DTC P1604 STARTABILITY Malfunction: Notes

DTC detecting condition: 

Immediately at fault recognition

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

1. CHECK DTC  .

   Is any other DTC displayed?

   • Yes: Check DTC using "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>List of Diagnostic Trouble Code (DTC) .
   • No: Go to  2.
2. CHECK IMMOBILIZER  .

   Check the immobilizer. Ref. to IMMOBILIZER (DIAGNOSTICS)>Basic Diagnostic Procedure .

   Is the immobilizer normal?

   • Yes: Go to  3.
   • No: Repair the immobilizer. Ref. to IMMOBILIZER (DIAGNOSTICS)>Basic Diagnostic Procedure .
3. CHECK FOR MALFUNCTION OCCURRENCE  .

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

   • Yes: Go to  28.
   • 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 "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

   Is the value of [Engine Speed] 0 RPM?

   • Yes:
     • When the value of [Control module voltage] is less than 5 V: Check the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION .
     • When the value of [Control module voltage] is 5 V or more: Go to  5.
   • No:
     • When the value of [Engine Speed] is less than 250 RPM: Go to  11.
     • When the value of [Engine Speed] is 250 RPM or more: Go to  18.
5. CHECK FREEZE FRAME DATA  .

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

   NOTE:

   • For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .
   • ECM power voltage drops temporarily at cranking.

   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)>Engine Trouble in General>INSPECTION .
   • No:
     • When the value of [Control module voltage] changes in any one of freeze frame data: Go to  6.
     • When the value of [Control module voltage] does not change in all freeze frame data: Check the starter motor circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostics for Engine Starting Failure>STARTER MOTOR CIRCUIT .
6. CHECK 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)>Crankshaft Position Sensor>INSTALLATION .
7. CHECK CRANKSHAFT POSITION SENSOR  .

   Check the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor>INSPECTION .

   Is the crankshaft position sensor normal?

   • Yes: Go to  8.
   • No: Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
8. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .
   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 & terminal 

   (B135) No. 40 - (E10) No. 1:

   (B135) No. 27 - (E10) No. 2:

   Is the resistance less than 1 Ω? 

   • Yes: Go to  9.
   • No: Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
9. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .

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

   Connector & terminal 

   (E10) No. 1 - Engine ground:

   (E10) No. 2 - Engine ground:

   Is the resistance 1 MΩ or more? 

   • Yes: Go to  10.
   • No: Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
10. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
    2. Check that the fault is removed.

    Is the fault removed?

    • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    • No: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .
11. CHECK OF FUEL PUMP  .
    1. On the item [Active Test], select [Fuel Pump Control (ON/OFF Dr.)] and perform ON/OFF drive.
       NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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  13.
    • No: Go to  12.
12. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION .

    Is the fuel pump normal?

    • Yes: Check fuel pump system. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION .
    • No: Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump .
13. CHECK FUEL TANK  .

    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  14.
14. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Is the measured value 334 - 400 kPa (3.4 - 4.1 kgf/cm² , 48 - 58 psi)?

    • Yes: Go to  15.
    • No: Check the fuel pump and fuel delivery line. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Delivery and Evaporation Lines>INSPECTION .
15. CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between fuel injector connector and the engine ground.

    Connector & terminal 

    (E5) No. 2 (+) - Engine ground (-):

    (E16) No. 2 (+) - Engine ground (-):

    (E6) No. 2 (+) - Engine ground (-):

    (E17) No. 2 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes: Go to  16.
    • No: Repair the power supply circuit.
16. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Disconnect the connector from fuel injector.
    4. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector & terminal 

    #1 (B135) No. 23 - (E5) No. 1:

    #2 (B135) No. 8 - (E16) No. 1:

    #3 (B135) No. 9 - (E6) No. 1:

    #4 (B135) No. 22 - (E17) No. 1:

    Is the resistance less than 1 Ω?

    • Yes: Go to  17.
    • No: Repair the open circuit of the harness between the ECM connector and fuel injector connector.
17. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR  .

    Measure the resistance between the ECM connector and engine ground.

    Connector & terminal 

    #1 (B135) No. 23 - Engine ground:

    #2 (B135) No. 8 - Engine ground:

    #3 (B135) No. 9 - Engine ground:

    #4 (B135) No. 22 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  27.
    • No: Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
18. CHECK FREEZE FRAME DATA  .

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

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Coolant Temp.] 120°C (248°F) or more? Or is the value of [Coolant Temp.] lower than that of [Ambient air temperature] by 15°C (27°F) or more?

    • Yes: Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor .
    • No:
      • When the minimum value of [Engine Speed] is less than 300 RPM: Go to  19.
      • When the minimum value of [Engine Speed] is 300 RPM or more: It is possible that the engine compression pressure is not sufficient. Check the engine. Ref. to MECHANICAL(H4DO)>Engine Trouble in General>INSPECTION .
19. CHECK FUEL INJECTOR  .

    Check fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector>INSPECTION .

    Is there any deposit in the fuel injectors?

    • Yes: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
    • No: Go to  20.
20. CHECK FUEL TANK  .

    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  21.
21. CHECK FREEZE FRAME DATA  .

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

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

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

    • Yes: Go to  23.
    • No: Go to  22.
22. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
    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 kgf/cm² , 21 psi) or more?

    • Yes: Go to  27.
    • No: Replace the pressure regulator. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Filter .
23. 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.
    • If HC concentration gauge is not available, go to the next step.
    • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.

    Is the HC concentration less than 4, 000 ppm?

    • Yes: Go to  25.
    • No: Go to  24.
24. CHECK FUEL INJECTOR  .

    Check fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector>INSPECTION .

    Are fuel injectors OK?

    • Yes: Go to  25.
    • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
25. CHECK THROTTLE BODY  .

    Check throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Throttle Body>INSPECTION .

    Is there any deposit in the throttle body?

    • Yes: Replace the throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Throttle Body .
    • No: Go to  26.
26. 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)>General Description .
    • No: Go to  27.
27. CHECK FOR MALFUNCTION OCCURRENCE  .

    Is the fault removed?

    • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    • No: Go to  28.
28. CHECK FOR MALFUNCTION OCCURRENCE  .

    Does cranking occur?

    • Yes:
      • When the engine speed is abnormal during cranking: Go to  35.
      • When an initial combustion does not occur: Go to  38.
      • When the engine stalls immediately after engine start: Go to  56.
      • When the engine takes time to start: Go to  70.
    • No: Go to  29.
29. CHECK FOR MALFUNCTION OCCURRENCE  .

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

    • Yes:
      • When the starter motor does not rotate: Go to  30.
      • When the starter motor rotates but does not engage: Go to  32.
    • No: Go to  33.
30. CHECK BATTERY  .

    Check the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION .

    Is the battery OK?

    • Yes: Go to  31.
    • No: Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery .
31. 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)>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)>Engine Trouble in General>INSPECTION .
    • No: It is possible that the engine friction is too large. Check the engine. Ref. to MECHANICAL(H4DO)>Engine Trouble in General>INSPECTION .
32. CHECK STARTER MOTOR  .

    Check the starter motor. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Starter>INSPECTION .

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

    • Yes: Repair the starter motor. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Starter .
    • No: Replace the torque converter assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>Torque Converter Assembly .
33. CHECK BATTERY  .

    Check the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION .

    Is the battery OK?

    • Yes: Go to  34.
    • No: Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery .
34. CHECK STARTER MOTOR  .

    Check the starter motor. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Starter>INSPECTION .

    Is the starter motor OK?

    • Yes: Check the starter motor circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostics for Engine Starting Failure>STARTER MOTOR CIRCUIT .
    • No: Repair the starter motor. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Starter .
35. CHECK DATA MONITOR  .

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

    NOTE: For detailed operation procedures, refer to the "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>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)>Engine Trouble in General .
    • No: Go to  36.
36. CHECK BATTERY  .

    Check the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION .

    Is the battery OK?

    • Yes: Go to  37.
    • No: Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS(H4DO)>Battery .
37. 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)>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)>Engine Trouble in General>INSPECTION .
    • No: It is possible that the engine friction is too large. Check the engine. Ref. to MECHANICAL(H4DO)>Engine Trouble in General>INSPECTION .
38. 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  39.
    • No: Go to  52.
39. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Is the measured value 334 - 400 kPa (3.4 - 4.1 kgf/cm² , 48 - 58 psi)?

    • Yes: Go to  40.
    • No: Go to  50.
40. CHECK IGNITION CONDITION  .

    Check the ignition condition. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostics for Engine Starting Failure>IGNITION CONTROL SYSTEM .

    Is the ignition condition normal?

    • Yes: Go to  41.
    • No: Go to  44.
41. 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  43.
    • No:
      • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to  42.
      • When the fault occurrence pattern is inconsistent: Go to  83.
42. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
    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 kgf/cm² , 21 psi) or more?

    • Yes: Go to  83.
    • No: Replace the pressure regulator. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Filter .
43. 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:

    • If HC concentration gauge is not available, go to the next step.
    • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.

    Is the HC concentration less than 4, 000 ppm?

    • Yes: Go to  83.
    • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
44. CHECK SPARK PLUG  .

    Check the spark plug. Ref. to IGNITION(H4DO)>Spark Plug>INSPECTION .

    Are the spark plugs normal?

    • Yes: Go to  45.
    • No: Replace all spark plugs on all cylinders. Ref. to IGNITION(H4DO)>Spark Plug .
45. CHECK DATA MONITOR  .

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

    NOTE: For detailed operation procedures, refer to the "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>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)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT .
    • No: Go to  46.
46. 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 & 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  47.
    • No: repair the harness and connector.
      NOTE: In this case, repair the following item:

      • Open or short to ground in power supply circuit
      • Poor contact of coupling connector
      • Blown out of fuse
47. CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR  .
    1. Disconnect the connector from ECM.
    2. Measure the resistance of harness between ECM connector and ignition coil connector.

    Connector & terminal 

    (B135) No. 37 - (E31) No. 2:

    (B135) No. 35 - (E32) No. 2:

    (B135) No. 38 - (E33) No. 2:

    (B135) No. 36 - (E34) No. 2:

    Is the resistance less than 1 Ω?

    • Yes: Go to  48.
    • No: Repair the open circuit in harness between ECM connector and ignition coil connector.
48. CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR  .

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

    Connector & terminal 

    (B135) No. 37 - Engine ground:

    (B135) No. 35 - Engine ground:

    (B135) No. 38 - Engine ground:

    (B135) No. 36 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  49.
    • No: Repair the ground short circuit of harness between ECM connector and ignition coil connector.
49. CHECK HARNESS OF IGNITION COIL GROUND CIRCUIT  .
    1. Turn the ignition switch to OFF.
    2. Measure the resistance of harness between ignition coil connector and engine ground.

       Connector & 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)>Ignition Coil . If the fault occurs after servicing, continue the diagnosis. Go to  89.
    • No: Repair the open circuit in harness between ignition coil connector and engine grounding terminal.
50. CHECK OF FUEL PUMP  .
    1. On the item [Active Test], select [Fuel Pump Control (ON/OFF Dr.)] and perform ON/OFF drive.
       NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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)>Fuel Pump>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Delivery and Evaporation Lines>INSPECTION .
    • No: Go to  51.
51. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION .

    Is the fuel pump normal?

    • Yes: Check fuel pump system. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION . If the fault occurs after servicing, continue the diagnosis. Go to  83.
    • No: Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump .
52. CHECK DATA MONITOR  .

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

    NOTE: For detailed operation procedures, refer to the "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>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)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT .
    • No: Go to  53.
53. CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between fuel injector connector and the engine ground.

    Connector & terminal 

    (E5) No. 2 (+) - Engine ground (-):

    (E16) No. 2 (+) - Engine ground (-):

    (E6) No. 2 (+) - Engine ground (-):

    (E17) No. 2 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes: Go to  54.
    • No: Repair the power supply circuit.
54. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector & terminal 

    #1 (B135) No. 23 - (E5) No. 1:

    #2 (B135) No. 8 - (E16) No. 1:

    #3 (B135) No. 9 - (E6) No. 1:

    #4 (B135) No. 22 - (E17) No. 1:

    Is the resistance less than 1 Ω?

    • Yes: Go to  55.
    • No: Repair the open circuit of the harness between the ECM connector and fuel injector connector.
55. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR  .

    Measure the resistance between the ECM connector and engine ground.

    Connector & terminal 

    #1 (B135) No. 23 - Engine ground:

    #2 (B135) No. 8 - Engine ground:

    #3 (B135) No. 9 - Engine ground:

    #4 (B135) No. 22 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .
    • No: Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
56. 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)>Mass Air Flow and Intake Air Temperature Sensor>INSPECTION .

    Is the mass air flow and intake air temperature sensor normal?

    • Yes: Go to  57.
    • No: Go to  68.
57. 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)>General Description .
    • No: Go to  58.
58. CHECK THROTTLE BODY  .

    Check throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Throttle Body>INSPECTION .

    Is there any deposit in the throttle body?

    • Yes: Replace the throttle body. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Throttle Body .
    • No: Go to  59.
59. 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] and [VVT Advance Target Angle Amount L].
       NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .
    2. Using the Subaru Select Monitor, compare the values between [VVT Adv. Ang. Amount R] and [VVT Advance Target Angle Amount R], and between [VVT Adv. Ang. Amount L] and [VVT Advance Target Angle Amount L].

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

    • Yes: Go to  98.
    • No: Diagnose the part where there is difference of 10 deg or more.
      • Intake RH: Go to  60.
      • Intake LH: Go to  64.
60. 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 & terminal 

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

    Is the voltage 10 V or more?

    • Yes: Go to  61.
    • No: Repair the power supply circuit.
61. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH CONNECTOR  .
    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 & terminal 

    (B135) No. 20 - (E38) No. 2:

    Is the resistance less than 1 Ω?

    • Yes: Go to  62.
    • No: Repair the open circuit in harness between ECM connector and intake oil control solenoid RH connector.
62. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH CONNECTOR  .

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

    Connector & terminal 

    (E38) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  63.
    • No: Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid RH connector.
63. CHECK INTAKE OIL CONTROL SOLENOID RH  .

    Check the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Oil Control Solenoid>INSPECTION .

    Is the intake oil control solenoid RH normal?

    • Yes: Replace the intake cam sprocket RH. Ref. to MECHANICAL(H4DO)>Cam Sprocket .
    • No: Replace the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Oil Control Solenoid .
64. 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 & terminal 

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

    Is the voltage 10 V or more?

    • Yes: Go to  65.
    • No: Repair the power supply circuit.
65. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR  .
    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 & terminal 

    (B135) No. 6 - (E37) No. 2:

    Is the resistance less than 1 Ω?

    • Yes: Go to  66.
    • No: Repair the open circuit in harness between ECM connector and intake oil control solenoid LH connector.
66. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR  .

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

    Connector & terminal 

    (E37) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  67.
    • No: Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.
67. CHECK INTAKE OIL CONTROL SOLENOID LH  .

    Check the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Oil Control Solenoid>INSPECTION .

    Is the intake oil control solenoid LH normal?

    • Yes: Replace the intake cam sprocket LH. Ref. to MECHANICAL(H4DO)>Cam Sprocket .
    • No: Replace the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Oil Control Solenoid .
68. CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the mass air flow and intake air temperature sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector.

       Connector & terminal 

       (B134) No. 16 - (B3) No. 5:

       (B134) No. 17 - (B3) No. 4:

    Is the resistance less than 1 Ω?

    • Yes: Go to  69.
    • No: Repair the open circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
69. CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR  .

    Measure the resistance between the ECM connector and engine ground.

    Connector & terminal 

    (B134) No. 16 - Engine ground:

    (B134) No. 17 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Mass Air Flow and Intake Air Temperature Sensor . If the fault occurs after servicing, continue the diagnosis. Go to  98.
    • No: Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
70. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor>INSPECTION .

    Is the engine coolant temperature sensor normal?

    • Yes: Go to  71.
    • No: Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor . If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  109.
71. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine coolant temperature sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

    Connector & terminal 

    (B135) No. 34 - (E8) No. 1:

    (B135) No. 43 - (E8) No. 2:

    Is the resistance less than 1 Ω?

    • Yes: Go to  72.
    • 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)>Engine Control Module (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  109.
72. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR  .

    Measure the resistance between the ECM connector and engine ground.

    Connector & terminal 

    (B135) No. 43 - Engine ground:

    (B135) No. 34 - 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 engine coolant temperature sensor connector. If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  109.
73. 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 the "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    Is the value of [Long Term Fuel Trim (B1)] -25 - 25%? And is the value of [Barometric Pressure] 80 kPa (600 mmHg, 23.6 inHg) or more?

    • Yes: Go to  76.
    • No: Go to  74.
74. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Clear the memory. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    2. Start the engine.

    Does the engine start?

    • Yes: Go to  75.
    • No: Go to  76.
75. 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)>Mass Air Flow and Intake Air Temperature Sensor . If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  109.
    • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector . If the fault occurs after servicing, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to  109.
76. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Is the measured value 334 - 400 kPa (3.4 - 4.1 kgf/cm² , 48 - 58 psi)?

    • Yes: Go to  77.
    • No: Go to  82.
77. CHECK SPARK PLUG  .

    Check the spark plug. Ref. to IGNITION(H4DO)>Spark Plug>INSPECTION .

    Are all spark plug in all cylinders normal?

    • Yes: Go to  78.
    • 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)>Spark Plug . If the fault occurs after servicing, continue the diagnosis. Go to  109.
      • When all spark plugs in all cylinders are faulty: Replace faulty spark plugs in all cylinders. Ref. to IGNITION(H4DO)>Spark Plug . If the fault occurs after servicing, continue the diagnosis. Go to  109.
78. 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  80.
    • No:
      • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to  79.
      • When the fault occurrence pattern is inconsistent: Go to  109.
79. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
    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 kgf/cm² , 21 psi) or more?

    • Yes: Go to  108.
    • No: Replace the pressure regulator. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Filter .
80. CHECK PURGE CONTROL SOLENOID VALVE  .

    Check the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>Purge Control Solenoid Valve>INSPECTION .

    Is the purge control solenoid valve OK?

    • Yes: Go to  81.
    • No: Replace the faulty purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>Purge Control Solenoid Valve .
81. 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:

       • If HC concentration gauge is not available, go to the next step.
       • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.

    Is the HC concentration less than 4, 000 ppm?

    • Yes: Go to  109.
    • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
82. CHECK OF FUEL PUMP  .

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION .

    Is the fuel pump normal?

    • Yes: Check fuel pump system. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION . If the fault occurs after servicing, continue the diagnosis. Go to  109.
    • No: Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump .
83. CHECK FUEL INJECTOR  .

    Check fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector>INSPECTION .

    Are fuel injectors OK?

    • Yes: Go to  84.
    • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
84. CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between fuel injector connector and the engine ground.

    Connector & terminal 

    (E5) No. 2 (+) - Engine ground (-):

    (E16) No. 2 (+) - Engine ground (-):

    (E6) No. 2 (+) - Engine ground (-):

    (E17) No. 2 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes: Go to  85.
    • No: Repair the power supply circuit.
85. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector & terminal 

    #1 (B135) No. 23 - (E5) No. 1:

    #2 (B135) No. 8 - (E16) No. 1:

    #3 (B135) No. 9 - (E6) No. 1:

    #4 (B135) No. 22 - (E17) No. 1:

    Is the resistance less than 1 Ω?

    • Yes: Go to  86.
    • No: Repair the open circuit of the harness between the ECM connector and fuel injector connector.
86. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR  .

    Measure the resistance between the ECM connector and engine ground.

    Connector & terminal 

    #1 (B135) No. 23 - Engine ground:

    #2 (B135) No. 8 - Engine ground:

    #3 (B135) No. 9 - Engine ground:

    #4 (B135) No. 22 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  87.
    • No: Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
87. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
    2. Check that the fault is removed.

    Is the fault removed?

    • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    • No: Go to  88.
88. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the camshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Camshaft Position Sensor .
    2. Check that the fault is removed.

    Is the fault removed?

    • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    • No: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .
89. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

    Is the crankshaft position sensor installed correctly?

    • Yes: Go to  90.
    • No: Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor>INSTALLATION .
90. CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR  .

    Is the camshaft position sensor installed correctly?

    • Yes: Go to  91.
    • No: Install the camshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Camshaft Position Sensor>INSTALLATION .
91. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .
    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 & terminal 

    (B135) No. 40 - (E10) No. 1:

    (B135) No. 27 - (E10) No. 2:

    Is the resistance less than 1 Ω?

    • Yes: Go to  92.
    • No: Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
92. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .

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

    Connector & terminal 

    (E10) No. 1 - Engine ground:

    (E10) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  93.
    • No: Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
93. 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 & terminal 

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

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

    Is the voltage 10 V or more?

    • Yes: Go to  94.
    • 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
94. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR  .
    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 & terminal 

    (B135) No. 41 - (E35) No. 2:

    (B135) No. 42 - (E35) No. 3:

    (B135) No. 54 - (E36) No. 2:

    (B135) No. 42 - (E36) No. 3:

    Is the resistance less than 1 Ω?

    • Yes: Go to  95.
    • No: Repair the open circuit in the harness between ECM connector and intake camshaft position sensor connector.
95. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR  .

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

    Connector & terminal 

    (E35) No. 2 - Engine ground:

    (E36) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes: Go to  96.
    • No: Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.
96. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
    2. Check that the fault is removed.

    Is the fault removed?

    • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    • No: Go to  97.
97. CHECK FOR MALFUNCTION OCCURRENCE  .
    1. Replace the camshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Camshaft Position Sensor .
    2. Check that the fault is removed.

    Is the fault removed?

    • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    • No: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .
98. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor>INSPECTION .

    Is the engine coolant temperature sensor normal?

    • Yes: Go to  99.
    • No: Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor .
99. CHECK FUEL PRESSURE  .
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

    CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

    Is the measured value 334 - 400 kPa (3.4 - 4.1 kgf/cm² , 48 - 58 psi)?

    • Yes: Go to  100.
    • No: Go to  117.
100. CHECK FUEL PRESSURE  .
     WARNING: Place "NO OPEN FLAMES" signs near the working area.
     CAUTION: Be careful not to spill fuel.

     Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

     CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
     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 kgf/cm² , 21 psi) or more?

     • Yes: Go to  101.
     • No: Go to  117.
101. 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 the Data Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>DATA MONITOR .

     Does the value of [Long Term Fuel Trim (B1)] fall within a range of -15 - 15%?

     • Yes: Go to  102.
     • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
102. 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  103.
103. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

     Is the crankshaft position sensor installed correctly?

     • Yes: Go to  104.
     • No: Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor>INSTALLATION .
104. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .
     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 & terminal 

     (B135) No. 40 - (E10) No. 1:

     (B135) No. 27 - (E10) No. 2:

     Is the resistance less than 1 Ω?

     • Yes: Go to  105.
     • No: Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
105. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .

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

     Connector & terminal 

     (E10) No. 1 - Engine ground:

     (E10) No. 2 - Engine ground:

     Is the resistance 1 MΩ or more?

     • Yes: Go to  106.
     • No: Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
106. CHECK COMPRESSION PRESSURE  .

     Check the compression pressure. Ref. to MECHANICAL(H4DO)>Compression>INSPECTION .

     Is the compression pressure normal?

     • Yes: Go to  107.
     • No: Check the engine. Ref. to MECHANICAL(H4DO)>Engine Trouble in General>INSPECTION .
107. CHECK FOR MALFUNCTION OCCURRENCE  .
     1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
     2. Check that the fault is removed.

     Is the fault removed?

     • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
     • No: Check the valve timing. Ref. to MECHANICAL(H4DO)>Timing Chain Assembly . When the valve timing is normal, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .
108. CHECK OF FUEL PUMP  .

     Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION .

     Is the fuel pump normal?

     • Yes: Check fuel pump circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostics for Engine Starting Failure>FUEL PUMP CIRCUIT .
     • No: Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump .
109. CHECK FUEL PRESSURE  .
     WARNING: Place "NO OPEN FLAMES" signs near the working area.
     CAUTION: Be careful not to spill fuel.

     Measure the fuel pressure. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

     CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.

     Is the measured value 334 - 400 kPa (3.4 - 4.1 kgf/cm² , 48 - 58 psi)?

     • Yes: Go to  110.
     • No: Go to  117.
110. CHECK FUEL PRESSURE  .
     WARNING: Place "NO OPEN FLAMES" signs near the working area.
     CAUTION: Be careful not to spill fuel.

     Measure the fuel pressure five minutes after the engine is stopped. Ref. to MECHANICAL(H4DO)>Fuel Pressure>INSPECTION .

     CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
     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 kgf/cm² , 21 psi) or more?

     • Yes: Go to  111.
     • No: Go to  117.
111. 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-Bank1].
     NOTE: For detailed operation procedures, refer to the Data Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>DATA MONITOR .

     Does the value of [Long Term Fuel Trim-Bank1] fall within a range of -15 - 15%?

     • Yes: Go to  112.
     • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
112. 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  113.
113. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

     Is the crankshaft position sensor installed correctly?

     • Yes: Go to  114.
     • No: Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor>INSTALLATION .
114. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .
     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 & terminal 

     (B135) No. 40 - (E10) No. 1:

     (B135) No. 27 - (E10) No. 2:

     Is the resistance less than 1 Ω?

     • Yes: Go to  115.
     • No: Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
115. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .

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

     Connector & terminal 

     (E10) No. 1 - Engine ground:

     (E10) No. 2 - Engine ground:

     Is the resistance 1 MΩ or more?

     • Yes: Go to  116.
     • No: Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
116. CHECK FOR MALFUNCTION OCCURRENCE  .
     1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
     2. Check that the fault is removed.

     Is the fault removed?

     • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
     • No: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .
117. CHECK OF FUEL PUMP  .

     Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump>INSPECTION .

     Is the fuel pump normal?

     • Yes: Go to  118.
     • No: Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pump .
118. CHECK FUEL PUMP SYSTEM  .

     Check fuel pump circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostics for Engine Starting Failure>FUEL PUMP CIRCUIT .

     Is the fuel pump system normal?

     • Yes: Go to  119.
     • No: Repair the fuel pump circuit. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Diagnostics for Engine Starting Failure>FUEL PUMP CIRCUIT .
119. CHECK PURGE CONTROL SOLENOID VALVE  .

     Check the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>Purge Control Solenoid Valve>INSPECTION .

     Is the purge control solenoid valve OK?

     • Yes: Go to  120.
     • No: Replace the faulty purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO)>Purge Control Solenoid Valve .
120. 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:

     • If HC concentration gauge is not available, go to the next step.
     • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.

     Is the HC concentration less than 4, 000 ppm?

     • Yes: Go to  121.
     • No: Replace the fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector .
121. CHECK INTAKE VALVE  .

     Check the intake valve. Ref. to MECHANICAL(H4DO)>Cylinder Head>INSPECTION .

     Is there any deposit in the intake valve?

     • Yes: Clean the intake valve. Ref. to MECHANICAL(H4DO)>Cylinder Head .
     • No: Go to  122.
122. CHECK ENGINE COOLANT TEMPERATURE SENSOR  .

     Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor>INSPECTION .

     Is the engine coolant temperature sensor normal?

     • Yes: Go to  123.
     • No: Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Coolant Temperature Sensor .
123. CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR  .

     Is the crankshaft position sensor installed correctly?

     • Yes: Go to  124.
     • No: Install the crankshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor>INSTALLATION .
124. CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR  .

     Is the camshaft position sensor installed correctly?

     • Yes: Go to  125.
     • No: Install the camshaft position sensor correctly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Camshaft Position Sensor>INSTALLATION .
125. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .
     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 & terminal 

     (B135) No. 40 - (E10) No. 1:

     (B135) No. 27 - (E10) No. 2:

     Is the resistance less than 1 Ω?

     • Yes: Go to  126.
     • No: Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
126. CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR  .

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

     Connector & terminal 

     (E10) No. 1 - Engine ground:

     (E10) No. 2 - Engine ground:

     Is the resistance 1 MΩ or more?

     • Yes: Go to  127.
     • No: Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
127. 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 & terminal 

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

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

     Is the voltage 10 V or more? 

     • Yes: Go to  128.
     • 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
128. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR  .
     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 & terminal 

        (B135) No. 41 - (E35) No. 2:

        (B135) No. 42 - (E35) No. 3:

        (B135) No. 54 - (E36) No. 2:

        (B135) No. 42 - (E36) No. 3:

     Is the resistance less than 1 Ω?

     • Yes: Go to  129.
     • No: Repair the open circuit in the harness between ECM connector and intake camshaft position sensor connector.
129. CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR  .

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

     Connector & terminal 

     (E35) No. 2 - Engine ground:

     (E36) No. 2 - Engine ground:

     Is the resistance 1 MΩ or more?

     • Yes: Go to  130.
     • No: Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.
130. CHECK COMPRESSION PRESSURE  .

     Check the compression pressure. Ref. to MECHANICAL(H4DO)>Compression>INSPECTION .

     Is the compression pressure normal?

     • Yes: Go to  131.
     • No: Check the engine. Ref. to MECHANICAL(H4DO)>Engine Trouble in General>INSPECTION .
131. CHECK FOR MALFUNCTION OCCURRENCE  .
     1. Replace the crankshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Crankshaft Position Sensor .
     2. Check that the fault is removed.

     Is the fault removed?

     • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
     • No: Go to  132.
132. CHECK FOR MALFUNCTION OCCURRENCE  .
     1. Replace the camshaft position sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Camshaft Position Sensor .
     2. Check that the fault is removed.

     Is the fault removed?

     • Yes: Clear the memory to complete. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
     • No: Check the valve timing. Ref. to MECHANICAL(H4DO)>Timing Chain Assembly . When the valve timing is normal, replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM) .