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DTC P1604: STARTABILITY Malfunction: Notes

WARNING: This page is about a different variant/trim than selected.

1. - 

DTC detecting condition: 

Immediately at fault recognition

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

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CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
NOTE:
  1. CHECK DTC  .

    Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC other than P1604 displayed? (Current malfunction)

    Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

    No:  Go to  2.

  2. CHECK IMMOBILIZER  .

    Check the immobilizer. Ref. to IMMOBILIZER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

    Is the check result OK?

    Yes:  Go to  3.

    No:  Repair the immobilizer. Ref. to IMMOBILIZER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

  3. CHECK FOR MALFUNCTION OCCURRENCE  .

    Check for the condition of fault occurrence.

    Is it possible to reproduce the faulty phenomenon or to identify the faulty condition?

    Yes:  Go to  30.

    No:  Go to  4.

  4. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the values in [Engine Speed] and [Control module voltage].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value of [Engine Speed] 0 rpm?

    Yes: 

    No: 

    • When the value of [Engine Speed] is less than 250 rpm: Go to  12.
    • When the value of [Engine Speed] is 250 rpm or more: Go to  20.
  5. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the value in [Control module voltage].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value of [Control module voltage] less than 9 V?

    Yes:  It is possible that the engine friction is too large. Check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

    No: 

  6. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

    Check the installation condition of crankshaft position sensor.

    Is the crankshaft position sensor installed correctly?

    Yes:  Go to  7.

    No:  Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR>INSTALLATION .

  7. CHECK CRANKSHAFT POSITION SENSOR  .

    Check the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  8.

    No:  Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .

  8. CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the crankshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between crankshaft position sensor connector and engine ground.

    Connector and terminal 

    (E10) No. 3 (+) - Engine ground (-):

    Is the voltage 4.5 V or more?

    Yes:  Go to  9.

    No:  Repair the power supply circuit.

  9. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

    Connector and terminal 

    (E158) No. 66 - (E10) No. 1:

    (E158) No. 68 - (E10) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  10.

    No:  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.

  10. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between crankshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E10) No. 1 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  11.

    No:  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.

  11. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

  12. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the values in [Engine Coolant Temperature], [Ambient Temperature] and [Fuel Pump Duty].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value of [Engine Coolant Temperature] 120°C (248°F) or more? Or is the value of [Engine Coolant Temperature] 15°C (27°F) or more lower than that of [Ambient Temperature]?

    Yes:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

    No: 

  13. CHECK OF FUEL PUMP  .
    1. On "Active Test" item, select [Fuel Pump Relay] and perform ON/OFF drive operation.
      NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>ACTIVE TEST .
    2. Check if operating sound occurs in the fuel pump according to ON/OFF switching operation.

    Does the fuel pump emit operating sound?

    Yes:  Go to  15.

    No:  Go to  14.

  14. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION .

    Is the check result OK?

    Yes:  Check fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

    No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP .

  15. CHECK FUEL TANK  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.

    Check if any foreign matters such as iron powder exist in the fuel tank.

    Is there any foreign matter in the fuel tank?

    Yes:  Remove foreign matter from the fuel tank.

    No:  Go to  16.

  16. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    Is the measured value 350 - 450 kPa (3.5 - 4.6 kg/cm2 , 50 - 66 psi)?

    Yes:  Go to  17.

    No:  Check the fuel pump and fuel delivery line. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL DELIVERY AND EVAPORATION LINES>INSPECTION .

  17. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Commanded Fuel Rail Pressure A].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value in [Fuel Rail Pressure A] synchronized with the one in [Commanded Fuel Rail Pressure A] in all freeze frame data?

    Yes:  Go to  18.

    No:  Check the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>HIGH PRESSURE FUEL PUMP>INSPECTION .

  18. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from ECM and fuel injectors.
    3. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector and terminal 

    #1 (E158) No. 96 - (E5) No. 1:

    #1 (E158) No. 87 - (E5) No. 2:

    #2 (E158) No. 95 - (E16) No. 1:

    #2 (E158) No. 86 - (E16) No. 2:

    #3 (E158) No. 93 - (E6) No. 1:

    #3 (E158) No. 84 - (E6) No. 2:

    #4 (E158) No. 94 - (E17) No. 1:

    #4 (E158) No. 85 - (E17) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  19.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between ECM connector and fuel injector connector
    • Poor contact of coupling connector
  19. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR (SHORT TO GROUND)  .

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    #1 (E158) No. 96 - Engine ground:

    #1 (E158) No. 87 - Engine ground:

    #2 (E158) No. 95 - Engine ground:

    #2 (E158) No. 86 - Engine ground:

    #3 (E158) No. 93 - Engine ground:

    #3 (E158) No. 84 - Engine ground:

    #4 (E158) No. 94 - Engine ground:

    #4 (E158) No. 85 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  29.

    No:  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.

  20. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the values in [Engine Coolant Temperature], [Ambient Temperature] and [Engine Speed].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value of [Engine Coolant Temperature] 120°C (248°F) or more? Or is the value of [Engine Coolant Temperature] 15°C (27°F) or more lower than that of [Ambient Temperature]?

    Yes:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

    No: 

  21. CHECK FUEL INJECTOR  .

    Check fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR>INSPECTION .

    Is there any deposit in the fuel injectors?

    Yes:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

    No:  Go to  22.

  22. CHECK FUEL TANK  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.

    Check if any foreign matters such as iron powder exist in the fuel tank.

    Is there any foreign matter in the fuel tank?

    Yes:  Remove foreign matter from the fuel tank.

    No:  Go to  23.

  23. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the value in [Engine Coolant Temperature].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value of [Engine Coolant Temperature] 40 - 90°C (104 - 194°F)?

    Yes:  Go to  25.

    No:  Go to  24.

  24. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.

    Is the measured value 147 kPa (1.5 kg/cm2 , 21 psi) or more?

    Yes:  Go to  29.

    No:  Replace the pressure regulator. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL FILTER .

  25. CHECK FUEL INJECTOR  .
    1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
    2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
    NOTE: Remove the vacuum hose between intake manifold and purge solenoid valve and perform the measurement. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION>COMPONENT>FUEL PIPE .

    Is the HC concentration less than 4, 000 ppm?

    Yes:  Go to  27.

    No:  Go to  26.

  26. CHECK FUEL INJECTOR  .

    Check fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  27.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  27. CHECK THROTTLE BODY  .

    Check throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>THROTTLE BODY>INSPECTION .

    Is there any deposit in the throttle body?

    Yes:  Replace the throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>THROTTLE BODY .

    No:  Go to  28.

  28. CHECK AIR INTAKE SYSTEM  .

    Check the installing condition of the air intake system.

    Are there holes, loose bolts or disconnection of hose on air intake system?

    Yes:  Repair the air intake system. Ref. to INTAKE (INDUCTION) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION .

    No:  Go to  29.

  29. CHECK FOR MALFUNCTION OCCURRENCE  .

    Check for the condition of fault occurrence.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Go to  30.

  30. CHECK FOR MALFUNCTION OCCURRENCE  .

    Check for the condition of fault occurrence.

    Does cranking occur?

    Yes: 

    • When the engine speed is abnormal during cranking: Go to  37.
    • When an initial combustion does not occur: Go to  40.
    • When the engine stalls immediately after engine start: Go to  57.
    • When the engine takes time to start: Go to  80.

    No:  Go to  31.

  31. CHECK FOR MALFUNCTION OCCURRENCE  .

    Check for the condition of fault occurrence.

    Does the sound occur by a protruding starter pinion gear during cranking?

    Yes: 

    • When the starter motor does not rotate: Go to  32.
    • When the starter motor rotates but does not engage: Go to  34.

    No:  Go to  35.

  32. CHECK BATTERY  .

    Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY>INSPECTION .

    Is the check result OK?

    Yes:  Go to  33.

    No:  Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY .

  33. CHECK ENGINE MAIN BODY  .

    Using the ST, rotate the crankshaft.

    ST 18252AA000 CRANKSHAFT SOCKET 

    Does the crankshaft rotate smoothly?

    Yes:  Check the starter motor. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER>INSPECTION .

    NOTE: It is possible that the engine friction increased temporarily. Check if any foreign matter is mixed in engine oil. If a foreign matter is found, check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

    No:  It is possible that the engine friction is too large. Check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

  34. CHECK STARTER MOTOR  .

    Check the starter motor. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER>INSPECTION .

    Is there any wear or damage in the starter pinion gear?

    Yes:  Repair the starter motor. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER .

    No:  CVT model: Replace the torque converter assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TORQUE CONVERTER ASSEMBLY . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TORQUE CONVERTER . MT model: Replace the flexible flywheel. Ref. to CLUTCH SYSTEM>FLYWHEEL .

  35. CHECK BATTERY  .

    Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY>INSPECTION .

    Is the check result OK?

    Yes:  Go to  36.

    No:  Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY .

  36. CHECK STARTER MOTOR  .

    Check the starter motor. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER>INSPECTION .

    Is the check result OK?

    Yes:  Check the starter motor circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>STARTER MOTOR CIRCUIT .

    No:  Repair the starter motor. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER .

  37. CHECK DATA MONITOR  .

    Using the Subaru Select Monitor, read the value of [Engine Speed] during cranking.

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Is the value of [Engine Speed] 300 rpm or more?

    Yes:  It is possible that the compression pressure of the engine is not sufficient. Check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

    No:  Go to  38.

  38. CHECK BATTERY  .

    Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY>INSPECTION .

    Is the check result OK?

    Yes:  Go to  39.

    No:  Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>BATTERY .

  39. CHECK ENGINE MAIN BODY  .

    Using the ST, rotate the crankshaft.

    ST 18252AA000 CRANKSHAFT SOCKET 

    Does the crankshaft rotate smoothly?

    Yes:  Check the starter motor. Ref. to STARTING/CHARGING SYSTEMS (H4DO (EXCEPT FOR HEV))>STARTER>INSPECTION .

    NOTE: It is possible that the engine friction increased temporarily. Check if any foreign matter is mixed in engine oil. If a foreign matter is found, check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

    No:  It is possible that the engine friction is too large. Check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

  40. CHECK OPERATION OF EACH FUEL INJECTOR  .

    Using a sound scope, check each fuel injector for operation sound during cranking.

    Does the fuel injector emit operating sound?

    Yes:  Go to  41.

    No:  Go to  54.

  41. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    Is the measured value 350 - 450 kPa (3.5 - 4.6 kg/cm2 , 50 - 66 psi)?

    Yes:  Go to  42.

    No:  Go to  52.

  42. CHECK IGNITION CONDITION  .

    Check the ignition condition. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

    Is the check result OK?

    Yes:  Go to  43.

    No:  Go to  46.

  43. CHECK FOR MALFUNCTION OCCURRENCE  .

    Check for the condition of fault occurrence.

    Does the fault occur only within approx. 15 to 120 minutes after the engine is stopped?

    Yes:  Go to  45.

    No: 

    • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to  44.
    • When the fault occurrence pattern is inconsistent: Go to  94.
  44. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.

    Is the measured value 147 kPa (1.5 kg/cm2 , 21 psi) or more?

    Yes:  Go to  94.

    No:  Replace the pressure regulator. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL FILTER .

  45. CHECK FUEL INJECTOR  .
    1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
    2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
    NOTE: Remove the vacuum hose between intake manifold and purge solenoid valve and perform the measurement. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION>COMPONENT>FUEL PIPE .

    Is the HC concentration less than 4, 000 ppm?

    Yes:  Go to  94.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  46. CHECK SPARK PLUG  .

    Check the spark plug. Ref. to IGNITION (H4DO (EXCEPT FOR HEV))>SPARK PLUG>INSPECTION .

    Is the check result OK?

    Yes:  Go to  47.

    No:  Replace all spark plugs on all cylinders. Ref. to IGNITION (H4DO (EXCEPT FOR HEV))>SPARK PLUG .

  47. CHECK DATA MONITOR  .

    Using the Subaru Select Monitor, record the value of [Engine Speed] during cranking.

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Does the recorded value of [Engine Speed] contain data of 0 rpm?

    Yes:  It is possible that temporary fault occurs in the crankshaft position sensor circuit. Check the crankshaft position sensor circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0335: CRANKSHAFT POSITION SENSOR "A" CIRCUIT .

    No:  Go to  48.

  48. CHECK IGNITION COIL POWER SUPPLY CIRCUIT  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ignition coil.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between ignition coil connector and engine ground.

    Connector and terminal 

    (E31) No. 1 (+) - Engine ground (-):

    (E32) No. 1 (+) - Engine ground (-):

    (E33) No. 1 (+) - Engine ground (-):

    (E34) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  49.

    No:  Check the harness and connector.

    NOTE: In this case, repair the following item:
    • Open or short to ground in power supply circuit
    • Blown out of fuse
    • Poor contact of coupling connector
    • Poor contact of J/C
  49. CHECK HARNESS BETWEEN ECM AND IGNITION COIL (OPEN)  .
    1. Disconnect the connector from ECM.
    2. Measure the resistance of harness between ECM connector and ignition coil connector.

    Connector and terminal 

    (E158) No. 10 - (E31) No. 2:

    (E158) No. 11 - (E32) No. 2:

    (E158) No. 12 - (E33) No. 2:

    (E158) No. 13 - (E34) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  50.

    No:  Repair the open circuit in harness between ECM connector and ignition coil connector.

  50. CHECK HARNESS BETWEEN ECM AND IGNITION COIL (SHORT TO GROUND)  .

    Measure the resistance of harness between ECM connector and engine ground.

    Connector and terminal 

    (E158) No. 10 - Engine ground:

    (E158) No. 11 - Engine ground:

    (E158) No. 12 - Engine ground:

    (E158) No. 13 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  51.

    No:  Repair the ground short circuit of harness between ECM connector and ignition coil connector.

  51. CHECK HARNESS OF IGNITION COIL GROUND CIRCUIT (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Measure the resistance of harness between ignition coil connector and engine ground.
    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E31) No. 3 - Engine ground:

    (E32) No. 3 - Engine ground:

    (E33) No. 3 - Engine ground:

    (E34) No. 3 - Engine ground:

    Is the resistance less than 5 Ω?

    Yes:  Replace the ignition coil. Ref. to IGNITION (H4DO (EXCEPT FOR HEV))>IGNITION COIL . If the fault occurs after servicing, continue the diagnosis. Go to  99.

    No:  Repair the open circuit in harness between ignition coil connector and engine grounding terminal.

  52. CHECK OF FUEL PUMP  .
    1. On "Active Test" item, select [Fuel Pump Relay] and perform ON/OFF drive operation.
      NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>ACTIVE TEST .
    2. Check if operating sound occurs in the fuel pump according to ON/OFF switching operation.

    Does the fuel pump emit operating sound?

    Yes:  Check the fuel pump and fuel delivery line. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL DELIVERY AND EVAPORATION LINES>INSPECTION .

    No:  Go to  53.

  53. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION .

    Is the check result OK?

    Yes:  Check fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

    If the fault occurs after servicing, continue the diagnosis. Go to  94.

    No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP .

  54. CHECK DATA MONITOR  .

    Using the Subaru Select Monitor, record the value of [Engine Speed] during cranking.

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Does the recorded value of [Engine Speed] contain data of 0 rpm?

    Yes:  It is possible that temporary fault occurs in the crankshaft position sensor circuit. Check the crankshaft position sensor circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0335: CRANKSHAFT POSITION SENSOR "A" CIRCUIT .

    No:  Go to  55.

  55. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from ECM and fuel injectors.
    3. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector and terminal 

    #1 (E158) No. 96 - (E5) No. 1:

    #1 (E158) No. 87 - (E5) No. 2:

    #2 (E158) No. 95 - (E16) No. 1:

    #2 (E158) No. 86 - (E16) No. 2:

    #3 (E158) No. 93 - (E6) No. 1:

    #3 (E158) No. 84 - (E6) No. 2:

    #4 (E158) No. 94 - (E17) No. 1:

    #4 (E158) No. 85 - (E17) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  56.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between ECM connector and fuel injector connector
    • Poor contact of coupling connector
  56. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR (SHORT TO GROUND)  .

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    #1 (E158) No. 96 - Engine ground:

    #1 (E158) No. 87 - Engine ground:

    #2 (E158) No. 95 - Engine ground:

    #2 (E158) No. 86 - Engine ground:

    #3 (E158) No. 93 - Engine ground:

    #3 (E158) No. 84 - Engine ground:

    #4 (E158) No. 94 - Engine ground:

    #4 (E158) No. 85 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

    No:  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.

  57. CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR  .

    Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  58.

    No:  Go to  78.

  58. CHECK AIR INTAKE SYSTEM  .

    Check the installing condition of the air intake system.

    Are there holes, loose bolts or disconnection of hose on air intake system?

    Yes:  Repair the air intake system. Ref. to INTAKE (INDUCTION) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION .

    No:  Go to  59.

  59. CHECK THROTTLE BODY  .
    1. Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
    2. Disconnect the connector from the throttle body.
    3. Check throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>THROTTLE BODY>INSPECTION .

    Is the check result OK?

    Yes:  Go to  60.

    No:  Replace the throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>THROTTLE BODY .

  60. CHECK THROTTLE BODY  .

    Check throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>THROTTLE BODY>INSPECTION .

    Is there any deposit in the throttle body?

    Yes:  Replace the throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>THROTTLE BODY .

    No:  Go to  61.

  61. CHECK FREEZE FRAME DATA  .
    1. Using the Subaru Select Monitor, read the values in [VVT Adv. Ang. Amount R], [VVT Advance Target Angle Amount R], [VVT Adv. Ang. Amount L], [VVT Advance Target Angle Amount L], [Exh. VVT Retard Ang. R], [Ex VVT Retard Target Angle R], [Exh. VVT Retard Ang. L] and [Ex VVT Retard Target Angle L].
      NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .
    2. Using the Subaru Select Monitor, compare the respective values between the followings: [VVT Adv. Ang. Amount R] and [VVT Advance Target Angle Amount R], [VVT Adv. Ang. Amount L] and [VVT Advance Target Angle Amount L], [Exh. VVT Retard Ang. R] and [Ex VVT Retard Target Angle R], [Exh. VVT Retard Ang. L] and [Ex VVT Retard Target Angle L].

    Does all of the advance angle amount and retard angle amount synchronize with their target values?

    Yes:  Go to  112.

    No:  Diagnose the part where there is difference of 10 deg or more.

    • Intake RH: Go to  62.
    • Intake LH: Go to  66.
    • Exhaust RH: Go to  70.
    • Exhaust LH: Go to  74.
  62. CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID RH  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the intake oil control solenoid RH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between intake oil control solenoid RH connector and engine ground.

    Connector and terminal 

    (E38) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  63.

    No:  Check the harnesses and connectors, and repair or replace them if necessary.

    NOTE: In this case, repair the following item:
    • Power supply circuit
    • Poor contact of coupling connector
    • Poor contact of J/C
  63. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and intake oil control solenoid RH connector.

    Connector and terminal 

    (E158) No. 99 - (E38) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  64.

    No:  Repair the open circuit in harness between ECM connector and intake oil control solenoid RH connector.

  64. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH (SHORT TO GROUND)  .

    Measure the resistance between intake oil control solenoid RH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E38) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  65.

    No:  Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid RH connector.

  65. CHECK INTAKE OIL CONTROL SOLENOID RH  .

    Check the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID>INSPECTION .

    Is the check result OK?

    Yes:  Replace the intake cam sprocket RH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

    No:  Replace the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID .

  66. CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID LH  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the intake oil control solenoid LH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between intake oil control solenoid LH connector and engine ground.

    Connector and terminal 

    (E37) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  67.

    No:  Check the harnesses and connectors, and repair or replace them if necessary.

    NOTE: In this case, repair the following item:
    • Power supply circuit
    • Poor contact of coupling connector
    • Poor contact of J/C
  67. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and intake oil control solenoid LH.

    Connector and terminal 

    (E158) No. 100 - (E37) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  68.

    No:  Repair the open circuit in harness between ECM connector and intake oil control solenoid LH connector.

  68. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH (SHORT TO GROUND)  .

    Measure the resistance between intake oil control solenoid LH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E37) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  69.

    No:  Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.

  69. CHECK INTAKE OIL CONTROL SOLENOID LH  .

    Check the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID>INSPECTION .

    Is the check result OK?

    Yes:  Replace the intake cam sprocket LH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

    No:  Replace the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID .

  70. CHECK POWER SUPPLY TO THE EXHAUST OIL CONTROL SOLENOID RH  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the exhaust oil control solenoid RH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between exhaust oil control solenoid RH connector and engine ground.

    Connector and terminal 

    (E63) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  71.

    No:  Check the harnesses and connectors, and repair or replace them if necessary.

    NOTE: In this case, repair the following item:
    • Power supply circuit
    • Poor contact of coupling connector
    • Poor contact of J/C
  71. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID RH (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and exhaust oil control solenoid RH connector.

    Connector and terminal 

    (E158) No. 108 - (E63) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  72.

    No:  Repair the open circuit in harness between ECM connector and exhaust oil control solenoid RH connector.

  72. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH (SHORT TO GROUND)  .

    Measure the resistance between exhaust oil control solenoid RH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E63) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  73.

    No:  Repair the short circuit to ground in harness between ECM connector and exhaust oil control solenoid RH connector.

  73. CHECK INTAKE OIL CONTROL SOLENOID RH  .

    Check the exhaust oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID>INSPECTION .

    Is the check result OK?

    Yes:  Replace the exhaust cam sprocket RH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

    No:  Replace the exhaust oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID .

  74. CHECK POWER SUPPLY TO THE EXHAUST OIL CONTROL SOLENOID LH  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the exhaust oil control solenoid LH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between exhaust oil control solenoid LH connector and engine ground.

    Connector and terminal 

    (E66) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  75.

    No:  Check the harnesses and connectors, and repair or replace them if necessary.

    NOTE: In this case, repair the following item:
    • Power supply circuit
    • Poor contact of coupling connector
    • Poor contact of J/C
  75. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID LH (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and exhaust oil control solenoid LH connector.

    Connector and terminal 

    (E158) No. 109 - (E66) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  76.

    No:  Repair the open circuit in harness between ECM connector and exhaust oil control solenoid LH connector.

  76. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID LH (SHORT TO GROUND)  .

    Measure the resistance between exhaust oil control solenoid LH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E66) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  77.

    No:  Repair the short circuit to ground in harness between ECM connector and exhaust oil control solenoid LH connector.

  77. CHECK EXHAUST OIL CONTROL SOLENOID LH  .

    Check the exhaust oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID>INSPECTION .

    Is the check result OK?

    Yes:  Replace the exhaust cam sprocket LH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

    No:  Replace the exhaust oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>OIL CONTROL SOLENOID .

  78. CHECK HARNESS BETWEEN ECM AND THE MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR, AND ECM AND THE MANIFOLD ABSOLUTE PRESSURE SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Disconnect the connectors from the mass air flow and intake air temperature sensor.
    4. Disconnect the connector from manifold absolute pressure sensor.
    5. Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector, and between ECM connector and the manifold absolute pressure sensor connector.

    Connector and terminal 

    (B134) No. 32 - (B3) No. 1:

    (B134) No. 54 - (B3) No. 2:

    (B134) No. 53 - (B3) No. 3:

    (B134) No. 43 - (B3) No. 4:

    (E158) No. 41 - (E21) No. 1:

    (E158) No. 58 - (E21) No. 2:

    (E158) No. 69 - (E21) No. 3:

    Is the resistance less than 1 Ω?

    Yes:  Go to  79.

    No:  Check the harnesses and connectors, and repair or replace them if necessary.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between ECM connector and the mass air flow and intake air temperature sensor connector
    • Open circuit of harness between ECM connector and manifold absolute pressure sensor connector
    • Poor contact of J/C
  79. CHECK HARNESS BETWEEN ECM AND THE MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR, AND BETWEEN ECM AND THE MANIFOLD ABSOLUTE PRESSURE SENSOR (SHORT TO GROUND)  .

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (B134) No. 32 - Engine ground:

    (B134) No. 53 - Engine ground:

    (B134) No. 43 - Engine ground:

    (E158) No. 41 - Engine ground:

    (E158) No. 69 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Replace the mass air flow and intake air temperature sensor or the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR . If the fault occurs after servicing, continue the diagnosis. Go to  112.

    No:  Check the harnesses and connectors, and repair or replace them if necessary.

    NOTE: In this case, repair the following item:
    • Short circuit to ground in harness between ECM connector and the mass air flow and intake air temperature sensor connector
    • Short circuit to ground in harness between ECM connector and manifold absolute pressure sensor connector
  80. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  81.

    No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR . If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  123.

  81. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from ECM and engine coolant temperature sensor.
    3. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

    Connector and terminal 

    (E158) No. 58 - (E8) No. 1:

    (E158) No. 59 - (E8) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  82.

    No:  Repair the harness and connector. If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  123.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between ECM connector and engine coolant temperature sensor connector
    • Poor contact of J/C
  82. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR (SHORT TO GROUND)  .

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E158) No. 59 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  83.

    No:  Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector. If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  123.

  83. CHECK DATA MONITOR  .
    1. Turn the ignition switch to ON. (Engine OFF)
    2. Using the Subaru Select Monitor, read the values in [Long term fuel trim B1] and [Barometric Pressure].
    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Is the value of [Long term fuel trim B1] -25 - 25 %? And is the value of [Barometric Pressure] 80 kPa or more?

    Yes:  Go to  86.

    No:  Go to  84.

  84. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    2. Start the engine.

    Does the engine start?

    Yes:  Go to  85.

    No:  Go to  86.

  85. CHECK IDLE SPEED  .

    Check the idle speed.

    Is the idle speed stable?

    Yes:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

    If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  123.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR . If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  123.

  86. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    Is the measured value 350 - 450 kPa (3.5 - 4.6 kg/cm2 , 50 - 66 psi)?

    Yes:  Go to  87.

    No:  Go to  93.

  87. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Commanded Fuel Rail Pressure A].

    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .

    Is the value in [Fuel Rail Pressure A] synchronized with the one in [Commanded Fuel Rail Pressure A] in all freeze frame data?

    Yes:  Go to  88.

    No:  Check the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>HIGH PRESSURE FUEL PUMP>INSPECTION .

  88. CHECK SPARK PLUG  .

    Check all spark plugs on all cylinders. Ref. to IGNITION (H4DO (EXCEPT FOR HEV))>SPARK PLUG .

    Is the check result OK?

    Yes:  Go to  89.

    No: 

    • When spark plugs in some cylinders are faulty: Replace the faulty spark plugs of the cylinders, then check the ignition system and fuel system in the faulty cylinders. Ref. to IGNITION (H4DO (EXCEPT FOR HEV))>SPARK PLUG . If the fault occurs after servicing, continue the diagnosis. Go to  123.
    • When all spark plugs in all cylinders are faulty: Replace faulty spark plugs in all cylinders. Ref. to IGNITION (H4DO (EXCEPT FOR HEV))>SPARK PLUG . If the fault occurs after servicing, continue the diagnosis. Go to  123.
  89. CHECK FOR MALFUNCTION OCCURRENCE  .

    Check for the condition of fault occurrence.

    Does the fault occur only within approx. 15 to 120 minutes after the engine is stopped?

    Yes:  Go to  91.

    No: 

    • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to  90.
    • When the fault occurrence pattern is inconsistent: Go to  123.
  90. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.

    Is the measured value 147 kPa (1.5 kg/cm2 , 21 psi) or more?

    Yes:  Go to  123.

    No:  Replace the pressure regulator. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL FILTER .

  91. CHECK PURGE CONTROL SOLENOID VALVE  .

    Check the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>PURGE CONTROL SOLENOID VALVE>INSPECTION .

    Is the check result OK?

    Yes:  Go to  92.

    No:  Replace the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>PURGE CONTROL SOLENOID VALVE .

  92. CHECK FUEL INJECTOR  .
    1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
    2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
    NOTE: Remove the vacuum hose between intake manifold and purge solenoid valve and perform the measurement. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION>COMPONENT>FUEL PIPE .

    Is the HC concentration less than 4, 000 ppm?

    Yes:  Go to  123.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  93. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION .

    Is the check result OK?

    Yes:  Check fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

    If the fault occurs after servicing, continue the diagnosis. Go to  123.

    No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP .

  94. CHECK FUEL INJECTOR  .

    Check fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  95.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  95. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from ECM and fuel injectors.
    3. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector and terminal 

    #1 (E158) No. 96 - (E5) No. 1:

    #1 (E158) No. 87 - (E5) No. 2:

    #2 (E158) No. 95 - (E16) No. 1:

    #2 (E158) No. 86 - (E16) No. 2:

    #3 (E158) No. 93 - (E6) No. 1:

    #3 (E158) No. 84 - (E6) No. 2:

    #4 (E158) No. 94 - (E17) No. 1:

    #4 (E158) No. 85 - (E17) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  96.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between ECM connector and fuel injector connector
    • Poor contact of coupling connector
  96. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR (SHORT TO GROUND)  .

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    #1 (E158) No. 96 - Engine ground:

    #1 (E158) No. 87 - Engine ground:

    #2 (E158) No. 95 - Engine ground:

    #2 (E158) No. 86 - Engine ground:

    #3 (E158) No. 93 - Engine ground:

    #3 (E158) No. 84 - Engine ground:

    #4 (E158) No. 94 - Engine ground:

    #4 (E158) No. 85 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  97.

    No:  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.

  97. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Go to  98.

  98. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the camshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

  99. CHECK CRANKSHAFT POSITION SENSOR  .

    Check the installation condition of crankshaft position sensor.

    Is the crankshaft position sensor installed correctly?

    Yes:  Go to  100.

    No:  Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR>INSTALLATION .

  100. CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR  .

    Check the installation condition of camshaft position sensor.

    Is the camshaft position sensor installed correctly?

    Yes:  Go to  101.

    No:  Install the camshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR>INSTALLATION .

  101. CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the crankshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between crankshaft position sensor connector and engine ground.

    Connector and terminal 

    (E10) No. 3 (+) - Engine ground (-):

    Is the voltage 4.5 V or more?

    Yes:  Go to  102.

    No:  Repair the power supply circuit.

  102. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

    Connector and terminal 

    (E158) No. 66 - (E10) No. 1:

    (E158) No. 68 - (E10) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  103.

    No:  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.

  103. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between crankshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E10) No. 1 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  104.

    No:  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.

  104. CHECK POWER SUPPLY OF INTAKE CAMSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the intake camshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between intake camshaft position sensor connector and engine ground.

    Connector and terminal 

    (E35) No. 1 (+) - Engine ground (-):

    (E36) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  105.

    No:  Repair the harness and connector.

    NOTE:
    • Open circuit or short circuit to ground in harness between main relay connector and intake camshaft position sensor connector
    • Poor contact of coupling connector
    • Poor contact of J/C
  105. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance between ECM connector and intake camshaft position sensor connector.

    Connector and terminal 

    (E158) No. 77 - (E35) No. 2:

    (E158) No. 51 - (E35) No. 3:

    (E158) No. 78 - (E36) No. 2:

    (E158) No. 51 - (E36) No. 3:

    Is the resistance less than 1 Ω?

    Yes:  Go to  106.

    No:  Repair the harness and connector.

    NOTE:
    • Open circuit in the harness between ECM connector and intake camshaft position sensor connector
    • Poor contact of J/C
  106. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between intake camshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E35) No. 2 - Engine ground:

    (E36) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  107.

    No:  Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.

  107. CHECK POWER SUPPLY OF EXHAUST CAMSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the exhaust camshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between exhaust camshaft position sensor connector and engine ground.

    Connector and terminal 

    (E62) No. 1 (+) - Engine ground (-):

    (E65) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  108.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between main relay and exhaust camshaft position sensor connector
    • Poor contact of coupling connector
    • Poor contact of J/C
  108. CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance between ECM connector and exhaust camshaft position sensor connector.

    Connector and terminal 

    (E158) No. 65 - (E62) No. 2:

    (E158) No. 51 - (E62) No. 3:

    (E158) No. 64 - (E65) No. 2:

    (E158) No. 51 - (E65) No. 3:

    Is the resistance less than 1 Ω?

    Yes:  Go to  109.

    No:  Repair the harness and connector.

    NOTE:
    • Open circuit in harness between ECM connector and exhaust camshaft position sensor connector
    • Poor contact of J/C
  109. CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between exhaust camshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E62) No. 2 - Engine ground:

    (E65) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  110.

    No:  Repair short circuit to ground in the harness between ECM connector and exhaust camshaft position sensor connector.

  110. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Go to  111.

  111. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the camshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

  112. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  113.

    No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

  113. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure during cranking or when 5 minutes have passed after the engine stopped. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.

    Is the fuel pressure during cranking 325 - 450 kPa (3.3 - 4.6 kg/cm2 , 47 - 66 psi), and is the fuel pressure five minutes after engine stop 147 kPa (1.5 kg/cm2 , 21 psi) or more?

    Yes:  Go to  114.

    No:  Go to  122.

  114. CHECK DATA MONITOR  .
    1. Turn the ignition switch to ON. (Engine OFF)
    2. Using the Subaru Select Monitor, read the value in [Long term fuel trim B1].
    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Does the value of [Long term fuel trim B1] fall within a range of -15 - 15 %?

    Yes:  Go to  115.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  115. CHECK FOR MALFUNCTION OCCURRENCE  .

    Start the engine and check the idling speed.

    Is the idling speed stable all time?

    Yes:  It is possible that the fault comes from fuel. Replace fuel.

    No:  Go to  116.

  116. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

    Check the installation condition of crankshaft position sensor.

    Is the crankshaft position sensor installed correctly?

    Yes:  Go to  117.

    No:  Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR>INSTALLATION .

  117. CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the crankshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between crankshaft position sensor connector and engine ground.

    Connector and terminal 

    (E10) No. 3 (+) - Engine ground (-):

    Is the voltage 4.5 V or more?

    Yes:  Go to  118.

    No:  Repair the power supply circuit.

  118. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

    Connector and terminal 

    (E158) No. 66 - (E10) No. 1:

    (E158) No. 68 - (E10) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  119.

    No:  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.

  119. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between crankshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E10) No. 1 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  120.

    No:  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.

  120. CHECK COMPRESSION PRESSURE  .

    Check the compression pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>COMPRESSION .

    Is the check result OK?

    Yes:  Go to  121.

    No:  Check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES .

  121. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Check the valve timing. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>TIMING CHAIN ASSEMBLY . When the valve timing is normal, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

  122. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION .

    Is the check result OK?

    Yes:  Check fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

    No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP .

  123. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION:
    • Be careful not to spill fuel.
    • Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Measure the fuel pressure during cranking or when 5 minutes have passed after the engine stopped. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

    NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.

    Is the fuel pressure during cranking 325 - 450 kPa (3.3 - 4.6 kg/cm2 , 47 - 66 psi), and is the fuel pressure five minutes after engine stop 147 kPa (1.5 kg/cm2 , 21 psi) or more?

    Yes:  Go to  124.

    No:  Go to  131.

  124. CHECK DATA MONITOR  .
    1. Turn the ignition switch to ON. (Engine OFF)
    2. Using the Subaru Select Monitor, read the value in [Long term fuel trim B1].
    NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

    Does the value of [Long term fuel trim B1] fall within a range of -15 - 15 %?

    Yes:  Go to  125.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  125. CHECK FOR MALFUNCTION OCCURRENCE  .

    Start the engine and check the idling speed.

    Is the idling speed stable all time?

    Yes:  It is possible that the fault comes from fuel. Replace fuel.

    No:  Go to  126.

  126. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

    Check the installation condition of crankshaft position sensor.

    Is the crankshaft position sensor installed correctly?

    Yes:  Go to  127.

    No:  Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR>INSTALLATION .

  127. CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the crankshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between crankshaft position sensor connector and engine ground.

    Connector and terminal 

    (E10) No. 3 (+) - Engine ground (-):

    Is the voltage 4.5 V or more?

    Yes:  Go to  128.

    No:  Repair the power supply circuit.

  128. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

    Connector and terminal 

    (E158) No. 66 - (E10) No. 1:

    (E158) No. 68 - (E10) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  129.

    No:  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.

  129. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between crankshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E10) No. 1 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  130.

    No:  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.

  130. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

  131. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP>INSPECTION .

    Is the check result OK?

    Yes:  Go to  132.

    No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PUMP .

  132. CHECK FUEL PUMP SYSTEM  .

    Check fuel pump circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

    Is the check result OK?

    Yes:  Go to  133.

    No:  Repair the fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

  133. CHECK PURGE CONTROL SOLENOID VALVE  .

    Check the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>PURGE CONTROL SOLENOID VALVE>INSPECTION .

    Is the check result OK?

    Yes:  Go to  134.

    No:  Replace the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (EXCEPT FOR HEV))>PURGE CONTROL SOLENOID VALVE .

  134. CHECK FUEL INJECTOR  .
    1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
    2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
    NOTE: Remove the vacuum hose between intake manifold and purge solenoid valve and perform the measurement. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION>COMPONENT>FUEL PIPE .

    Is the HC concentration less than 4, 000 ppm?

    Yes:  Go to  135.

    No:  Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL INJECTOR .

  135. CHECK INTAKE VALVE  .

    Check the intake valve. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CYLINDER HEAD>INSPECTION .

    Is there any deposit in the intake valve?

    Yes:  Clean the intake valve. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CYLINDER HEAD .

    No:  Go to  136.

  136. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

    Is the check result OK?

    Yes:  Go to  137.

    No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

  137. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

    Check the installation condition of crankshaft position sensor.

    Is the crankshaft position sensor installed correctly?

    Yes:  Go to  138.

    No:  Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR>INSTALLATION .

  138. CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR  .

    Check the installation condition of camshaft position sensor.

    Is the camshaft position sensor installed correctly?

    Yes:  Go to  139.

    No:  Install the camshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR>INSTALLATION .

  139. CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the crankshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between crankshaft position sensor connector and engine ground.

    Connector and terminal 

    (E10) No. 3 (+) - Engine ground (-):

    Is the voltage 4.5 V or more?

    Yes:  Go to  140.

    No:  Repair the power supply circuit.

  140. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

    Connector and terminal 

    (E158) No. 66 - (E10) No. 1:

    (E158) No. 68 - (E10) No. 2:

    Is the resistance less than 1 Ω?

    Yes:  Go to  141.

    No:  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.

  141. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between crankshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E10) No. 1 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  142.

    No:  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.

  142. CHECK POWER SUPPLY TO INTAKE CAMSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the intake camshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between intake camshaft position sensor connector and engine ground.

    Connector and terminal 

    (E35) No. 1 (+) - Engine ground (-):

    (E36) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  143.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit or short circuit to ground in harness between main relay connector and intake camshaft position sensor connector
    • Poor contact of coupling connector
    • Poor contact of J/C
  143. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance between ECM connector and intake camshaft position sensor connector.

    Connector and terminal 

    (E158) No. 77 - (E35) No. 2:

    (E158) No. 51 - (E35) No. 3:

    (E158) No. 78 - (E36) No. 2:

    (E158) No. 51 - (E36) No. 3:

    Is the resistance less than 1 Ω?

    Yes:  Go to  144.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in the harness between ECM connector and intake camshaft position sensor connector
    • Poor contact of J/C
  144. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between intake camshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E35) No. 2 - Engine ground:

    (E36) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  145.

    No:  Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.

  145. CHECK POWER SUPPLY OF EXHAUST CAMSHAFT POSITION SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the exhaust camshaft position sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between exhaust camshaft position sensor connector and engine ground.

    Connector and terminal 

    (E62) No. 1 (+) - Engine ground (-):

    (E65) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    Yes:  Go to  146.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between main relay and exhaust camshaft position sensor connector
    • Poor contact of coupling connector
    • Poor contact of J/C
  146. CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR (OPEN)  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance between ECM connector and exhaust camshaft position sensor connector.

    Connector and terminal 

    (E158) No. 65 - (E62) No. 2:

    (E158) No. 51 - (E62) No. 3:

    (E158) No. 64 - (E65) No. 2:

    (E158) No. 51 - (E65) No. 3:

    Is the resistance less than 1 Ω?

    Yes:  Go to  147.

    No:  Repair the harness and connector.

    NOTE: In this case, repair the following item:
    • Open circuit in harness between ECM connector and exhaust camshaft position sensor connector
    • Poor contact of J/C
  147. CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR (SHORT TO GROUND)  .

    Measure the resistance between exhaust camshaft position sensor connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector and terminal 

    (E62) No. 2 - Engine ground:

    (E65) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  148.

    No:  Repair short circuit to ground in the harness between ECM connector and exhaust camshaft position sensor connector.

  148. CHECK COMPRESSION PRESSURE  .

    Check the compression pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>COMPRESSION .

    Is the check result OK?

    Yes:  Go to  149.

    No:  Check the engine. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES .

  149. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CRANKSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Go to  150.

  150. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the camshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>CAMSHAFT POSITION SENSOR .
    2. Check that the fault is removed.

    Is the fault removed?

    Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

    No:  Check the valve timing. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>TIMING CHAIN ASSEMBLY . When the valve timing is normal, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

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