Subaru 2004 FORESTER Service Manual
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Subaru 2004 FORESTER Service Manual

Engine section 2
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See also: Service Manual , Owner's Manual
2004 FORESTER 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 SYSTEM)
EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICE)
INTAKE (INDUCTION)
MECHANICAL
EXHAUST
COOLING
LUBRICATION
SPEED CONTROL SYSTEM
IGNITION
STARTING/CHARGING SYSTEM
ENGINE (DIAGNOSTIC)
FU(H4DOTC)
EC(H4DOTC)
IN(H4DOTC)
ME(H4DOTC)
EX(H4DOTC)
CO(H4DOTC)
LU(H4DOTC)
SP(H4DOTC)
IG(H4DOTC)
SC(H4DOTC)
EN(H4DOTC)
G8080GE3

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Summary of Contents for Subaru 2004 FORESTER

  • Page 1: Engine Section

    2004 FORESTER SERVICE MANUAL QUICK REFERENCE INDEX ENGINE SECTION 2 FUEL INJECTION (FUEL SYSTEM) FU(H4DOTC) EMISSION CONTROL EC(H4DOTC) (AUX. EMISSION CONTROL DEVICE) INTAKE (INDUCTION) IN(H4DOTC) MECHANICAL ME(H4DOTC) This service manual has been prepared to provide SUBARU service personnel EXHAUST EX(H4DOTC)

  • Page 3: Table Of Contents

    Engine Control Module (ECM) I/O Signal ..........23 Engine Condition Data ................27 Transmission Control Module (TCM) I/O Signal ........28 Data Link Connector .................29 OBD-II General Scan Tool ................30 Subaru Select Monitor................33 Read Diagnostic Trouble Code (DTC) ............39 Inspection Mode..................40 Drive Cycle....................45 Clear Memory Mode..................47 Compulsory Valve Operation Check Mode ..........48...

  • Page 4: Obd-Ii General Scan Tool

    10%? to clean oil routing. sary. using Subaru Select Monitor or OBD-II general Replace the • Oil pipe (clog- scan tool. engine oil, and ging) then idle the •...
  • Page 5 10%? to clean oil routing. sary. using Subaru Select Monitor or OBD-II general Replace the • Engine oil scan tool. engine oil, and (amount, dirt) then idle the •...
  • Page 6 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) C: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 7 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 the engine.
  • Page 8 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) D: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1) DTC DETECTING CONDITION: Detect as soon as the malfunction occurs. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 9 Go to step 4. 1) Start the engine. tact 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: •...
  • Page 10 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage less than 1 V? Go to step 8. Go to step 7. Measure the voltage between ECM connector and chassis ground. Connector &...
  • Page 11 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) E: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1) DTC DETECTING CONDITION: Detect as soon as the malfunction occurs. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 12 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 OBD-II general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedure, refer to “READ CURRENT DATA SHOWN ON DIS-...

  • Page 13: Wiring Diagram

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) F: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2) DTC DETECTING CONDITION: Detect as soon as the malfunction occurs. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 14 Go to step 3. 1) Start the engine. nector. 2) Read the data of rear 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: •...
  • Page 15 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 16 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 17 Engine Control 2) Turn the ignition switch to ON. Module (ECM).> 3) Read the data of rear oxygen (A/F) sensor heater current using Subaru Select Monitor or OBD-II general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedure, refer to “READ CURRENT DATA SHOWN ON DIS-...
  • Page 18 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) H: DTC P0068 MANIFOLD PRESSURE SENSOR 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 19 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model THROTTLE BODY MANIFOLD ABSOLUTE PRESSURE SENSOR B122 B136 B122 B136 1 2 3 1 2 3 4 5 6 7 8 11 12 13 14 15 9 10 11 12 17 18 19 20 21 22 23...
  • Page 20 • Subaru Select Monitor PEDAL POSI- For detailed operation procedure, refer to the TION SENSOR/ “LED OPERATION MODE FOR ENGINE”. SWITCH “A” CIR- <Ref. to EN(H4DOTC)-33, Subaru Select Mon- CUIT RANGE/ itor.> PERFORMANCE, Diagnostic Proce- dure with Diagnos- tic Trouble Code (DTC).>...
  • Page 21 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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. • Poor driving performance CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
  • Page 22 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 23 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) J: DTC P0102MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT DTC DETECTING CONDITION: Immediately at fault recognition TROUBLE SYMPTOM: • Erroneous idling • Engine stalls. • Poor driving performance WIRING DIAGRAM: MAIN RELAY BATTERY SBF-5...

  • Page 24: Subaru Select Monitor

    READ DATA. light illuminates, 1) Turn the ignition switch to OFF. the circuit has 2) Connect the Subaru Select Monitor or the returned to a nor- OBD-II general scan tool to data link connec- mal condition at tor.
  • Page 25 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance less than 1 Go to step 6. Repair open circuit Ω? MASS AIR FLOW SENSOR CONNECTOR. between ECM and 1) Turn the ignition switch to OFF. mass air flow sen- 2) Disconnect the connector from ECM.
  • Page 26 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 27 READ DATA. light illuminates, 1) Turn the ignition switch to OFF. the circuit has 2) Connect the Subaru Select Monitor or the returned to a nor- OBD-II general scan tool to data link connec- mal condition at tor.
  • Page 28 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 29 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model THROTTLE BODY MANIFOLD ABSOLUTE PRESSURE SENSOR B122 B136 B122 B136 1 2 3 1 2 3 4 5 6 7 8 11 12 13 14 15 9 10 11 12 17 18 19 20 21 22 23...
  • Page 30 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM ECM. Is the voltage more than 4.5 V? Go to step 3. Go to step 2. Measure the voltage between ECM connector and chassis ground. Connector &...
  • Page 31 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) M: DTC P0108 INTAKE AIR PRESSURE SENSOR 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 32 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model THROTTLE BODY MANIFOLD ABSOLUTE PRESSURE SENSOR B122 B136 B122 B136 1 2 3 1 2 3 4 5 6 7 8 11 12 13 14 15 9 10 11 12 17 18 19 20 21 22 23...
  • Page 33 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM ECM. Is the voltage more than 4.5 V? Go to step 3. Go to step 2. Measure the voltage between ECM connector and chassis ground. Connector &...
  • Page 34 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) N: 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(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 35 P0125 using “List 2) Measure the engine coolant temperature 95°C (203°F)? air temperature of Diagnostic Trou- using Subaru Select Monitor or OBD-II general sensor. <Ref. to ble Code (DTC)”. scan tool. FU(H4DOTC)-35, <Ref. to Mass Air Flow and...
  • Page 36 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) O: 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 37 1) Start the engine. more than 55°C (131°F)? contact. 2) Read the data of intake air temperature NOTE: sensor signal using Subaru Select Monitor or In this case repair the OBD-II general scan tool. the following: • Poor contact in NOTE: •...
  • Page 38 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) P: 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 39 Repair the poor 1) Start the engine. (−33°F)? contact. 2) Read the data of intake air temperature NOTE: sensor signal using Subaru Select Monitor or In this case repair the OBD-II general scan tool. the following: • Poor contact in NOTE: •...
  • Page 40 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 41 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Q: 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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 42 1) Start the engine. more than 120°C (248°F)? contact. 2) Read the data of engine coolant tempera- NOTE: ture sensor signal using Subaru Select Monitor In this case repair or the OBD-II general scan tool. the following: • Poor contact in NOTE: •...
  • Page 43 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) R: 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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 44 Repair the poor 1) Start the engine. (−40°F)? contact. 2) Read the data of engine coolant tempera- NOTE: ture sensor signal using Subaru Select Monitor In this case repair or the OBD-II general scan tool. the following: • Poor contact in NOTE: •...
  • Page 45 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 46 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) S: 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 • Fuel is cut. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
  • Page 47 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model THROTTLE POSITION SENSOR 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 B122 5 6 7 8 B136 11 12 13 14 15 17 18 19 20 21 22 23 26 27...
  • Page 48 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) T: 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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 49 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model THROTTLE POSITION SENSOR 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 B122 5 6 7 8 B136 11 12 13 14 15 17 18 19 20 21 22 23 26 27...
  • Page 50 Even if the mal- 1) Start the engine. function indicator 2) Read the data of throttle position sensor light illuminates, signal using Subaru Select Monitor or OBD-II the circuit has general scan tool. returned to a nor- mal condition at NOTE: this time.A tempo-...
  • Page 51 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 In this case repair...
  • Page 52 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) U: 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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 53 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model THROTTLE POSITION SENSOR 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 B122 5 6 7 8 B136 11 12 13 14 15 17 18 19 20 21 22 23 26 27...
  • Page 54 Even if the mal- 1) Start the engine. function indicator 2) Read the data of throttle position sensor light illuminates, signal using Subaru Select Monitor or OBD-II the circuit has general scan tool. returned to a nor- mal condition at NOTE: this time.A tempo-...
  • Page 55 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) V: 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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 56 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 57 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) X: DTC P0131 O SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR1) DTC DETECTING CONDITION: Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 58 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND Is the resistance more than 1 Replace the front Repair the ground FRONT OXYGEN (A/F) SENSOR CONNEC- MΩ? oxygen (A/F) sen- short circuit in har- TOR.
  • Page 59 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Y: DTC P0132 O SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1) DTC DETECTING CONDITION: Detect as soon as the malfunction occurs. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 60 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND Is the voltage more than 8 V? Replace the front Repair the battery FRONT OXYGEN (A/F) SENSOR CONNEC- oxygen (A/F) sen- short circuit in har- TOR.
  • Page 61 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Z: DTC P0133 O 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 62 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 63 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AA:DTC P0134 O 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(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 64 Go to step 3. Go to step 4. 1.15 (in idling)? 1) Start the engine. 2) While observing the Subaru Select Monitor or OBD-II general scan tool screen, warm-up the engine until coolant temperature is above 70°C (158°F). If the engine is already warmed-up, operate at idle speed for at least 1 minute.
  • Page 65 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AB:DTC P0137 O 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 66 70°C (158°F), and keep the engine speed at 2,000 rpm to 3,000 rpm for two minutes. 2) Read the data of rear 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 “READ CURRENT DATA SHOWN ON DIS-...
  • Page 67 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK EXHAUST SYSTEM. Is there a fault in exhaust sys- Repair or replace Replace the rear Check exhaust system parts. tem? the faulty part. oxygen sensor. <Ref. to NOTE: FU(H4DOTC)-47, Check the following items: Rear Oxygen Sen-...
  • Page 68 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AC:DTC P0138 O 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 69 70°C (158°F), and keep the engine speed at 2,000 rpm to 3,000 rpm for two minutes. 2) Read the data of rear 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 “READ CURRENT DATA SHOWN ON DIS-...
  • Page 70 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK EXHAUST SYSTEM. Is there a fault in exhaust sys- Repair or replace Replace the rear Check exhaust system parts. tem? the faulty part. oxygen sensor. <Ref. to NOTE: FU(H4DOTC)-47, Check the following items: Rear Oxygen Sen-...
  • Page 71 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AD:DTC P0139 O 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 72 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-47, (DTC)”.
  • Page 73 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AF: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 74 1) Start the engine and warm-up completely. temperature sen- 2) Read the data of engine coolant tempera- sor. <Ref. to ture sensor signal using Subaru Select Monitor FU(H4DOTC)-29, or the OBD-II general scan tool. Engine Coolant Temperature Sen- NOTE: sor.>...
  • Page 75 5) Open the hood. parts. 6) Measure the ambient temperature. 7) Read the data of mass air flow and intake air temperature sensor signal using Subaru Select Monitor or the OBD-II general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedure, refer to “READ CURRENT DATA SHOWN ON DIS-...
  • Page 76 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AG: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)-47, OP- ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>. WIRING DIAGRAM: •...
  • Page 77 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model FUEL PUMP RELAY BATTERY SBF-5 FUEL PUMP CONTROL MODULE R122 FUEL PUMP B135 B137 R122 1 2 3 4 1 2 3 4 5 6 7 8 5 6 7 8 9 10 10 11 12 13 14 15 19 20 26 27 28 29...
  • Page 78 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 79 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 80 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AH: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 81 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 82 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AI: 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 83 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Even if the mal- Go to step 2. 1) Turn the ignition switch to ON. function indicator 2) Measure the voltage between ECM and light illuminates, chassis ground.
  • Page 84 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AJ: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 85 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 86 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AK:DTC P0301 CYLINDER 1 MISFIRE DETECTED NOTE: For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4DOTC)-163, DTC P0304 CYLINDER 4 MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).> AL:DTC P0302 CYLINDER 2 MISFIRE DETECTED NOTE: For the diagnostic procedure, refer to DTC P0304.
  • Page 87 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AN: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: • Engine stalls. •...
  • Page 88 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) WIRING DIAGRAM: • LHD model MAIN RELAY BATTERY SBF-5 B136 B100 B200 FUEL INJECTORS B136 1 2 3 4 1 2 3 4 8 9 10 11 11 12 13 14 15 5 6 7 8 5 6 7 8 12 13 14 15 16 17 18 19 20 21 22 23 24...
  • Page 89 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model MAIN RELAY BATTERY SBF-5 B136 FUEL INJECTORS B136 1 2 3 4 10 11 12 13 14 15 16 5 6 7 8 17 18 19 20 21 22 23 24 9 10 11 12 13 14 15 16...
  • Page 90 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 91 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK POWER SUPPLY LINE. Is the voltage more than 10 V? Repair poor con- Repair the har- 1) Turn the ignition switch to ON. tact in all connec- ness and connec- 2) Measure the voltage between fuel injector tors in fuel injector tor.
  • Page 92 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 Monitor. <Ref. to EN(H4DOTC)-47, Clear Memory Mode.> 2) Start the engine, and drive the vehicle more than 10 minutes.
  • Page 93 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AO: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 94 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 95 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AP: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 96 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 97 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AQ: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 98 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 99 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AR: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 100 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 101 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AS: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 102 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN CAMSHAFT Is the resistance more than Repair the har- Go to step 2. POSITION SENSOR CONNECTOR AND ECM 100 kΩ? ness and connec- CONNECTOR. tor. 1) Turn the ignition switch to OFF. NOTE: 2) Disconnect the connector from camshaft In this case repair...
  • Page 103 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AT: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. • Failure of engine to start CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
  • Page 104 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 105 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK CONDITION OF CAMSHAFT POSI- Is the camshaft position sensor Go to step 6. Tighten the cam- TION SENSOR CONNECTOR. connector installation bolt tight- shaft position sen- ened securely? sor connector installation bolt securely.
  • Page 106 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AU: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 107 NOTE: km/h (19 MPH), and then measure the ignition output? In this case, repair Idling: −2 — +2° timing advance angle using Subaru Select the following: Driving: −2 — +50° Monitor or OBD-II general scan tool. • Poor contact of...
  • Page 108 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AV: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 109 NOTE: km/h (19 MPH), and then measure the ignition output? In this case, repair Idling: −2 — +2° timing advance angle using Subaru Select the following: Driving: −2 — +50° Monitor or OBD-II general scan tool. • Poor contact of...
  • Page 110 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AW: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 111 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 112 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AX: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 113 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Even if the mal- Go to step 2. 1) Turn the ignition switch to ON. function indicator 2) Measure the voltage between ECM and light illuminates, chassis ground.
  • Page 114 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AY: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)-47, OP- ERATION, Clear Memory Mode.>...

  • Page 115: Compulsory Valve Operation Check Mode

    ECM connector. NOTE: Purge control solenoid valve operation can be executed using Subaru Select Monitor.For the procedure, refer to “Compulsory Valve Opera- tion Check Mode”. <Ref. to EN(H4DOTC)-48, Compulsory Valve Operation Check Mode.> Connector & terminal −...
  • Page 116 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) AZ: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 117 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect the rele- Replace the fuel vant DTC using level sensor and “List of Diagnostic fuel sub level sen- Trouble Code sor.
  • Page 118 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BA: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 119 Read the data of fuel level sensor signal using nector of ECM while monitor- connector. light illuminates, Subaru Select Monitor. ing the value with Subaru the circuit has Select Monitor? returned to a nor- NOTE: mal condition at •...
  • Page 120 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK FUEL TANK CORD. Is the resistance more than 1 Go to step 8. Repair ground 1) Turn the ignition switch to OFF. MΩ? short circuit in fuel 2) Disconnect the connector from fuel sub tank cord.
  • Page 121 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BB: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 122 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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, Combination Meter System.>...
  • Page 123 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK FUEL TANK CORD. Is the resistance less than 10 Go to step 8. Repair open circuit Ω? 1) Disconnect the connector from fuel sub between fuel level level sensor. sensor and fuel 2) Measure the resistance between fuel level sub level sensor.
  • Page 124 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BC:DTC P0464 FUEL LEVEL SENSOR CIRCUIT INTERMITTENT 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 125 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 126 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BD:DTC P0483 COOLING FAN RATIONALITY CHECK DTC DETECTING CONDITION: Two consecutive driving cycles with fault TROUBLE SYMPTOM: • Occurrence of noise • Over-heating CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 127 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH SBF-4 No.18 LHD : 10 RHD : 7 No.17 LHD : 11 RHD : 19 B100 MAIN B135 ECM MODE RELAY RELAY RELAY MAIN FAN SUB FAN A/C RELAY HOLDER MOTOR...
  • Page 128 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 and “List of Diagnostic thermostat and Trouble Code replace the ther- (DTC)”.
  • Page 129 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BE: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 130 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK TRANSMISSION TYPE. Is the transmission type AT? Go to step 2. Go to step 4. CHECK HARNESS BETWEEN ECM AND Is the resistance more than 1 Go to step 3. Repair ground TCM CONNECTOR.
  • Page 131 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BF:DTC P0503 VEHICLE SPEED SENSOR 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 132 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK TRANSMISSION TYPE. Is the transmission type AT? Go to step 2. Go to step 3. CHECK SPEEDOMETER OPERATION IN Does speedometer operate Go to step 3. Check the speed- COMBINATION METER.
  • Page 133 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BG: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 134 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 duty ratio using Subaru Select Monitor or OBD-II general scan tool. NOTE: • Subaru Select Monitor For detailed operation procedure, refer to “READ CURRENT DATA SHOWN ON DIS-...
  • Page 135 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BH: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 136 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 137 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BI: 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 138 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 139 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BJ: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 140 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK THROTTLE CABLE. Does the throttle cable have Go to step 2. Adjust throttle play for adjustment? cable. <Ref. to SP(H4SO)-9, Accelerator Con- trol Cable.> CHECK OUTPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Go to step 3.
  • Page 141 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BK: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 142 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK OPERATION OF STARTER MOTOR. Does the starter motor operate Repair battery Check starter when ignition switch to ON? short circuit in motor circuit. <Ref. starter motor cir- to EN(H4DOTC)- cuit.After repair, 60, STARTER replace the ECM.
  • Page 143 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BL: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. • Fuel is cut according to fail-safe function. CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref.
  • Page 144 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 145 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BM:DTC P0545 EXHAUST GAS TEMPERATURE SENSOR CIRCUIT LOW - BANK 1 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 146 1) Start the engine. more than 1200°C (2192°F)? contact. 2) Read the data of exhaust temperature sen- NOTE: sor signal using Subaru Select Monitor or In this case repair OBD-II general scan tool. the following: • Poor contact of NOTE: •...
  • Page 147 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BN:DTC P0546 EXHAUST GAS TEMPERATURE SENSOR HIGH - BANK 1 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 148 Repair the poor 1) Start the engine. 372°C (702°F)? contact. 2) Read the data of exhaust temperature sen- NOTE: sor signal using Subaru Select Monitor or In this case repair OBD-II general scan tool. the following: • Poor contact of NOTE: •...
  • Page 149 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN EXHAUST Is the resistance less than 5 Replace the Repair the har- Ω? TEMPERATURE SENSOR AND ECM CON- exhaust tempera- ness and connec- NECTOR. ture sensor. <Ref. tor.
  • Page 150 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BP: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)-47, OP- ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>. WIRING DIAGRAM: B134 B134...
  • Page 151 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN GENERATOR Is the resistance more than 1 Go to step 2. Repair ground AND ECM CONNECTOR. MΩ? short circuit in har- 1) Turn the ignition switch to OFF. ness between 2) Disconnect the connector from generator ECM and purge...
  • Page 152 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BQ:DTC P0600 SERIAL COMMUNICATION LINK DTC DETECTING CONDITION: Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>. WIRING DIAGRAM: B137 B137...
  • Page 153 (B137) No. 18 — (B137) No. 26: CHECK AT SYSTEM STATUS. Does the Subaru Select Moni- Inspect the AT sys- Replace the ECM. Check the AT using Subaru Select Monitor. tor display DTC P1718? tem. <Ref. to FU(H4DOTC)-50, Engine Control Module (ECM).>...
  • Page 154 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BR:DTC P0604 INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM) 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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 155 13 14 15 16 30 31 33 34 EN-02313 Step Check CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni- Replace the ECM. Temporary poor tor or OBD-II general scan tool <Ref. to contact occurs. indicate DTC P0604?
  • Page 156 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BS: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. • Over-heating CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 157 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH SBF-4 No.18 LHD : 10 RHD : 7 No.17 LHD : 11 RHD : 19 B100 MAIN B135 ECM MODE RELAY RELAY RELAY MAIN FAN SUB FAN A/C RELAY HOLDER MOTOR...
  • Page 158 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, re- fer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4DOTC)-48, Compulsory Valve Operation Check Mode.> Connector & terminal −...
  • Page 159 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK POOR CONTACT. Is there poor contact in ECM or Repair the poor Contact the SUB- Check poor contact in ECM or fan relay con- fan relay connector? contact in ECM or ARU dealer.
  • Page 160 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BT: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. • Over-heating CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 161 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) WIRING DIAGRAM: BATTERY SBF-1 IGNITION SWITCH SBF-4 No.18 LHD : 10 RHD : 7 No.17 LHD : 11 RHD : 19 B100 MAIN B135 ECM MODE RELAY RELAY RELAY MAIN FAN SUB FAN A/C RELAY HOLDER MOTOR...
  • Page 162 NOTE: contact in ECM Radiator fan relay operation can be executed connector. using Subaru Select Monitor.For procedure, re- fer to “Compulsory Valve Operation Check Mode”. <Ref. to EN(H4DOTC)-48, Compulsory Valve Operation Check Mode.> Connector & terminal −...
  • Page 163 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BV: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 164 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM ECM. Is the voltage 4.5 — 5.5 V? Even if the mal- Go to step 2. 1) Turn the ignition switch to ON. function indicator 2) Shift the select lever to other than “N”...
  • Page 165 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BW: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 166 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM 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 167 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BX: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 168 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM ECM. Is the voltage less than 1 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 with select lever at “N”...
  • Page 169 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INHIBITOR SWITCH GROUND LINE. Is the resistance less than 5 Go to step 7. Repair open circuit Ω? Measure the resistance of harness between in harness inhibitor switch connector and engine ground. between inhibitor Connector &...
  • Page 170 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BY: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 171 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM ECM. Is the voltage less than 1 V? Go to step 2. Go to step 4. 1) Turn the ignition switch to ON. 2) Place the shift lever except in neutral posi- tion.
  • Page 172 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) BZ: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 173 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model TUMBLE GENERATOR VALVE POSITION SENSOR LH 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 5 6 7 8 B122 B136 11 12 13 14 15...
  • Page 174 Even if the mal- 1) Start the engine. function indicator 2) Read the data of throttle position sensor light illuminates, signal using Subaru Select Monitor or OBD-II the circuit has general scan tool. returned to a nor- mal condition at NOTE: this time.A tempo-...
  • Page 175 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 176 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CA: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 177 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model TUMBLE GENERATOR VALVE POSITION SENSOR LH 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 5 6 7 8 B122 B136 11 12 13 14 15...
  • Page 178 Even if the mal- 1) Start the engine. function indicator 2) Read the data of throttle position sensor light illuminates, signal using Subaru Select Monitor or OBD-II the circuit has general scan tool. returned to a nor- mal condition at NOTE: this time.A tempo-...
  • Page 179 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CB: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 180 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model TUMBLE GENERATOR POSITION SENSOR RH 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 5 6 7 8 B136 B122 11 12 13 14 15 17 18 19 20 21...
  • Page 181 Even if the mal- 1) Start the engine. function indicator 2) Read the data of tumble generator valve light illuminates, position sensor signal using Subaru Select the circuit has Monitor or OBD-II general scan tool. returned to a nor- mal condition at NOTE: this time.A tempo-...
  • Page 182 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 183 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CC: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 184 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model TUMBLE GENERATOR POSITION SENSOR RH 1 2 3 9 10 11 12 14 15 17 18 19 20 B122 1 2 3 4 5 6 7 8 B136 B122 11 12 13 14 15 17 18 19 20 21...
  • Page 185 Even if the mal- 1) Start the engine. function indicator 2) Read the data of tumble generator valve light illuminates, position sensor signal using Subaru Select the circuit has Monitor or OBD-II general scan tool. returned to a nor- mal condition at NOTE: this time.A tempo-...
  • Page 186 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CD: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 187 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CF: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 188 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CH: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 189 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 190 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CI: 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 191 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 192 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CJ: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 193 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 194 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CK: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 195 After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>. Step Check CHECK ANY OTHER DTC ON DISPLAY. Does the Subaru Select Moni- Replace the ECM. Temporary poor tor or OBD-II general scan tool <Ref. to contact occurs.
  • Page 196 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CN:DTC P1152 O SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 197 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 198 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CO:DTC P1153 O SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH) (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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 199 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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 200 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CP: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. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 201 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK DTC. Does failure for repair or Repair or replace Contact the SUB- Conduct the troubleshooting for all DTC replacement exist? failure, then ARU dealer. P0301, P0302, P0303 and P0304. <Ref. to replace the precat- NOTE: EN(H4DOTC)-74, List of Diagnostic Trouble...
  • Page 202 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CQ:DTC P1312 INTAKE AIR TEMPERATURE CIRCUIT RANGE/PERFORMANCE DTC DETECTING CONDITION: Immediately at fault recognition CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP- ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>. WIRING DIAGRAM: EXHAUST TEMPERATURE...

  • Page 203: List Of Diagnostic Trouble Code (Dtc)

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Inspect the rele- Replace the vant DTC using exhaust tempera- “List of Diagnostic ture sensor. <Ref. Trouble Code to FU(H4DOTC)- (DTC)”.

  • Page 204: Diagnostic Procedure With Diagnostic Trouble Code (Dtc)

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CR: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 205 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK OPERATION OF STARTER MOTOR. Does the starter motor operate Repair the har- Check starter when ignition switch to ness and connec- motor circuit. <Ref. START? tor. to EN(H4DOTC)- 60, STARTER NOTE: MOTOR CIR-...
  • Page 206 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CS: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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 207 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) 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)-74, List of Diagnostic Trouble Code...
  • Page 208 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CT: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)-47, OP- ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>. WIRING DIAGRAM: •...

  • Page 209: Data Link Connector

    Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) • RHD model MAIN RELAY DATA LINK CONNECTOR SBF-5 IGNITION BATTERY SWITCH No.11 SBF-4 SBF-1 B134 B135 B136 B137 B137 B135 B136 11 12 13 14 15 16 17 11 12 13 14 15 16 17 18 19 11 12 13 14 15 18 19 20 21...
  • Page 210 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK INPUT SIGNAL FROM ECM. Is the voltage more than 10 V? Repair the poor Go to step 2. 1) Turn the ignition switch to OFF. contact in ECM 2) Measure the voltage between ECM and connector.
  • Page 211 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CU:DTC P2088 OCV SOLENOID VALVE SIGNAL A CIRCUIT OPEN (BANK 1) 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 212 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair open circuit Ω? FLOW CONTROL SOLENOID VALVE. in harness 1) Turn the ignition switch to OFF. between ECM and 2) Disconnect the connector from ECM and oil oil flow control...
  • Page 213 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CV:DTC P2089 OCV SOLENOID VALVE SIGNAL A CIRCUIT SHORT (BANK 1) 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 214 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair open circuit Ω? FLOW CONTROL SOLENOID VALVE. in harness 1) Turn the ignition switch to OFF. between ECM and 2) Disconnect the connector from ECM and oil oil flow control...
  • Page 215 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CW:DTC P2092 OCV SOLENOID VALVE SIGNAL A CIRCUIT OPEN (BANK 2) 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 216 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair open circuit Ω? FLOW CONTROL SOLENOID VALVE. in harness 1) Turn the ignition switch to OFF. between ECM and 2) Disconnect the connector from ECM and oil oil flow control...
  • Page 217 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) CX:DTC P2093 OCV SOLENOID VALVE SIGNAL A CIRCUIT SHORT (BANK 2) 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)-47, OP- ERATION, Clear Memory Mode.>...
  • Page 218 Diagnostic Procedure with Diagnostic Trouble Code (DTC) ENGINE (DIAGNOSTIC) Step Check CHECK HARNESS BETWEEN ECM AND OIL Is the resistance less than 1 Go to step 2. Repair open circuit Ω? FLOW CONTROL SOLENOID VALVE. in harness 1) Turn the ignition switch to OFF. between ECM and 2) Disconnect the connector from ECM and oil oil flow control...

  • Page 219: General Diagnostic Table

    General Diagnostic Table ENGINE (DIAGNOSTIC) 20.General Diagnostic Table A: INSPECTION 1. ENGINE NOTE: Malfunction of parts other than those listed is also possible. <Ref. to ME(H4DOTC)-118, Engine Trouble in General.> Symptom Problem parts 1) Idle air control solenoid valve 2) Manifold absolute pressure sensor 3) Mass air flow and intake air temperature sensor 4) Ignition parts (*1) 1.
  • Page 220 General Diagnostic Table ENGINE (DIAGNOSTIC) Symptom Problem parts 1) Manifold absolute pressure sensor 2) Mass air flow and intake air temperature sensor 3) Engine coolant temperature sensor (*2) 4) Crankshaft position sensor (*3) 6. Surging 5) Camshaft position sensor (*3) 6) Fuel injection parts (*4) 7) Throttle position sensor 8) Fuel pump and fuel pump relay...

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