
EXHAUST
COOLING
LUBRICATION
SPEED CONTROL SYSTEMS
IGNITION
STARTING/CHARGING SYSTEMS
ENGINE (DIAGNOSTICS)
FUEL INJECTION (FUEL SYSTEMS)
EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES)
INTAKE (INDUCTION)
MECHANICAL
EXHAUST
COOLING
FU(H4SO)
EC(H4SO)
IN(H4SO)
ME(H4SO)
EX(H4SO)
CO(H4SO)
LU(H4SO)
SP(H4SO)
IG(H4SO)
SC(H4SO)
EN(H4SO)(diag)
FU(H4SOw/oOBD)
EC(H4SOw/oOBD)
IN(H4SOw/oOBD)
ME(H4SOw/oOBD)
EX(H4SOw/oOBD)
CO(H4SOw/oOBD)
G1870GE2

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Summary of Contents for Subaru IMPREZA 2004

  • Page 1: Engine Section

    EC(H4SO) (AUX. EMISSION CONTROL DEVICES) INTAKE (INDUCTION) IN(H4SO) MECHANICAL ME(H4SO) This service manual has been prepared to provide SUBARU service personnel EXHAUST EX(H4SO) with the necessary information and data for the correct maintenance and repair of SUBARU vehicles. COOLING CO(H4SO)
  • Page 2 2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX ENGINE SECTION 1 LUBRICATION LU(H4SOw/oOBD) SPEED CONTROL SYSTEMS SP(H4SOw/oOBD) IGNITION IG(H4SOw/oOBD) STARTING/CHARGING SYSTEMS SC(H4SOw/oOBD) EN(H4SOw/oOBD) ENGINE (DIAGNOSTICS) (diag) G1870GE2...

  • Page 3: Table Of Contents

    Engine Control Module (ECM) I/O Signal ..........23 Engine Condition Data ................26 Transmission Control Module (TCM) I/O Signal ........27 Data Link Connector .................28 OBD-II General Scan Tool ................29 Subaru Select Monitor................32 Read Diagnostic Trouble Code (DTC) ............39 Inspection Mode..................40 Drive Cycle....................45 Clear Memory Mode..................47 Compulsory Valve Operation Check Mode ..........48...

  • Page 4: Basic Diagnostic Procedure

    Select Monitor or OBD-II general scan tool Code (DTC).> Go function indicator switch to ON. to step 4. light illuminates, 4)Read the DTC on the Subaru Select Monitor perform diagnos- or OBD-II general scan tool. tics of malfunction indicator light cir- cuit or combination meter.
  • Page 5 Basic Diagnostic Procedure ENGINE (DIAGNOSTICS) 2. AUTOMATIC TRANSMISSION When the DTC about automatic transmission is shown on display, carry out the following basic check. After that, carry out the replacement or re- pair work. 1) ATF level check <Ref. to 4AT-31, Automatic Transmission Fluid.>...

  • Page 6: Check List For Interview

    Check List for Interview ENGINE (DIAGNOSTICS) 2. Check List for Interview A: CHECK 1. CHECK LIST No. 1 Check the following items when problem has occurred. NOTE: Use copies of this page for interviewing customers. Customer’s name Engine No. Date of sale Fuel brand Date of repair Odometer reading...
  • Page 7 Check List for Interview ENGINE (DIAGNOSTICS) 2. CHECK LIST No. 2 Check the following items about the vehicle’s state when malfunction indicator light turns on. NOTE: Use copies of this page for interviewing customers. a) Other warning lights or indicators turn on. ❏ Yes / ❏ No ❏...

  • Page 8: General Description

    General Description ENGINE (DIAGNOSTICS) 3. General Description 8) Use ECM mounting stud bolts at the body side grounding point when measuring voltage and resis- A: CAUTION tance inside the passenger compartment. 1) Airbag system wiring harness is routed near the ECM, main relay and fuel pump relay.
  • Page 9 General Description ENGINE (DIAGNOSTICS) 12) Observe the following cautions when installing 2) Check the condition of the main and other fuses, a radio in MFI equipped models. and harnesses and connectors. Also check for proper grounding. CAUTION: • The antenna must be kept as far apart as pos- 2.
  • Page 10 TOOL NUMBER DESCRIPTION REMARKS 24082AA230 CARTRIDGE Troubleshooting for electrical systems. ST24082AA230 22771AA030 SUBARU SELECT Troubleshooting for electrical systems. MONITOR KIT • English: 22771AA030 (Without printer) • German: 22771AA070 (Without printer) • French: 22771AA080 (Without printer) • Spanish: 22771AA090 (Without printer) ST22771AA030...

  • Page 11: Electrical Components Location

    Electrical Components Location ENGINE (DIAGNOSTICS) 4. Electrical Components Location A: LOCATION 1. ENGINE • MODULE EN-01397 EN-01398 Engine control module (ECM) Test mode connector Data link connector Malfunction indicator light EN(H4SO)(diag)-9...
  • Page 12 Electrical Components Location ENGINE (DIAGNOSTICS) EN-01399 EN-00156 EN-01149 EN-01150 EN(H4SO)(diag)-10...
  • Page 13 Electrical Components Location ENGINE (DIAGNOSTICS) • SENSOR EN-01400 Intake air temperature sensor Engine coolant temperature sen- Knock sensor Manifold absolute pressure sen- Camshaft position sensor Throttle position sensor Crankshaft position sensor EN(H4SO)(diag)-11...
  • Page 14 Electrical Components Location ENGINE (DIAGNOSTICS) ( 2) EN-00160 EN-00006 EN-00008 EN-00161 EN-00010 EN-00011 EN-00012 EN(H4SO)(diag)-12...
  • Page 15 Electrical Components Location ENGINE (DIAGNOSTICS) EN-00162 Front oxygen (A/F) sensor Front catalytic converter Rear catalytic converter Rear oxygen sensor EN-00014 EN-00163 EN-00016 EN-00164 EN(H4SO)(diag)-13...
  • Page 16 Electrical Components Location ENGINE (DIAGNOSTICS) EN-01401 EN-01402 Fuel level sensor EN-01403 EN(H4SO)(diag)-14...
  • Page 17 Electrical Components Location ENGINE (DIAGNOSTICS) • SOLENOID VALVE, EMISSION CONTROL SYSTEM PARTS AND IGNITION SYSTEM PARTS EN-01404 Idle air control solenoid valve Air assisted injector solenoid valve EGR valve (1.6 L model) Purge control solenoid valve Ignition coil & ignitor ASSY EN(H4SO)(diag)-15...
  • Page 18 Electrical Components Location ENGINE (DIAGNOSTICS) (1 ) EN-00249 EN-00250 EN-01595 EN-00251 EN-01590 EN(H4SO)(diag)-16...
  • Page 19 Electrical Components Location ENGINE (DIAGNOSTICS) EN-01405 EN-01406 Inhibitor switch Fuel pump relay Starter Fuel pump Radiator main fan relay Main relay Radiator sub fan relay EN(H4SO)(diag)-17...
  • Page 20 Electrical Components Location ENGINE (DIAGNOSTICS) EN-00178 EN-01407 EN-01408 EN-01409 EN-00180 EN-00181 EN(H4SO)(diag)-18...
  • Page 21 Electrical Components Location ENGINE (DIAGNOSTICS) 2. TRANSMISSION • MODULE EN-01410 EN-01411 Transmission control module AT diagnostic indicator light (AT (TCM) (AT model) model) EN(H4SO)(diag)-19...
  • Page 22 Electrical Components Location ENGINE (DIAGNOSTICS) EN-01413 EN-01412 EN-01414 EN(H4SO)(diag)-20...
  • Page 23 Electrical Components Location ENGINE (DIAGNOSTICS) • SENSOR EN-00184 EN-00107 EN-00186 EN-00187 EN-00188 Rear vehicle speed sensor (AT Front vehicle speed sensor (AT ATF temperature sensor (AT model) model) model) Front vehicle speed sensor (MT Torque converter turbine speed Brake light switch model) sensor EN(H4SO)(diag)-21...
  • Page 24 Electrical Components Location ENGINE (DIAGNOSTICS) • SOLENOID VALVE AND SWITCH (AT MODELS) AT-00334 AT-00335 EN-01415 Shift solenoid valve 1 Low clutch timing solenoid 2-4 brake timing solenoid Shift solenoid valve 2 Lock up duty solenoid Transfer duty solenoid Line pressure duty solenoid 2-4 brake duty solenoid Inhibitor switch •...

  • Page 25: Engine Control Module (Ecm) I/O Signal

    Engine Control Module (ECM) I/O Signal ENGINE (DIAGNOSTICS) 5. Engine Control Module (ECM) I/O Signal A: ELECTRICAL SPECIFICATION B134 B135 B137 B136 EN-00258 Signal (V) Connector Terminal Content Note Ignition SW ON Engine ON (Idling) (Engine OFF) −7 to +7 Signal (+) B135 Sensor output waveform...
  • Page 26 Engine Control Module (ECM) I/O Signal ENGINE (DIAGNOSTICS) Signal (V) Connector Terminal Content Note Ignition SW ON Engine ON (Idling) (Engine OFF) ON: 10 — 13 ON: 12 — 14 A/C switch B136 — OFF: 0 OFF: 0 Ignition switch B136 10 —...
  • Page 27 Engine Control Module (ECM) I/O Signal ENGINE (DIAGNOSTICS) Signal (V) Connector Terminal Content Note Ignition SW ON Engine ON (Idling) (Engine OFF) ON: 0 ON: 0 Small light switch B137 — OFF: 10 — 13 OFF: 12 — 14 ON: 0 ON: 0 Blower fan switch B137...

  • Page 28: Engine Condition Data

    Engine Condition Data ENGINE (DIAGNOSTICS) 6. Engine Condition Data A: ELECTRICAL SPECIFICATION Content Specified data 1.6 — 2.9 (%): Idling Engine load 6.4 — 12.8 (%): 2,500 rpm racing Measuring condition: • After the engine is warmed-up. • Gear position is in “N” or “P” range. •...

  • Page 29: Transmission Control Module (Tcm) I/O Signal

    Transmission Control Module (TCM) I/O Signal ENGINE (DIAGNOSTICS) 7. Transmission Control Mod- ule (TCM) I/O Signal A: ELECTRICAL SPECIFICATION For electrical specification of TCM I/O signal, refer to 4AT section. <Ref. to 4AT(diag)-13, ELECTRI- CAL SPECIFICATION, Transmission Control Mod- ule (TCM) I/O Signal.> EN(H4SO)(diag)-27...

  • Page 30: Data Link Connector

    This connector is used both for OBD-II general scan tools and the Subaru Select Monitor. CAUTION: Do not connect any scan tools other than the OBD-II general scan tools and the Subaru Select Mon- itor, because the circuit for the Subaru Select Monitor may be damaged.

  • Page 31: Obd-Ii General Scan Tool

    OBD-II General Scan Tool ENGINE (DIAGNOSTICS) 9. OBD-II General Scan Tool A: OPERATION 1. HOW TO USE OBD-II GENERAL SCAN TOOL 1) Prepare a general scan tool (OBD-II general scan tool) required by SAE J1978. 2) Connect the OBD-II general scan tool to data link connector located in the lower portion of the in- strument panel (on driver’s side).
  • Page 32 OBD-II General Scan Tool ENGINE (DIAGNOSTICS) 2. MODE $01 (CURRENT POWERTRAIN DIAGNOSTIC DATA) Refers to data denoting the current operating condition of analog input/output, digital input/output or the pow- ertrain system. A list of the support data and PID (Parameter Identification) codes are shown in the following table. Data Unit of measure Number of emission-related powertrain DTC and malfunction indicator light status...
  • Page 33 OBD-II General Scan Tool ENGINE (DIAGNOSTICS) 4. MODE $03 (EMISSION-RELATED POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC)) Refer to Read Diagnostic Trouble Code (DTC) for information about data denoting emission-related power- train DTC. <Ref. to EN(H4SO)(diag)-39, Read Diagnostic Trouble Code (DTC).> 5. MODE $04 (CLEAR/RESET EMISSION-RELATED DIAGNOSTIC INFORMATION) Refers to mode used to clear or reset emission-related diagnostic information (OBD-II trouble diagnostic in- formation).

  • Page 34: Subaru Select Monitor

    Select Monitor and OBD-II general scan tool. 5) Turn the ignition switch to ON (engine OFF) and 1. HOW TO USE SUBARU SELECT MONI- Subaru Select Monitor switch to ON. 1) Prepare the Subaru Select Monitor kit. <Ref. to EN(H4SO)(diag)-8, PREPARATION TOOL, Gen- eral Description.> EN-00040...
  • Page 35 Subaru Select Monitor ENGINE (DIAGNOSTICS) 4. READ CURRENT DATA FOR ENGINE (NORMAL MODE) 1) On «Main Menu» display screen, select the {Each System Check} and press the [YES] key. 2) On «System Selection Menu» display screen, select the {Engine Control System} and press the [YES] key.
  • Page 36 Torque Control Signal #1 — Engine torque control signal #2 Torque Control Signal #2 — Torque Permission Sig- Engine torque control permission signal — ON or OFF NOTE: For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL. EN(H4SO)(diag)-34...
  • Page 37 Short term fuel trim #12 On-board diagnostic system OBD System — A/F sensor check A/F sensor — A/F sensor #11 A/F sensor #11 A/F sensor #11 A/F sensor #11 — NOTE: For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL. EN(H4SO)(diag)-35...
  • Page 38 Intake manifold absolute pressure signal Mani. Absolute Pressure mmHg, kPa, inHg or psi Engine speed signal Engine Speed Vehicle speed signal Vehicle Speed km/h or MPH NOTE: For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL. EN(H4SO)(diag)-36...
  • Page 39 ON or OFF signal 2 is entered. Engine torque control permis- When engine torque control Torque Control Permit ON or OFF sion signal permission signal is entered. NOTE: For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL. EN(H4SO)(diag)-37...
  • Page 40 ON or OFF Low clutch timing control solenoid valve Low Clutch Timing Sol. ON or OFF Automatic transmission diagnosis indicator light AT Diagnosis light ON or OFF NOTE: For detailed operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MANUAL. EN(H4SO)(diag)-38...

  • Page 41: Read Diagnostic Trouble Code (Dtc)

    For details concerning DTC, refer to the List of Di- agnostic Trouble Code (DTC). <Ref. 1. SUBARU SELECT MONITOR (NORMAL EN(H4SO)(diag)-74, List of Diagnostic Trouble MODE) Code (DTC).> 1) On «Main Menu» display screen, select the NOTE: {Each System Check} and press the [YES] key.

  • Page 42: Inspection Mode

    Inspection Mode ENGINE (DIAGNOSTICS) 12.Inspection Mode A: OPERATION Carry out trouble diagnosis shown in the following DTC table. When performing trouble diagnosis which is not shown in the DTC table, refer to the next item Drive cycle. <Ref. to EN(H4SO)(diag)-45, Drive Cycle.> Item P0031 HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
  • Page 43 Inspection Mode ENGINE (DIAGNOSTICS) Item P0732 Gear 2 Incorrect Ratio P0733 Gear 3 Incorrect Ratio P0734 Gear 4 Incorrect Ratio P0741 Torque Converter Clutch Circuit Performance or Stuck Off P0743 Torque Converter Clutch Circuit Electrical P0748 Pressure Control Solenoid “A” Electrical P0753 Shift Solenoid “A”...
  • Page 44 12 V or more. 2) Raise the vehicle using a garage jack and place 3) Prepare the Subaru Select Monitor kit. <Ref. to EN(H4SO)(diag)-8, PREPARATION TOOL, Gen- on safety stands or drive the vehicle onto free roll- eral Description.>...
  • Page 45 (on the driver’s side). ru Select Monitor and OBD-II general scan tool. 8) Turn the ignition switch to ON (engine OFF) and Subaru Select Monitor switch to ON. EN-01164 4) Connect the OBD-II general scan tool to its data...
  • Page 46 Inspection Mode ENGINE (DIAGNOSTICS) 7) Depress the brake pedal to turn brake switch ON. (AT models) 8) Keep the engine speed in 2,500 — 3,000 rpm range for 40 seconds. 9) Place the selector lever or shift lever in “D” posi- tion (AT models) or “1st”...

  • Page 47: Drive Cycle

    Drive Cycle ENGINE (DIAGNOSTICS) 13.Drive Cycle A: OPERATION There are three drive patterns for the trouble diagnosis. Driving in the specified pattern allows to diagnose malfunctioning items listed below. After the malfunctioning items listed below are repaired, always check whether they correctly resume their functions by driving in the required drive pattern. 1.
  • Page 48 Drive Cycle ENGINE (DIAGNOSTICS) 4. DRIVE ACCORDING TO THE FOLLOWING DRIVE PATTERN Vehicle speed km/h (MPH) 96 (60) 65 (40) (Seconds) EN-00195 Idle engine for 1 minute. Decelerate with fully closed throt- Accelerate to 96 km/h (60 MPH) tle to 65 km/h (40 MPH). within 10 seconds.

  • Page 49: Clear Memory Mode

    {Clear Memory} and press the [YES] key. 5) When the ‘Done’ and ‘Turn Ignition Switch OFF’ are shown on display screen, turn the ignition switch to OFF, and then turn the Subaru Select Monitor to OFF. NOTE: • After the memory has been cleared, the idle air control solenoid valve must be initialized.

  • Page 50: Compulsory Valve Operation Check Mode

    (1) Data link connector is located in the lower portion of instrument panel (on driver’s side). Check Mode A: OPERATION 1) Prepare the Subaru Select Monitor kit. <Ref. to EN(H4SO)(diag)-8, PREPARATION TOOL, Gen- eral Description.> IM-00072 (2) Connect the diagnosis cable to data link connector.
  • Page 51 Compulsory Valve Operation Check Mode ENGINE (DIAGNOSTICS) 13) Pressing the [NO] key completes the compul- sory operation check mode. The display will then return to the «Actuator ON/OFF Operation» screen. • A list of support data is shown in the following ta- ble.

  • Page 52: Malfunction Indicator Light

    Malfunction Indicator Light ENGINE (DIAGNOSTICS) 16.Malfunction Indicator Light A: PROCEDURE 1. Activation of malfunction indicator light. <Ref. to EN(H4SO)(diag)-51, ACTIVATION OF MALFUNCTION INDICATOR LIGHT, Malfunction Indicator Light.> ↓ 2. Malfunction indicator light does not come on. <Ref. to EN(H4SO)(diag)-52, MALFUNCTION INDICATOR LIGHT DOES NOT COME ON., Malfunction Indicator Light.>...

  • Page 53: Indicator Light

    Malfunction Indicator Light ENGINE (DIAGNOSTICS) B: ACTIVATION OF MALFUNCTION 4) When the ignition switch is turned to ON (engine off) or to “START” with test mode connector con- INDICATOR LIGHT nected, the malfunction indicator light blinks at a 1) When the ignition switch is turned to ON (engine cycle of 3 Hz.

  • Page 54: Wiring Diagram

    Malfunction Indicator Light ENGINE (DIAGNOSTICS) C: MALFUNCTION INDICATOR LIGHT DOES NOT COME ON. • DIAGNOSIS: • The malfunction indicator light circuit is open or shorted. • TROUBLE SYMPTOM: • When the ignition switch is turned ON (engine OFF), malfunction indicator light does not come on. •...
  • Page 55 Malfunction Indicator Light ENGINE (DIAGNOSTICS) Step Check CHECK ECM CONNECTOR. Is the ECM connector correctly Replace the ECM. Repair connection Check the ECM connector connection. connected? <Ref. to of ECM connector. FU(H4SO)-47, Engine Control Module (ECM).> CHECK HARNESS BETWEEN COMBINA- Is the resistance less than 1 Go to step 5.
  • Page 56 • The malfunction indicator light circuit is shorted. • TROUBLE SYMPTOM: • Although malfunction indicator light comes on when the engine runs, DTC is not shown on Subaru se- lect monitor or OBD-II general scan tool display. • WIRING DIAGRAM:...
  • Page 57 Malfunction Indicator Light ENGINE (DIAGNOSTICS) E: MALFUNCTION INDICATOR LIGHT DOES NOT BLINK AT A CYCLE OF 3 HZ. • DIAGNOSIS: • The malfunction indicator light circuit is open or shorted. • Test mode connector circuit is in open. • TROUBLE SYMPTOM: •...
  • Page 58 Malfunction Indicator Light ENGINE (DIAGNOSTICS) Step Check CHECK STATUS OF MALFUNCTION INDI- Dose the malfunction indicator Go to step 2. Repair the mal- CATOR LIGHT. light illuminate? function indicator 1)Turn the ignition switch to OFF. light circuit. <Ref. 2)Disconnect the test mode connector. 3)Turn the ignition switch to ON.
  • Page 59 Malfunction Indicator Light ENGINE (DIAGNOSTICS) F: MALFUNCTION INDICATOR LIGHT REMAINS BLINKING AT A CYCLE OF 3 • DIAGNOSIS: • Test mode connector circuit is shorted. • TROUBLE SYMPTOM: • Malfunction indicator light blinks at a cycle of 3 Hz when the ignition switch is turned to ON. •...
  • Page 60 Malfunction Indicator Light ENGINE (DIAGNOSTICS) Step Check CHECK TEST MODE CONNECTOR. Dose the malfunction indicator Go to step 2. System is in good 1)Disconnect the test mode connector. light blink? order. 2)Turn the ignition switch to ON. NOTE: Malfunction indica- tor light blinks at a cycle of 3 Hz when test mode connec-...

  • Page 61: Diagnostics For Engine Starting Failure

    Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) 17.Diagnostics for Engine Starting Failure A: PROCEDURE 1. Check for fuel amount. ↓ 2. Inspection of starter motor circuit. <Ref. to EN(H4SO)(diag)-60, STARTER MOTOR CIRCUIT, Diagnostics for Engine Start- ing Failure.> ↓ 3. Inspection of ECM power supply and ground line. <Ref. to EN(H4SO)(diag)-63, CONTROL MODULE POWER SUPPLY AND GROUND LINE, Diagnostics for Engine Starting Failure.>...
  • Page 62 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) B: STARTER MOTOR CIRCUIT CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>. • WIRING DIAGRAM: IGNITION SWITCH BATTERY...
  • Page 63 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK BATTERY. Is the voltage more than 12 V? Go to step 2. Charge or replace Check the battery voltage. the battery. CHECK INPUT SIGNAL FOR STARTER MO- Is the voltage more than 10 V? Go to step 3. Go to step 4.
  • Page 64 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK INHIBITOR SWITCH. Is the resistance less than 1 Repair open or Replace the inhibi- Ω? 1)Place the select lever in the “P” or “N” range. ground short cir- tor switch. <Ref. to 2)Measure the resistance between inhibitor cuit in harness 4AT-52, Inhibitor...
  • Page 65 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) C: CONTROL MODULE POWER SUPPLY AND GROUND LINE CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>.
  • Page 66 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK GROUND CIRCUIT OF ECM. Is the resistance less than 5 Go to step 3. Repair open circuit Ω? 1)Disconnect the connector from ECM. in harness 2)Measure the resistance of harness between between ECM ECM and chassis ground.
  • Page 67 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK INPUT VOLTAGE OF ECM. Is the voltage more than 10 V? Check ignition Repair open or 1)Connect the main relay connector. control system. ground short cir- 2)Turn the ignition switch to ON. <Ref.
  • Page 68 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) D: IGNITION CONTROL SYSTEM CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>. • WIRING DIAGRAM: B136 B134 IGNITION...
  • Page 69 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK IGNITION SYSTEM FOR SPARKS. Does spark occur at each cyl- Check fuel pump Go to step 2. 1)Remove the plug cord cap from each spark inder? system. <Ref. to plug. EN(H4SO)(diag)- 2)Install the new spark plug on plug cord cap.
  • Page 70 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND IG- Is the resistance less than 1 Go to step 7. Repair harness Ω? NITION COIL & IGNITOR ASSY CONNEC- and connector. TOR. NOTE: 1)Turn the ignition switch to OFF. In this case, repair 2)Disconnect the connector from ECM.
  • Page 71 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) E: FUEL PUMP CIRCUIT CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>. • WIRING DIAGRAM: SBF-5 IGNITION BATTERY...
  • Page 72 Diagnostics for NOTE: Engine Starting Fuel pump operation can also be executed us- Failure.> ing Subaru Select Monitor. For the procedure, refer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4SO)(diag)-48, Compulsory Valve Oper- ation Check Mode.> CHECK GROUND CIRCUIT OF FUEL PUMP.
  • Page 73 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK FUEL PUMP RELAY. Is the resistance less than 10 Go to step 7. Replace the fuel Ω? 1)Disconnect the connectors from fuel pump pump relay. <Ref. relay and main relay. to FU(H4SO)-49, 2)Remove the fuel pump relay and main relay Fuel Pump...
  • Page 74 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) F: FUEL INJECTOR CIRCUIT CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(diag)-40, OPERATION, Inspection Mode.>. • WIRING DIAGRAM: MAIN RELAY BATTERY SBF-5...
  • Page 75 Diagnostics for Engine Starting Failure ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY TO EACH FUEL Is the voltage more than 10 V? Go to step 3. Repair harness INJECTOR. and connector. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from #1 cylinder In this case, repair fuel injector.

  • Page 76: List Of Diagnostic Trouble Code (Dtc)

    List of Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) 18.List of Diagnostic Trouble Code (DTC) A: LIST Item Index P0030 HO2S Heater Control Circuit (Bank 1 <Ref. to EN(H4SO)(diag)-80, DTC P0030 HO2S HEATER CONTROL CIR- Sensor 1) CUIT (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>...
  • Page 77 List of Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Item Index P0129 Atmospheric Pressure Sensor Circuit <Ref. to EN(H4SO)(diag)-122, DTC P0129 ATMOSPHERIC PRESSURE Range/Performance SENSOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> P0130 O2 Sensor Circuit (Bank 1 Sensor 1) <Ref.
  • Page 78 List of Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Item Index P0400 Exhaust Gas Recirculation Flow <Ref. to EN(H4SO)(diag)-165, DTC P0400 EXHAUST GAS RECIRCULA- TION FLOW, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> P0420 Catalyst System Efficiency Below <Ref. to EN(H4SO)(diag)-168, DTC P0420 CATALYST SYSTEM EFFI- Threshold (Bank 1) CIENCY BELOW THRESHOLD (BANK 1), Diagnostic Procedure with Diag- nostic Trouble Code (DTC).>...
  • Page 79 List of Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Item Index P0705 Transmission Range Sensor Circuit <Ref. to 4AT(diag)-107, CHECK INHIBITOR SWITCH, Diagnostic Procedure (PRNDL Input) without Diagnostic Trouble Code (DTC).> P0710 Transmission Fluid Temperature Sen- <Ref. to 4AT(diag)-44, DTC 27 ATF TEMPERATURE SENSOR, Diagnostic sor Circuit Procedure with Diagnostic Trouble Code (DTC).>...
  • Page 80 List of Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Item Index P1111 Atmospheric Pressure Sensor Circuit <Ref. to EN(H4SO)(diag)-232, DTC P1111 ATMOSPHERIC PRESSURE Malfunction (High Input) SENSOR CIRCUIT MALFUNCTION (HIGH INPUT), Diagnostic Procedure with Diagnostic Trouble Code (DTC).> P1134 A/F Sensor Micro-computer Problem <Ref.
  • Page 81 List of Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Item Index P1518 Starter Switch Circuit Low input <Ref. to EN(H4SO)(diag)-247, DTC P1518 STARTER SWITCH CIRCUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> P1560 Back-up Voltage Circuit Malfunction <Ref. to EN(H4SO)(diag)-250, DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>...

  • Page 82: Diagnostic Procedure With Diagnostic Trouble Code (Dtc)

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) 19.Diagnostic Procedure with Diagnostic Trouble Code (DTC) A: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...

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