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Subaru Impreza 2004 Service Manual

Engine section 2
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2004 IMPREZA SERVICE MANUAL

ENGINE SECTION 2

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)
FU(H4DOTC)
EC(H4DOTC)
IN(H4DOTC)
ME(H4DOTC)
EX(H4DOTC)
CO(H4DOTC)
LU(H4DOTC)
SP(H4DOTC)
IG(H4DOTC)
SC(H4DOTC)
EN(H4DOTC)(diag)
G1870GE3

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Summary of Contents for Subaru Impreza 2004

  • Page 1: Engine Section

    EC(H4DOTC) (AUX. EMISSION CONTROL DEVICES) INTAKE (INDUCTION) IN(H4DOTC) MECHANICAL ME(H4DOTC) This service manual has been prepared to provide SUBARU service personnel EXHAUST EX(H4DOTC) with the necessary information and data for the correct maintenance and repair of SUBARU vehicles. COOLING CO(H4DOTC)
  • Page 2 Subaru Select Monitor and OBD-II general 10%? sage. • Engine oil scan tool. Replace the (amount, con-...
  • Page 3 Subaru Select Monitor and OBD-II general 10%? sage. • Engine oil scan tool. Replace the (amount, con-...

  • Page 4: Lhd

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) C: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 5 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 6: Lhd

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) D: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 7 Is the current more than 0.2 A? Repair the poor Go to step 4. 1)Start the engine. contact in connec- 2)Read the data of front oxygen (A/F) sensor tor. heater current using Subaru Select Monitor or NOTE: OBD-II general scan tool. In this case, repair the following: NOTE: •Subaru Select Monitor...
  • Page 8 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Shake the ECM harness and Repair the poor Go to step 8. Measure the voltage between ECM connector connector, while monitoring contact in ECM and chassis ground.

  • Page 9: Lhd 4 5

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) E: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 10 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 11: Table Of Contents

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) F: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 12 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 13 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 the power GEN SENSOR. supply line. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from rear oxygen In this case, repair...

  • Page 14: (Rhd)

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) G: DTC P0038 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 15 Engine Control 2)Turn the ignition switch to ON. Module (ECM).> 3)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 16 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) H: DTC P0068 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT RANGE/PERFORMANCE • 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 17 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model THROTTLE BODY MANIFOLD ABSOLUTE PRESSURE SENSOR B135 B135 1 2 3 1 2 3 4 5 6 11 12 13 14 15 16 17 18 19 9 10 11 12 20 21 26 27 28...
  • Page 18 Check the throttle 1)Turn the ignition switch to ON. Signal} come on? position sensor cir- 2)Operate the LED operation mode for engine cuit. <Ref. to using Subaru Select Monitor. EN(H4DOTC)(dia g)-121, DTC NOTE: P0121 THROT- •Subaru Select Monitor TLE/PEDAL POSI-...
  • Page 19 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) I: DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFOR- MANCE • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. •...
  • Page 20 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- Replace the mass vant DTC using air flow and intake “List of Diagnostic air temperature Trouble Code sensor.
  • Page 21 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) J: DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Poor driving performance •...

  • Page 22: En(H4Dotc)(Diag)

    2)Connect the Subaru Select Monitor or OBD- to a normal condi- II general scan tool to data link connector. tion at this time. A 3)Turn the ignition switch to ON and Subaru temporary poor Select Monitor or the OBD-II general scan tool contact of the con- switch to ON.
  • Page 23 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 6. Repair the open Ω? MASS AIR FLOW SENSOR CONNECTOR. circuit between 1)Turn the ignition switch to OFF. ECM and mass air 2)Disconnect the connector from ECM.
  • Page 24 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) K: DTC P0103 MASS OR VOLUME AIR FLOW 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 25 2)Connect the Subaru Select Monitor or OBD- to a normal condi- II general scan tool to data link connector. tion at this time. 3)Turn the ignition switch to ON and Subaru Select Monitor or OBD-II general scan tool switch to ON. 4)Start the engine.
  • Page 26 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) L: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 27 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model THROTTLE BODY MANIFOLD ABSOLUTE PRESSURE SENSOR B135 B135 1 2 3 1 2 3 4 5 6 11 12 13 14 15 16 17 18 19 9 10 11 12 20 21 26 27 28...
  • Page 28 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK INPUT SIGNAL FOR ECM. Is the voltage less than 0.7 V? Go to step 4. Contact your Sub- Measure the voltage between ECM and chas- aru distributor ser- sis ground.
  • Page 29 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) M: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 30 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model THROTTLE BODY MANIFOLD ABSOLUTE PRESSURE SENSOR B135 B135 1 2 3 1 2 3 4 5 6 11 12 13 14 15 16 17 18 19 9 10 11 12 20 21 26 27 28...
  • Page 31 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 4. Contact your Sub- Measure the voltage between ECM connector aru distributor ser- and chassis ground. vice.
  • Page 32 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) N: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 33 Repair the poor 1)Start the engine. 55°C (131°F)? contact. 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 NOTE: •Subaru Select Monitor...
  • Page 34 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) O: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 35 Repair the poor −36°C (−33°F)? 1)Start the engine. contact. 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 36 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN MASS AIR Is the resistance less than 5 Replace the mass Repair the har- Ω? FLOW AND INTAKE AIR TEMPERATURE air flow and intake ness and connec- SENSOR AND ECM CONNECTOR.
  • Page 37 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) P: 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 38 Repair the poor 1)Start the engine. 120°C (248°F)? contact. 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 39 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Q: 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 40: En(H4Dotc)(Diag)

    Repair the poor −40°C (−40°F)? 1)Start the engine. contact. 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 41 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ENGINE Is the resistance less than 5 Replace the Repair the har- Ω? COOLANT TEMPERATURE SENSOR AND engine coolant ness and connec- ECM CONNECTOR. temperature sen- tor.
  • Page 42 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) R: 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 •...
  • Page 43 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model THROTTLE POSITION SENSOR 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 44 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) S: 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 45 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model THROTTLE POSITION SENSOR 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 46 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 47 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 the har- THROTTLE POSITION SENSOR CONNEC- ness and connec- TOR. tor. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connectors from throttle posi- In this case, repair...
  • Page 48 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) T: 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 49 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model THROTTLE POSITION SENSOR 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 50 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 51 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) U: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine will not return to idling. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
  • Page 52 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 53 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) W: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 54 70°C (158°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 55 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) X: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 56 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 57 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Z: 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 58 70°C (158°F), and keep the engine speed at 2,000 rpm to 3,000 rpm for 2 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 HARNESS BETWEEN REAR OXY- Is the voltage more than 0.2 V? Replace the rear Repair the har- GEN SENSOR AND ECM CONNECTOR. oxygen sensor. ness and connec- 1)Turn the ignition switch to OFF. <Ref.
  • Page 60 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AA: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 61 70°C (158°F), and keep the engine speed at 2,000 rpm to 3,000 rpm for 2 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 62 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN REAR OXY- Is the voltage more than 0.2 V? Replace the rear Repair the har- GEN SENSOR AND ECM CONNECTOR. oxygen sensor. ness and connec- 1)Turn the ignition switch to OFF. <Ref.
  • Page 63 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AB: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(H4DOTC)(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? Inspect the rele- Replace the rear vant DTC using oxygen sensor. “List of Diagnostic <Ref. to Trouble Code FU(H4DOTC)-46, (DTC)”.
  • Page 65 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AD: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 60°C (140°F)? engine coolant 1)Start the engine and warm-up completely. temperature sen- 2)Read the data of engine coolant temperature sor. <Ref. to sensor signal using Subaru Select Monitor or FU(H4DOTC)-28, OBD-II general scan tool. Engine Coolant Temperature Sen- NOTE: sor.>...
  • Page 67 6)Measure the ambient temperature. parts. 7)Read the data of mass air flow and intake air temperature 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 68 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AE:DTC P0230 FUEL PUMP PRIMARY CIRCUIT • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec- tion Mode.>.
  • Page 69 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY CIRCUIT TO FUEL Is the voltage more than 10 V? Go to step 2. Repair the power PUMP CONTROL UNIT. supply circuit. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from fuel pump In this case repair...
  • Page 70 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN FUEL PUMP Is the resistance less than 1 Go to step 6. Repair the har- Ω? CONTROL UNIT AND ECM CONNECTOR. ness and connec- 1)Turn the ignition switch to OFF. tor.
  • Page 71 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AF:DTC P0244 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” RANGE/PERFORMANCE • 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 72 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- Replace the vant DTC using wastegate control “List of Diagnostic solenoid valve. Trouble Code <Ref. to (DTC)”.
  • Page 73 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AG:DTC P0245 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” LOW • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 74 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 75 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AH:DTC P0246 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” HIGH • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Erroneous idling CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 76 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Go to step 3. Go to step 2. 1)Turn the ignition switch to ON. 2)Measure the voltage between ECM and chassis ground.
  • Page 77 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AL: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 78 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: • LHD model MAIN RELAY BATTERY SBF-5 B137 B100 FUEL INJECTORS B137 1 2 3 4 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 10 11 12 13 14 15 16 17 19 20 21...
  • Page 79 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model MAIN RELAY BATTERY SBF-5 B137 FUEL INJECTORS B137 1 2 3 4 10 11 12 13 14 15 16 17 19 20 21 5 6 7 8 10 11 12 13 14 15 16 9 10 11 12 17 18...
  • Page 80 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Go to step 7. Go to step 3. 1)Turn the ignition switch to ON. 2)Measure the voltage between ECM connec- tor and chassis ground on faulty cylinders.
  • Page 81 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POWER SUPPLY LINE. Is the voltage more than 10 V? Repair the poor Repair the har- 1)Turn the ignition switch to ON. contact in all con- ness and connec- 2)Measure the voltage between fuel injector nectors in fuel tor.
  • Page 82 Is the malfunction indicator Go to step 15. Go to step 14. CATOR LIGHT. light coming on or blinking? 1)Clear the memory using Subaru Select Mon- itor. <Ref. to EN(H4DOTC)(diag)-47, Clear Mem- ory Mode.> 2)Start the engine, and drive the vehicle more than 10 minutes.
  • Page 83 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK CYLINDER. Is there a fault in that cylinder? Repair or replace Go to DTC P0171 the faulty parts. and P0172. <Ref. NOTE: EN(H4DOTC)(dia Check the follow- g)-143, DTC ing items.
  • Page 84 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AM: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 85 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 the har- SOR AND ECM CONNECTOR. 700 kΩ? ness and connec- 1)Turn the ignition switch to OFF. tor.
  • Page 86 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AN: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 87 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 88 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AO: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 89 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN CRANK- Is the resistance more than Repair the har- Go to step 2. SHAFT POSITION SENSOR AND ECM CON- 100 kΩ? ness and connec- NECTOR. tor. 1)Turn the ignition switch to OFF.
  • Page 90 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AP:DTC P0336 CRANKSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PER- FORMANCE • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine stalls. • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
  • Page 91 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 92 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AQ: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 93 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN CAMSHAFT Is the resistance more than Repair the har- Go to step 2. POSITION SENSOR AND ECM CONNEC- 100 kΩ? ness and connec- TOR. tor. 1)Turn the ignition switch to OFF. NOTE: 2)Disconnect the connector from camshaft In this case, repair...
  • Page 94 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AR:DTC P0341 CAMSHAFT POSITION SENSOR “A” CIRCUIT RANGE/PERFOR- MANCE (BANK 1 OR SINGLE SENSOR) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault • TROUBLE SYMPTOM: • Engine stalls. •...
  • Page 95 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 96 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK CAMSHAFT POSITION SENSOR. Is the resistance 1 — 4 kΩ? Go to step 7. Replace the cam- 1)Remove the camshaft position sensor. shaft position sen- 2)Measure the resistance between connector sor.
  • Page 97 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AS:DTC P0365 CAMSHAFT POSITION SENSOR “B” CIRCUIT (BANK 1) • 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 98 2)Measure the ignition timing advance using according to engine output tor. Subaru Select Monitor or OBD-II general scan change? NOTE: Idling: −2 — +2° tool, while running the vehicle at approx. 30 In this case, repair Vehicle running: −2 —...
  • Page 99 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AT:DTC P0390 CAMSHAFT POSITION SENSOR “B” CIRCUIT (BANK 2) • 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 100 2)Measure the ignition timing advance using according to engine output tor. Subaru Select Monitor or OBD-II general scan change? NOTE: Idling: −2 — +2° tool, while running the vehicle at approx. 30 In this case, repair Vehicle running: −2 —...
  • Page 101 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AU: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 102 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 103 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AV: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 104 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 105 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AW: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 106 ECM connector. NOTE: Purge control solenoid valve operation can be executed using the Subaru Select Monitor. For procedure, refer to “Compulsory Valve Opera- tion Check Mode”. <Ref. to EN(H4DOTC)(di- ag)-48, Compulsory Valve Operation Check Mode.>...
  • Page 107 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AX:DTC P0461 FUEL LEVEL SENSOR 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 108 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model No.13 SBF-4 SBF-1 IGNITION SWITCH COMBINATION METER FUEL GAUGE B135 AES : AUSTRALIA MODEL (EXCEPT FOR STi) : OTHER MODELS FUEL SUB FUEL LEVEL LEVEL SENSOR SENSOR B135 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10...
  • Page 109 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- Replace the fuel vant DTC using level sensor. <Ref. “List of Diagnostic to FU(H4DOTC)- Trouble Code 63, Fuel Level (DTC)”.
  • Page 110 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AY: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 111 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model No.13 SBF-4 SBF-1 IGNITION SWITCH COMBINATION METER FUEL GAUGE B135 AES : AUSTRALIA MODEL (EXCEPT FOR STi) : OTHER MODELS FUEL SUB FUEL LEVEL LEVEL SENSOR SENSOR B135 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10...
  • Page 112 SUBARU SELECT MONITOR) connector, while monitoring contact in ECM indicator light Read the data of fuel level sensor signal using value of Subaru Select Moni- connector. lights up, the cir- Subaru Select Monitor. tor. Does the voltage change? cuit has returned...
  • Page 113 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance less than 10 Repair or replace Repair the open Ω? COMBINATION METER. the combination circuit between Measure the resistance between ECM and meter.
  • Page 114 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) AZ: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 115 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model No.13 SBF-4 SBF-1 IGNITION SWITCH COMBINATION METER FUEL GAUGE B135 AES : AUSTRALIA MODEL (EXCEPT FOR STi) : OTHER MODELS FUEL SUB FUEL LEVEL LEVEL SENSOR SENSOR B135 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10...
  • Page 116 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK SPEEDOMETER AND TACHOME- Does the speedometer and Go to step 2. Repair or replace TER OPERATION IN COMBINATION tachometer operate normally? the combination METER. meter. <Ref. to IDI-3, Combina- tion Meter Sys- tem.>...
  • Page 117 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK FUEL TANK CORD. Is the resistance less than 10 Go to step 8. Repair the open Ω? 1)Disconnect the connector from fuel sub level circuit between sensor. fuel level sensor 2)Measure the resistance between fuel level and fuel sub level sensor and fuel sub level sensor.
  • Page 118 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BA: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 119 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: IGNITION SWITCH SBF-1 SBF-1 NO.18 NO.17 AIR CONDITIONING AIR CONDITIONING RELAY HOLDER RELAY HOLDER MAIN RELAY-1 RELAY-1 MAIN RELAY-2 RELAY-2 MAIN FAN MOTOR SUB FAN MOTOR B255 8 9 10 11 7 8 9 12 13 14 15 16 17 18 19 20 21 22 23 24 10 11 12...
  • Page 120 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, fan motor, fan “List of Diagnostic motor connector Trouble Code and thermostat.
  • Page 121 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BB:DTC P0502 VEHICLE SPEED SENSOR 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 122 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance more than 1 Go to step 3. Repair the ground TCM CONNECTOR. MΩ? short circuit in har- 1)Turn the ignition switch to OFF. ness between 2)Disconnect the connectors from ECM and ECM and TCM...
  • Page 123 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BC: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec- tion Mode.>.
  • Page 124 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK DTC P0720 ON DISPLAY. Does the Subaru Select Moni- Check the front Go to step 3. tor or OBD-II general scan tool vehicle speed sen- indicate DTC P0720? sor signal circuit.
  • Page 125 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BD: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 126 1)Turn the ignition switch to ON. 2)Start the engine, and warm-up the engine. 3)Turn all accessory switches to OFF. 4)Read the data of idle air control solenoid valve duty ratio using Subaru Select Monitor or OBD-II general scan tool. NOTE: •Subaru Select Monitor For detailed operation procedures, refer to the “READ CURRENT DATA FOR ENGINE”.
  • Page 127 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BE: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 128 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 129 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BF:DTC P0508 IDLE CONTROL SYSTEM CIRCUIT LOW • 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. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 130 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 3 V? Repair the poor Go to step 2. 1)Turn the ignition switch to ON. contact in ECM 2)Measure the voltage between ECM and connector.
  • Page 131 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BG:DTC P0509 IDLE CONTROL SYSTEM CIRCUIT HIGH • 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. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 132 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK THROTTLE CABLE. Does the throttle cable have Go to step 2. Adjust the throttle play for adjustment? cable. <Ref. to SP(H4SO)-9, INSTALLATION, Accelerator Con- trol Cable.> CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Go to step 3.
  • Page 133 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BH:DTC P0512 STARTER REQUEST CIRCUIT • DTC DETECTING CONDITION: • Immediately at fault recognition • TROUBLE SYMPTOM: • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 134 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OPERATION OF STARTER MOTOR. Does the starter motor operate Repair the battery Check the starter when ignition switch is turned short circuit in motor circuit. <Ref. to ON? starter motor cir- cuit.
  • Page 135 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BI: 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. •...
  • Page 136 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 137 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BJ:DTC P0545 EXHAUST GAS TEMPERATURE SENSOR CIRCUIT LOW-BANK • 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 138 Repair the poor 1)Start the engine. 1200°C (2192°F)? contact. 2)Read the data of exhaust gas 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 139 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BK:DTC P0546 EXHAUST GAS TEMPERATURE SENSOR CIRCUIT HIGH-BANK • 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 140 Repair the poor 1)Start the engine. 372°C (702°F)? contact. 2)Read the data of exhaust gas 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 141 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN EXHAUST Is the resistance less than 5 Replace the Repair the har- Ω? GAS TEMPERATURE SENSOR AND ECM exhaust gas tem- ness and connec- CONNECTOR. perature sensor. tor.
  • Page 142 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BM: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec- tion Mode.>.
  • Page 143 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 144 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BN:DTC P0565 CRUISE CONTROL ON SIGNAL • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 145 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 2. Repair the open Ω? CCM CONNECTOR. circuit in harness 1)Turn the ignition switch to OFF. between TCM and 2)Disconnect the connectors from TCM and CCM connector.
  • Page 146 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BO: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 147 8 9 10 11 12 13 14 15 EN-01293 Step Check CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni- Replace the ECM. A temporary poor tor or OBD-II general scan tool <Ref. to contact. indicate DTC P0604?
  • Page 148 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BP: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 149 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: IGNITION SWITCH SBF-1 SBF-1 NO.18 NO.17 AIR CONDITIONING AIR CONDITIONING RELAY HOLDER RELAY HOLDER MAIN RELAY-1 RELAY-1 MAIN RELAY-2 RELAY-2 MAIN FAN MOTOR SUB FAN MOTOR B255 8 9 10 11 7 8 9 12 13 14 15 16 17 18 19 20 21 22 23 24 10 11 12...
  • Page 150 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(H4DOTC)(diag)-32, Suba- ru Select Monitor.> Connector & terminal (B84) No.
  • Page 151 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK POOR CONTACT. Is there poor contact in ECM or Repair poor con- Contact your Sub- Check poor contact in ECM or fan relay con- fan relay connector? tact in ECM or fan aru distributor ser- nector.
  • Page 152 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BQ: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 153 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • WIRING DIAGRAM: IGNITION SWITCH SBF-1 SBF-1 NO.18 NO.17 AIR CONDITIONING AIR CONDITIONING RELAY HOLDER RELAY HOLDER MAIN RELAY-1 RELAY-1 MAIN RELAY-2 RELAY-2 MAIN FAN MOTOR SUB FAN MOTOR B255 8 9 10 11 7 8 9 12 13 14 15 16 17 18 19 20 21 22 23 24 10 11 12...
  • Page 154 NOTE: ECM connector. Radiator fan relay operation can be executed using the Subaru Select Monitor. For proce- dure, refer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4DOTC)(diag)-48, Compulsory Valve Operation Check Mode.> Connector & terminal (B84) No.
  • Page 155 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BR: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(H4DOTC)(diag)- 47, OPERATION.>...
  • Page 156 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 157 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BV: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 effective in “3” range; excessive shift shock; excessive tight corner “braking”...
  • Page 158 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BW: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 159 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 the ATF temperature sensor circuit. ture sensor circuit.
  • Page 160 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BX:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 161 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK DTC P0705 ON DISPLAY. Is DTC P0705 indicated? Inspect DTC Go to step 2. P0705 using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble Code (DTC).>...
  • Page 162 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BY:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 163 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 164 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 8. Repair open circuit Ω? NEUTRAL POSITION SWITCH CONNEC- in harness TOR. between ECM and 1)Disconnect the connector from ECM.
  • Page 165 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) BZ: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 166 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK DTC P0705 ON DISPLAY. Is DTC P0705 indicated? Inspect DTC Go to step 2. P0705 using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble Code (DTC).>...
  • Page 167 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 168 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CA: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 169 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 170 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK NEUTRAL POSITION SWITCH. Is the resistance less than 1 Go to step 8. Replace the neu- Ω? 1)Set the shift lever to except neutral position. tral position switch. 2)Measure the resistance between transmis- sion harness connector receptacle’s terminals.
  • Page 171 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CB: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 172 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ACCESSORY. Are car phone and/or CB Repair the ground- Replace the TCM. installed on vehicle? ing line of car <Ref. to 4AT-74, phone or CB sys- Transmission Con- tem.
  • Page 173 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CC: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 174 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 175 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CD: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 176 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage more than 10 V? Repair the battery Go to step 2. TCM CONNECTOR. short circuit in har- 1)Turn the ignition switch to ON. ness between 2)Measure the voltage between ECM and ECM and TCM...
  • Page 177 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CE:DTC P1086 TUMBLE GENERATED VALVE POSITION SENSOR 2 CIRCUIT • 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 178 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model TUMBLE GENERATOR VALVE POSITION SENSOR LH 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 179 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 180 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 the har- TUMBLE GENERATOR VALVE POSITION ness and connec- SENSOR CONNECTOR. tor. 1)Turn the ignition switch to OFF.
  • Page 181 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CF:DTC P1087 TUMBLE GENERATED VALVE POSITION SENSOR 2 CIRCUIT HIGH • 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 182 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model TUMBLE GENERATOR VALVE POSITION SENSOR LH 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 183 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 184 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CG:DTC P1088 TUMBLE GENERATED VALVE POSITION SENSOR 1 CIRCUIT • 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 185 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model TUMBLE GENERATOR VALVE POSITION SENSOR RH 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 186 1)Start the engine. indicator light 2)Read the data of tumble generator valve lights up, the cir- position sensor signal using Subaru Select cuit has returned Monitor or OBD-II general scan tool. to a normal condi- tion at this time. A...
  • Page 187 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 the har- TUMBLE GENERATOR VALVE POSITION ness and connec- SENSOR CONNECTOR. tor. 1)Turn the ignition switch to OFF.
  • Page 188 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CH:DTC P1089 TUMBLE GENERATED VALVE POSITION SENSOR 1 CIRCUIT HIGH • 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 189 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model TUMBLE GENERATOR VALVE POSITION SENSOR RH 1 2 3 9 10 11 12 14 15 17 18 19 20 1 2 3 4 5 6 B135 11 12 13 14 15 16 17 18 19 20 21 26 27 28...
  • Page 190 1)Start the engine. indicator light 2)Read the data of tumble generator valve lights up, the cir- position sensor signal using Subaru Select cuit has returned Monitor or OBD-II general scan tool. to a normal condi- tion at this time. A...
  • Page 191 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CI: DTC P1090 TUMBLE GENERATED VALVE SYSTEM 1 (VALVE OPEN) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 192 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CK:DTC P1092 TUMBLE GENERATED VALVE SYSTEM 2 (VALVE OPEN) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 193 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CM:DTC P1094 TUMBLE GENERATED VALVE SIGNAL 1 CIRCUIT MALFUNC- TION (OPEN) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 194 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? TUMBLE GENERATOR VALVE ACTUATOR circuit between CONNECTOR. ECM and tumble 1)Turn the ignition switch to OFF.
  • Page 195 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CN:DTC P1095 TUMBLE GENERATED VALVE SIGNAL 1 CIRCUIT MALFUNC- TION (SHORT) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 196 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage less than 5 V? Replace the tum- Repair the battery TUMBLE GENERATOR VALVE ACTUATOR ble generator valve short circuit CONNECTOR. assembly. <Ref. to between ECM and 1)Turn the ignition switch to OFF.
  • Page 197 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CO:DTC P1096 TUMBLE GENERATED VALVE SIGNAL 2 CIRCUIT MALFUNC- TION (OPEN) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 198 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? TUMBLE GENERATOR VALVE ACTUATOR circuit between CONNECTOR. ECM and tumble 1)Turn the ignition switch to OFF.
  • Page 199 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CP:DTC P1097 TUMBLE GENERATED VALVE SIGNAL 2 CIRCUIT MALFUNC- TION (SHORT) • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 200 47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec- tion Mode.>. Step Check CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni- Replace the ECM. A temporary poor tor or OBD-II general scan tool <Ref. to contact.
  • Page 201 12 13 14 15 16 17 18 19 20 21 22 23 24 : LHD : RHD EN-01299 Step Check CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni- Replace the ECM. A temporary poor tor or OBD-II general scan tool <Ref. to contact. indicate DTC P1134?
  • Page 202 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CT:DTC P1152 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (BANK1 SENSOR1) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 203 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 har- Ω? FRONT OXYGEN (A/F) SENSOR CONNEC- ness and connec- TOR. tor. 1)Turn the ignition switch to OFF.
  • Page 204 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CU:DTC P1153 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH) (BANK1 SENSOR1) • DTC DETECTING CONDITION: • Two consecutive driving cycles with fault CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 205 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance more than 1 Go to step 2. Repair the ground FRONT OXYGEN (A/F) SENSOR CONNEC- MΩ? short circuit in har- TOR. ness between 1)Turn the ignition switch to OFF.
  • Page 206 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CV:DTC P1301 MISFIRE DETECTED (HIGH TEMPERATURE EXHAUST GAS) • 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 207 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK ANY OTHER DTC. Does failure for repair or Repair or replace Contact your Sub- Conduct the troubleshooting for all DTC replacement exist? the failure, then aru distributor ser- P0301, P0302, P0303 and P0304.
  • Page 208 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CW:DTC P1306 OCV SOLENOID VALVE SIGNAL 1 CIRCUIT MALFUNCTION (OPEN) • 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 209 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair the open Ω? FLOW CONTROL SOLENOID VALVE. circuit in harness 1)Turn the ignition switch to OFF. between ECM and 2)Disconnect the connector from ECM and oil oil flow control...
  • Page 210 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CX:DTC P1307 OCV SOLENOID VALVE SIGNAL 1 CIRCUIT MALFUNCTION (SHORT) • 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 211 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair the open Ω? FLOW CONTROL SOLENOID VALVE. circuit in harness 1)Turn the ignition switch to OFF. between ECM and 2)Disconnect the connector from ECM and oil oil flow control...
  • Page 212 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CY:DTC P1308 OCV SOLENOID VALVE SIGNAL 2 CIRCUIT MALFUNCTION (OPEN) • 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 213 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair the open Ω? FLOW CONTROL SOLENOID VALVE. circuit in harness 1)Turn the ignition switch to OFF. between ECM and 2)Disconnect the connector from ECM and oil oil flow control...
  • Page 214 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) CZ:DTC P1309 OCV SOLENOID VALVE SIGNAL 2 CIRCUIT MALFUNCTION (SHORT) • 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 215 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair the open Ω? FLOW CONTROL SOLENOID VALVE. circuit in harness 1)Turn the ignition switch to OFF. between ECM and 2)Disconnect the connector from ECM and oil oil flow control...
  • Page 216 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) DA:DTC P1312 EXHAUST GAS TEMPERATURE SENSOR MALFUNCTION • DTC DETECTING CONDITION: • Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 217 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- Replace the vant DTC using exhaust gas tem- “List of Diagnostic perature sensor. Trouble Code <Ref.
  • Page 218 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) DB: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 219 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK OPERATION OF STARTER MOTOR. Does the starter motor operate Repair the har- Check the starter when ignition switch is turned ness and connec- motor circuit. <Ref. to START? tor.
  • Page 220 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) DC:DTC P1544 EXHAUST GAS TEMPERATURE TOO HIGH • 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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 221 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- Go to step 2. vant DTC using “List of Diagnostic Trouble Code (DTC)”. <Ref. to EN(H4DOTC)(dia g)-74, List of Diag- nostic Trouble...
  • Page 222 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) DD: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec- tion Mode.>.
  • Page 223 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) • RHD model MAIN RELAY DATA LINK CONNECTOR SBF-5 IGNITION BATTERY SWITCH No.11 SBF-4 SBF-1 B134 B136 B137 B134 B137 1 2 3 4 1 2 3 4 5 6 7 8 10 11 12 14 15 10 11 12...
  • Page 224 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) Step Check CHECK FUSE SBF-5. Is the fuse blown? Replace the fuse. Repair the har- ness and connec- tor. NOTE: In this case, repair the following: • Open circuit in harness between ECM and battery •...
  • Page 225 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) DE: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 226 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 227 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTICS) DF: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(H4DOTC)(diag)- 47, OPERATION, Clear Memory Mode.>...
  • Page 228 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 229: 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(H4DOTC)-109, Engine Trouble in General.> Symptom Problem parts 1) Idle air control solenoid valve 2) Manifold absolute pressure sensor 3) Mass air flow and intake temperature sensor 4) Ignition parts (*1) 1.
  • Page 230 General Diagnostic Table ENGINE (DIAGNOSTICS) Symptom Problem parts 1) Manifold absolute pressure sensor 2) Mass air flow and intake temperature sensor 3) Engine coolant temperature sensor (*2) 4) Crankshaft position sensor (*3) 6. Surge 5) Camshaft position sensor (*3) 6) Fuel injection parts (*4) 7) Throttle position sensor 8) Fuel pump and fuel pump relay 1) Manifold absolute pressure sensor...
  • Page 231 General Diagnostic Table ENGINE (DIAGNOSTICS) EN(H4DOTC)(diag)-310...

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