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 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.>...
Page 4 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance less than 1 Go to step 2. Repair the open Ω? FRONT OXYGEN (A/F) SENSOR CONNEC- circuit in harness TOR. between ECM and 1)Start the engine and warm-up engine.
Page 5 13 14 15 16 EN-01421 Step Check CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni- Go to step 2. Go to step 5. tor or OBD-II general scan tool display DTC P0031 and P0037 at the same time?
Page 6 Go to step 5. 1)Start the engine. tact in connector. 2)Read the data of front oxygen (A/F) sensor NOTE: heater current using Subaru Select Monitor or In this case, repair OBD-II general scan tool. the following: • Poor contact in NOTE: •Subaru Select Monitor...
Page 7 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK FRONT OXYGEN (A/F) SENSOR. Is the resistance less than 10 Repair harness Replace the front Ω? 1)Turn the ignition switch to OFF. and connector. oxygen (A/F) sen- 2)Measure the resistance between front oxy- sor.
Page 8 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) C: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 9 Module (ECM).> connector. 3)Turn the ignition switch to ON. 4)Read the data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or the OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.
Page 10 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) D: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2) • 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.>...
Page 11 Is the current more than 0.2 A? Repair the con- Go to step 3. 1)Start the engine. nector. 2)Read the data of rear oxygen sensor heater NOTE: current using Subaru Select Monitor or OBD-II In this case, repair general scan tool. the following: • Poor contact in NOTE: •Subaru Select Monitor...
Page 12 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY TO REAR OXY- Is the voltage more than 10 V? Go to step 7. Repair power sup- GEN SENSOR. ply line. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from rear oxygen In this case, repair...
Page 13 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) E: DTC P0038 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2) • 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.>...
Page 14 Engine Control tor. Module (ECM).> 3)Turn the ignition switch to ON. 4)Read the data of rear oxygen sensor heater current using Subaru Select Monitor or the OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.
Page 15 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) F: DTC P0066 AIR ASSISTED INJECTOR CONTROL CIRCUIT OR CIRCUIT • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 16 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Repair poor con- Go to step 2. 1)Turn ignition switch to ON. tact in ECM con- 2)Measure voltage between ECM and chassis nector.
Page 17 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) G: DTC P0067 AIR ASSISTED INJECTOR CONTROL CIRCUIT HIGH • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 18 CHECK OUTPUT SIGNAL FROM ECM. Does the voltage change by Repair battery Contact with your Measure voltage between ECM and chassis shaking the ECM harness and short circuit in har- Subaru distributor ground. connector? ness between service. Connector & terminal ECM and air assist NOTE: (B134) No.
Page 19 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) H: DTC P0107 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT LOW INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 20 Go to step 2. 1)Start the engine. than 13.3 kPa (100 mmHg, 2)Read the data of intake manifold absolute 3.94 inHg)? pressure signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.
Page 21 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN MANIFOLD Is the voltage more than 4.5 V? Go to step 8. Repair open circuit ABSOLUTE PRESSURE SENSOR AND ECM in harness CONNECTOR. between ECM and 1)Turn the ignition switch to OFF.
Page 22 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) I: DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT HIGH INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 23 Go to step 2. 1)Start the engine. than 119.5 kPa (896.5 mmHg, 2)Read the data of intake manifold absolute 35.29 inHg)? pressure signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.
Page 24 CONNECTOR. 35.29 inHg)? ness between sure sensor. <Ref. 1)Turn the ignition switch to OFF and Subaru ECM and manifold to FU(H4SO)-33, Select Monitor or the OBD-II general scan tool absolute pressure Manifold Absolute switch to OFF.
Page 25 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) J: DTC P0111 INTAKE AIR TEMPERATURE CIRCUIT RANGE/PERFORMANCE • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 26 1)Start the engine and warm it up completely. (203°F)? sensor. <Ref. to of Diagnostic 2)Measure the engine coolant temperature FU(H4SO)-34, Trouble Code using Subaru Select Monitor or OBD-II general Intake Air Temper- (DTC)”. <Ref. to scan tool. ature Sensor.> EN(H4SO)(diag)- 74, List of Diag-...
Page 27 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) K: DTC P0112 INTAKE AIR TEMPERATURE CIRCUIT LOW INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 28 1)Start the engine. more than 120°C (248°F)? tact. 2)Read the data of intake air temperature sen- NOTE: sor signal using Subaru Select Monitor or the In this case, repair OBD-II general scan tool. the following: • Poor contact in NOTE: •Subaru Select Monitor...
Page 29 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) L: DTC P0113 INTAKE AIR TEMPERATURE CIRCUIT HIGH INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 30 −40°C (−40°F)? 1)Start the engine. tact. 2)Read the data of intake air temperature sen- NOTE: sor signal using Subaru Select Monitor or the In this case, repair OBD-II general scan tool. the following: • Poor contact in NOTE: •Subaru Select Monitor...
Page 31 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN INTAKE AIR Is the resistance less than 5 Replace the intake Repair harness Ω? TEMPERATURE SENSOR AND ECM CON- air temperature and connector. NECTOR. sensor. <Ref. to NOTE: 1)Turn the ignition switch to OFF.
Page 32 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) M: DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Hard to start • Erroneous idling • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 33 Repair poor con- 1)Start the engine. ture more than 150°C (302°F)? tact. 2)Read the data of engine coolant temperature NOTE: sensor signal using Subaru Select Monitor or In this case, repair OBD-II general scan tool. the following: • Poor contact in NOTE: •Subaru Select Monitor...
Page 34 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) N: DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Hard to start • Erroneous idling • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 35 Repair poor con- ture less than −40°C (−40°F)? 1)Start the engine. tact. 2)Read the data of engine coolant temperature NOTE: sensor signal using Subaru Select Monitor or In this case, repair OBD-II general scan tool. the following: • Poor contact in NOTE: •Subaru Select Monitor...
Page 36 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ENGINE Is the resistance less than 5 Replace the Repair harness Ω? COOLANT TEMPERATURE SENSOR AND engine coolant and connector. ECM CONNECTOR. temperature sen- NOTE: 1)Turn the ignition switch to OFF. sor.
Page 37 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) O: DTC P0121 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT RANGE/PERFORMANCE • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 38 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC Replace the throt- P0122 or P0123 tle position sen- using “List of Diag- sor. <Ref. to nostic Trouble FU(H4SO)-31, Code (DTC)”.
Page 39 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) P: DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT LOW INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 40 Even if malfunction 1)Start the engine. indicator light 2)Read the data of throttle position sensor sig- lights up, the cir- nal using Subaru Select Monitor or OBD-II cuit has returned general scan tool. to a normal condi- tion at this time. A...
Page 41 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage more than 4.5 V? Go to step 7. Repair harness THROTTLE POSITION SENSOR CONNEC- and connector. TOR. NOTE: 1)Turn the ignition switch to OFF. In this case, repair 2)Disconnect the connectors from throttle posi- the following:...
Page 42 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Q: DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT HIGH INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 43 Even if malfunction 1)Start the engine. indicator light 2)Read the data of throttle position sensor sig- lights up, the cir- nal using Subaru Select Monitor or OBD-II cuit has returned general scan tool. to a normal condi- tion at this time. A...
Page 44 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) R: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine would not return to idling. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 45 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 46 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) T: DTC P0130 O2 SENSOR CIRCUIT (BANK 1 SENSOR 1) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 47 70°C (160°F). If the engine is already warmed-up, operate at idle speed for at least 1 minute. 3)Read the data of front oxygen (A/F) sensor signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.
Page 48 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK EXHAUST SYSTEM. Is there a fault in exhaust sys- Repair or replace Replace the front Check exhaust system parts. tem? faulty parts. oxygen (A/F) sen- sor. <Ref. to NOTE: FU(H4SO)-43, Check the following items.
Page 49 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) U: DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 50 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance more than 1 Replace the front Repair ground FRONT OXYGEN (A/F) SENSOR CONNEC- MΩ? oxygen (A/F) sen- short circuit in har- TOR.
Page 51 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) V: DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 52 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage more than 8 V? Replace the front Repair battery FRONT OXYGEN (A/F) SENSOR CONNEC- oxygen (A/F) sen- short circuit in har- TOR.
Page 53 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) W: DTC P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (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.>...
Page 54 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 55 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) X: DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SEN- SOR 1) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 56 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance less than 1 Go to step 2. Repair harness Ω? FRONT OXYGEN (A/F) SENSOR CONNEC- and connector. TOR. NOTE: 1)Turn the ignition switch to OFF. In this case, repair 2)Disconnect the connectors from ECM and the following:...
Page 57 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Y: DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2) • 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.>...
Page 58 1)Warm-up the engine until engine coolant temperature is above 70°C (158°F), and keep the engine speed at 5,000 rpm for two minutes. 2)Read the data of rear oxygen sensor signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA SHOWN ON DIS-...
Page 59 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK EXHAUST SYSTEM. Is there a fault in exhaust sys- Repair or replace Replace the rear Check exhaust system parts. tem? faulty parts. oxygen sensor. <Ref. to NOTE: FU(H4SO)-43, Check the following items.
Page 60 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Z: DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2) • 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.>...
Page 61 70°C (158°F), and imme- diately decrease the engine speed from 5,000 rpm. 2)Read the data of rear oxygen sensor signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA SHOWN ON DIS-...
Page 62 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK EXHAUST SYSTEM. Is there a fault in exhaust sys- Repair or replace Replace the rear Check exhaust system parts. tem? faulty parts. oxygen sensor. <Ref. to NOTE: FU(H4SO)-43, Check the following items.
Page 63 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AA:DTC P0139 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2) • 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.>...
Page 64 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check DTC using Replace the rear “List of Diagnostic oxygen sensor. Trouble Code <Ref. to (DTC)”. <Ref. to FU(H4SO)-43, EN(H4SO)(diag)- Front Oxygen (A/...
Page 65 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AC:DTC P0172 SYSTEM TOO RICH (BANK 1) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 66 70 — 100°C (158 — engine coolant 1)Start the engine and warm-up completely. 212°F)? temperature sen- 2)Read the data of engine coolant temperature sor. <Ref. to sensor signal using Subaru Select Monitor or FU(H4SO)-27, OBD-II general scan tool. Engine Coolant Temperature Sen- NOTE: sor.>...
Page 67 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AD:DTC P0301 CYLINDER 1 MISFIRE DETECTED NOTE: For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO)(diag)-145, DTC P0304 CYLINDER 4 MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> AE:DTC P0302 CYLINDER 2 MISFIRE DETECTED NOTE: For the diagnostic procedure, refer to DTC P0304.
Page 68 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AG:DTC P0304 CYLINDER 4 MISFIRE DETECTED • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • Immediately at fault recognition (A misfire which could damage catalyst occurs.) • TROUBLE SYMPTOM: •...
Page 69 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 70 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY LINE. Is the voltage more than 10 V? Repair poor con- Repair harness 1)Turn the ignition switch to ON. tact in all connec- and connector. 2)Measure the voltage between fuel injector tors in fuel injector NOTE: and engine ground on faulty cylinders.
Page 71 Does the malfunction indicator Go to step 15. Go to step 14. CATOR LIGHT. light illuminate or blink? 1)Clear the memory using Subaru Select Mon- itor. <Ref. to EN(H4SO)(diag)-47, Clear Memory Mode.> 2)Start the engine, and drive the vehicle more than 10 minutes.
Page 72 • Are there cracks or any disconnec- tion of hoses? CHECK MISFIRE SYMPTOM. Does the Subaru Select Moni- Go to step 21. Go to step 17. 1)Turn the ignition switch to ON. tor or OBD-II general scan tool 2)Read the DTC.
Page 73 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check GROUP OF #1 AND #2 CYLINDERS Are there faults in #1 and #2 Repair or replace Go to DTC P0171. cylinders? faulty parts. <Ref. to EN(H4SO)(diag)- NOTE: 141, DTC P0171 •...
Page 74 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check GROUP OF #2 AND #4 CYLINDERS Are there faults in #2 and #4 Repair or replace Go to DTC P0171. cylinders? faulty parts. <Ref. to EN(H4SO)(diag)- NOTE: 141, DTC P0171 Check the follow- SYSTEM TOO ing items.
Page 75 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AH:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Poor driving performance • Knocking occurs. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 76 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN KNOCK SEN- Is the resistance more than Go to step 2. Repair harness SOR AND ECM CONNECTOR. 700 kΩ? and connector. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from ECM.
Page 77 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AI: DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1 OR SINGLE SENSOR) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Poor driving performance • Knocking occurs. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 78 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN KNOCK SEN- Is the resistance less than 400 Go to step 2. Go to step 3. SOR AND ECM CONNECTOR. kΩ? Measure the resistance of harness between ECM connector and chassis ground.
Page 79 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AJ:DTC P0335 CRANKSHAFT POSITION SENSOR “A” CIRCUIT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Engine stalls. • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 80 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN CRANK- Is the resistance more than Repair harness Go to step 2. SHAFT POSITION SENSOR AND ECM CON- 100 kΩ? and connector. NECTOR. NOTE: 1)Turn the ignition switch to OFF. In this case, repair 2)Disconnect the connector from crankshaft the following:...
Page 81 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AK:DTC P0336 CRANKSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PER- FORMANCE • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Engine stalls. • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 82 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 83 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AL:DTC P0340 CAMSHAFT POSITION SENSOR “A” CIRCUIT (BANK 1 OR SIN- GLE SENSOR) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Engine stalls. • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 84 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN CAMSHAFT Is the resistance more than Repair harness Go to step 2. POSITION SENSOR AND ECM CONNEC- 100 kΩ? and connector. TOR. NOTE: 1)Turn the ignition switch to OFF. In this case, repair 2)Disconnect the connector from camshaft the following:...
Page 85 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AM:DTC P0341 CAMSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PERFOR- MANCE (BANK 1 OR SINGLE SENSOR) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Engine stalls. • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 86 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 87 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK CONDITION OF CAMSHAFT POSI- Is the camshaft position sensor Go to step 8. Tighten camshaft TION SENSOR. installation bolt tightened position sensor Turn the ignition switch to OFF. securely? installation bolt securely.
Page 88 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AN:DTC P0400 EXHAUST GAS RECIRCULATION FLOW • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Poor driving performance on low engine speed • Erroneous idling •...
Page 89 1)Start engine. than 53.3 kPa (400 mmHg, valve, intake mani- 2)Rear the data of intake manifold absolute 15.75 inHg)? fold pressure sen- pressure signal using Subaru Select Monitor or sor and throttle OBD-II general scan tool. body are securely installed. NOTE: •Subaru Select Monitor...
Page 90 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN EGR SOLE- Is the resistance less than 1 Go to step 7. Repair the open Ω? NOID VALVE AND ECM CONNECTOR. circuit in harness 1)Turn the ignition switch to OFF. between ECM and 2)Disconnect the connectors from EGR sole- EGR solenoid...
Page 91 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AO:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine stalls. • Idle mixture is out of specifications. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 92 2)Measure the resistance between rear oxy- sor. gen sensor connector and ECM connector. Connector & terminal (B19) No. 3 — (B135) No. 19: CHECK SHIELD HARNESS. Is the shield harness opened? Repair the shield Contact with your harness. Subaru distributor service. EN(H4SO)(diag)-169...
Page 93 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AP:DTC P0458 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON- TROL VALVE CIRCUIT LOW • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 94 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Even if malfunction Go to step 2. 1)Turn the ignition switch to ON. indicator light 2)Measure the voltage between ECM and lights up, the cir- chassis ground.
Page 95 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POOR CONTACT. Is there poor contact in purge Repair poor con- Contact with SUB- Check poor contact in purge control solenoid control solenoid valve connec- tact in purge con- ARU distributor valve connector.
Page 96 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AQ:DTC P0459 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CON- TROL VALVE CIRCUIT HIGH • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 97 ECM chassis ground. connector. NOTE: Purge control solenoid valve operation can be executed using Subaru Select Monitor. For pro- cedure, refer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4SO)(diag)-48, Compulsory Valve Operation Check Mode.> Connector & terminal (B134) No.
Page 98 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AR:DTC P0462 FUEL LEVEL SENSOR CIRCUIT LOW INPUT • 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.>...
Page 99 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BATTERY No.13 SBF-4 SBF-1 IGNITION SWITCH 1 2 3 COMBINATION METER 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 B135 ECM 1 2 3...
Page 100 •Subaru Select Monitor temporary poor For detailed operation procedure, refer to the contact of the con- “READ CURRENT DATA FOR ENGINE”. nector may be the <Ref. to EN(H4SO)(diag)-32, Subaru Select cause. Monitor.> NOTE: In this case, repair the following: • Poor contact in...
Page 101 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check Is the resistance 0.5 — 2.5 Ω? Repair poor con- CHECK FUEL LEVEL SENSOR. Replace the fuel 1)Remove the fuel pump assembly. <Ref. to tact in harness level sensor. FU(H4SO)-57, Fuel Pump.>...
Page 102 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AS:DTC P0463 FUEL LEVEL SENSOR CIRCUIT HIGH INPUT • 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.>...
Page 103 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BATTERY No.13 SBF-4 SBF-1 IGNITION SWITCH 1 2 3 COMBINATION METER 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 B135 ECM 1 2 3...
Page 104 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INPUT SIGNAL FOR ECM. Is the voltage more than 4.75 Go to step 3. Even if malfunction 1)Turn the ignition switch to ON. (Engine OFF) indicator light 2)Measure the voltage between ECM connec- lights up, the cir- tor and chassis ground.
Page 105 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK FUEL LEVEL SENSOR. Is the resistance more than Replace the fuel Replace the com- 54.5 Ω? 1)Remove the fuel pump assembly. <Ref. to level sensor. <Ref. bination meter. FU(H4SO)-57, Fuel Pump.>...
Page 106 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AT:DTC P0483 COOLING FAN RATIONALITY CHECK • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Occurrence of noise • Overheating CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 107: Wiring Diagram
Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH No.17 SBF-4 No.18 AIR CONDITIONING AIR CONDITIONING RELAY HOLDER RELAY HOLDER MAIN RELAY RELAY MAIN FAN SUB FAN MOTOR MOTOR B225 B134 ECM 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 B134 5 6 7...
Page 108 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect the rele- Check the radiator vant DTC using fan motor connec- “List of Diagnostic tor for connecting Trouble Code condition.
Page 109 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AV:DTC P0503 VEHICLE SPEED SENSOR INTERMITTENT/ERRATIC/HIGH • DTC DETECTING CONDITION: • Immediately at fault recognition 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 110 CHECK TRANSMISSION TYPE. Is the target AT model? Go to step 2. Go to step 3. CHECK DTC P0720 ON DISPLAY. Does the Subaru Select Moni- Check front vehi- Go to step 3. tor or OBD-II general scan tool cle speed sensor indicate DTC P0720? signal circuit.
Page 111 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AW:DTC P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine is difficult to start. • Engine does not start. •...
Page 112 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 113 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AX:DTC P0507 IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine keeps running at higher revolution than specified idling revolution. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 114 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 115 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AY:DTC P0512 STARTER REQUEST CIRCUIT • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 116 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: IGNITION SWITCH BATTERY SBF-4 SBF-1 : AT MODEL : MT MODEL : WITH SECURITY EXCEPT FOR AUSTRALIA MODEL : WITH SECURITY FOR AUSTRALIA MODEL AND WITHOUT SECURITY B323 INHIBITOR SWITCH STARTER MOTOR...
Page 117 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OPERATION OF STARTER MOTOR. Dose the starter motor oper- Repair battery Check starter Turn the ignition switch to ON. ate? short circuit in motor circuit. <Ref. starter motor cir- NOTE: cuit.
Page 118 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AZ:DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Engine keeps running at higher revolution than specified idling revolution. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 119 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 120 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BB:DTC P0559 GENERATOR CIRCUIT HIGH INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition 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, Inspection Mode.>.
Page 121 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN GENERATOR Is the resistance more than 1 Go to step 2. Repair the ground AND ECM CONNECTOR. MΩ? short circuit in har- 1)Turn the ignition switch to OFF. ness between 2)Disconnect the connectors from generator ECM and purge...
Page 122 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BC:DTC P0562 SYSTEM VOLTAGE LOW • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Charge warning light comes on. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 123 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK GENERATOR. Is the voltage more than 10.8 Go to step 2. Repair the genera- 1)Start the engine. tor. <Ref. to 2)Idle after warm-up. SC(H4SO)-13, 3)Measure the voltage between generator B Generator.>...
Page 124 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BD:DTC P0563 SYSTEM VOLTAGE HIGH • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Charge warning light comes on. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 125 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK GENERATOR. Is the voltage less than 16.2 Go to step 2. Repair the genera- 1)Start the engine. tor. <Ref. to 2)Idle after warm-up. SC(H4SO)-13, 3)Measure the voltage between generator B Generator.>...
Page 126 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BE:DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Engine does not start. • Engine stalls. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 127 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the rele- A temporary poor vant DTC using contact occurs. the List of Diag- nostic Trouble Code (DTC). <Ref. EN(H4SO)(diag)- 74, List of Diag- nostic Trouble...
Page 128 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BF:DTC P0691 COOLING FAN 1 CONTROL CIRCUIT LOW • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Radiator fan does not operate properly. • Overheating CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 129 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH No.17 SBF-4 No.18 AIR CONDITIONING AIR CONDITIONING RELAY HOLDER RELAY HOLDER MAIN RELAY RELAY MAIN FAN SUB FAN MOTOR MOTOR B225 B134 ECM 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 B134 5 6 7...
Page 130 4)While operating the radiator fan relay, mea- sure voltage between ECM terminal and ground. NOTE: Radiator fan relay operation can be executed using Subaru Select Monitor. For procedure, refer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4SO)(diag)-32, Subaru Select Monitor.> Connector & terminal (B134) No.
Page 131 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BG:DTC P0692 COOLING FAN 1 CONTROL CIRCUIT HIGH • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Radiator fan does not operate properly. • Overheating CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 132 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH No.17 SBF-4 No.18 AIR CONDITIONING AIR CONDITIONING RELAY HOLDER RELAY HOLDER MAIN RELAY RELAY MAIN FAN SUB FAN MOTOR MOTOR B225 B134 ECM 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 B134 5 6 7...
Page 133 ECM connector. NOTE: Radiator fan relay operation can be executed using Subaru Select Monitor. For procedure, refer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4SO)(diag)-48, Compul- sory Valve Operation Check Mode.> Connector & terminal (B134) No. 14 (+) — Chassis ground ( − − − − ): (B134) No.
Page 134 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BH:DTC P0703 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT • 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.>...
Page 135 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN TCM AND Is the resistance less than 1 Go to step 3. Repair or replace Ω? BRAKE LIGHT SWITCH CONNECTOR. the harness and 1)Disconnect the connectors from TCM and connector.
Page 136 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BI: DTC P0731 GEAR 1 INCORRECT RATIO NOTE: For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)(diag)-214, DTC P0734 GEAR 4 IN- CORRECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> BJ:DTC P0732 GEAR 2 INCORRECT RATIO NOTE: For the diagnostic procedure, refer to DTC P0734.
Page 137 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BL:DTC P0734 GEAR 4 INCORRECT RATIO • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Shift point too high or too low; engine brake not effected in “3” range; excessive shift shock; excessive tight corner “braking”...
Page 138 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BM:DTC P0741 TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE OR STUCK OFF • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • No lock-up (after engine warm-up) • No shift or excessive tight corner “braking” CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 139 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ATF TEMPERATURE SENSOR CIR- Is there any trouble in ATF tem- Repair or replace Go to step 9. CUIT. perature sensor circuit? the ATF tempera- Check ATF temperature sensor circuit. <Ref. ture sensor circuit.
Page 140 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BN:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 141 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC Go to step 2. P0705 using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 142 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BO:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (AT VEHICLES) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 143 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INPUT SIGNAL FOR ECM. Is the voltage more than 10 V? Go to step 2. Go to step 4. 1)Turn the ignition switch to ON. 2)Place the shift lever in neutral. 3)Measure the voltage between ECM and chassis ground.
Page 144 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BP:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (AT MODEL) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 145 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect DTC using Go to step 2. “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble Code (DTC).>...
Page 146 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INHIBITOR SWITCH GROUND LINE. Is the resistance less than 5 Go to step 8. Repair open circuit Ω? Measure the resistance of harness between in harness inhibitor switch connector and engine ground. between inhibitor Connector &...
Page 147 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BQ:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 148 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INPUT SIGNAL FOR ECM. Is the voltage less than 1 V? Go to step 2. Go to step 4. 1)Turn the ignition switch to ON. 2)Set the shift lever to except neutral position. 3)Measure the voltage between ECM and chassis ground.
Page 149 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BR:DTC P0864 TCM COMMUNICATION CIRCUIT RANGE/PERFORMANCE • 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.>...
Page 150 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ACCESSORY. Are car phone and/or CB Repair grounding Replace the TCM. installed on vehicle? line of car phone <Ref. to 4AT-74, or CB system. Transmission Con- trol Module (TCM).>...
Page 151 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BS:DTC P0865 TCM COMMUNICATION CIRCUIT LOW • 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.>...
Page 152 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage less than 1 V? Go to step 2. Even if malfunction TCM CONNECTOR. indicator light 1)Turn the ignition switch to ON. lights up, the cir- 2)Measure the voltage between ECM and cuit has returned...
Page 153 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BT:DTC P0866 TCM COMMUNICATION CIRCUIT HIGH • 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.>...
Page 154 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage more than 4 V? Go to step 5. Go to step 3. TCM CONNECTOR. Measure the voltage between ECM connector and chassis ground. Connector &...
Page 155 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BU:DTC P1110 ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNCTION (LOW INPUT) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 156 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BW:DTC P1134 A/F SENSOR MICRO-COMPUTER PROBLEM • 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.>...
Page 157 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check DTC using Replace the ECM. the List of Diag- <Ref. to nostic Trouble FU(H4SO)-47, Code (DTC). <Ref. Engine Control Module (ECM).>...
Page 158 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BX:DTC P1137 O2 SENSOR CIRCUIT (LAMDA=1) (BANK1 SENSOR1) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 159 If the engine is already warmed-up, operate at idle speed for at least 1 minute. 3)Read the data of front oxygen (A/F) sensor signal during idling using Subaru Select Moni- tor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.
Page 160 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BY:DTC P1492 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT) NOTE: For the diagnostic procedure, refer to DTC P1498. <Ref. to EN(H4SO)(diag)-238, DTC P1498 EGR SOLE- NOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>...
Page 161 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CE:DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Poor driving performance. • Engine breathing CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 162 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY TO EGR SOLE- Is the voltage more than 10 V? Go to step 2. Repair harness NOID VALVE. and connector. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from EGR sole- In this case, repair...
Page 163 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CF:DTC P1499 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Poor driving performance. • Engine breathing CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 164 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the DTC Go to step 2. using the List of Diagnostic Trou- ble Code (DTC). <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble...
Page 165 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CG:DTC P1510 ISC SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION (LOW INPUT) NOTE: For the diagnostic procedure, refer to DTC P1516. <Ref. to EN(H4SO)(diag)-243, DTC P1516 ISC SOLE- NOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>...
Page 166 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CM:DTC P1516 ISC SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Engine breathing CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 167 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY TO IDLE AIR CON- Is the voltage more than 10 V? Go to step 2. Repair harness TROL SOLENOID VALVE. and connector. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from idle air con- In this case, repair...
Page 168 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CN:DTC P1517 ISC SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Engine breathing CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
Page 169 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check the DTC Go to step 2. using the List of Diagnostic Trou- ble Code (DTC). <Ref. to EN(H4SO)(diag)- 74, List of Diag- nostic Trouble...
Page 170 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CO:DTC P1518 STARTER SWITCH CIRCUIT LOW INPUT • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 171 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: IGNITION SWITCH BATTERY SBF-4 SBF-1 : AT MODEL : MT MODEL : WITH SECURITY EXCEPT FOR AUSTRALIA MODEL : WITH SECURITY FOR AUSTRALIA MODEL AND WITHOUT SECURITY B323 INHIBITOR SWITCH STARTER MOTOR...
Page 172 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OPERATION OF STARTER MOTOR. Does the starter motor operate Repair harness Check starter Place the inhibitor switch in the “P” or “N” when ignition switch is turned and connector. motor circuit.
Page 173 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CP:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION • DTC DETECTING CONDITION: • Immediately at fault recognition 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 174 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance less than 10 Repair ground Go to step 3. Ω? MAIN FUSE BOX CONNECTOR. short circuit in har- 1)Disconnect the negative terminal from bat- ness between tery, and then disconnect the positive terminal.
Page 175 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CQ:DTC P1698 ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT LOW INPUT • 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.>...
Page 176 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 3 V? Repair poor con- Go to step 2. 1)Start the engine, and warm-up the engine. tact in ECM con- 2)Turn the ignition switch to OFF.
Page 177 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CR:DTC P1699 ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT HIGH INPUT • 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.>...
Page 178 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage less than 3 V? Go to step 2. Repair battery 1)Start the engine, and warm-up the engine. short circuit in har- 2)Turn the ignition switch to OFF.
Page 179 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CS:DTC P1711 ENGINE TORQUE CONTROL SIGNAL 1 CIRCUIT MALFUNC- TION • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Excessive shift shock CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 180 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INPUT SIGNAL FOR ECM. Is the voltage more than 4.5 V? Go to step 2. Go to step 4. 1)Turn the ignition switch to ON. 2)Measure the voltage between ECM and chassis ground.
Page 181 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CT:DTC P1712 ENGINE TORQUE CONTROL SIGNAL 2 CIRCUIT MALFUNCTION • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Excessive shift shock CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.>...
Page 182 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INPUT SIGNAL FOR ECM. Is the voltage more than 4.5 V? Go to step 2. Go to step 4. 1)Turn the ignition switch to ON. 2)Measure the voltage between ECM and chassis ground.
Page 183: General Diagnostic Table
General Diagnostic Table ENGINE (DIAGNOSTICS) 20.General Diagnostic Table A: INSPECTION 1. ENGINE NOTE: Malfunction of parts other than those listed is also possible. <Ref. to ME(H4SO)-89, Engine Trouble in Gen- eral.> Symptom Problem parts 1) Idle air control solenoid valve 2) Manifold absolute pressure sensor 3) Intake air temperature sensor 4) Ignition parts (*1)
Page 184: Automatic Transmission
General Diagnostic Table ENGINE (DIAGNOSTICS) Symptom Problem parts 1) Intake manifold pressure sensor 2) Intake air temperature sensor 3) Manifold absolute pressure sensor 4) Engine coolant temperature sensor (*2) 6. Surge 5) Crankshaft position sensor (*3) 6) Camshaft position sensor (*3) 7) Fuel injection parts (*4) 8) Throttle position sensor 9) Fuel pump and fuel pump relay...
Page 185 General Diagnostic Table ENGINE (DIAGNOSTICS) EN(H4SO)(diag)-262...

Subaru IMPREZA 2004 Service Manual

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ENGINE SECTION 1

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Summary of Contents for Subaru IMPREZA 2004

Page 1: Engine Section

Page 107: Wiring Diagram

Page 183: General Diagnostic Table

Page 184: Automatic Transmission