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Home >> Infiniti >> 2010 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ35HR) - Introduction, DTC Index, Function & Component Diagnosis >> Component Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in CIRCUIT INSPECTION .

      Is the inspection result normal? 

      YES: GO TO  2.

      NO: Repair or replace ground connection.

  2. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.
      CONTINUITY CONDITIONS

      ECM Ground Continuity
      Connector Terminal
      F101 8 Ground Existed
      M107 123
      124
      127
      128
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO  3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F103, M116
    • Harness for open or short between ECM and ground

      Repair open circuit or short to power in harness or connectors.

  4. CHECK ECM POWER SUPPLY CIRCUIT-I 
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECM harness connector and ground.
      VOLTAGE REFERENCE TABLE

      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F102 53 M107 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO  5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E3, F1
    • IPDM E/R harness connector E7
    • 10 A fuse (No. 44)
    • Harness for open or short between ECM and fuse

      Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK ECM POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connector terminals as follows.
      VOLTAGE REFERENCE TABLE

      ECM Voltage
      Connector + -
      Terminal Terminal
      M107 125 128 After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO  9.

  7. CHECK ECM POWER SUPPLY CIRCUIT-III 
    1. Turn ignition switch ON.
    2. Check the voltage between IPDM E/R harness connector and ground.
      VOLTAGE REFERENCE TABLE

      IPDM E/R Ground Voltage
      Connector Terminal
      E7 53 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: Replace IPDM E/R.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

  9. CHECK ECM POWER SUPPLY CIRCUIT-IV 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connector terminals as follows.
      VOLTAGE REFERENCE TABLE

      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F101 24 M107 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO  10.

  10. CHECK ECM POWER SUPPLY CIRCUIT-V 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      CONTINUITY CONDITIONS

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F101 24 E7 69 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: GO TO  11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E3, F1
    • Harness connectors F104, F105
    • Harness for open or short between ECM and IPDM E/R

      Repair open circuit, short to ground or short to power in harness or connectors.

  12. CHECK 15 A FUSE 
    1. Disconnect 15 A fuse (No. 50) from IPDM E/R.
    2. Check 15 A fuse.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: Replace 15 A fuse.

  13. CHECK ECM POWER SUPPLY CIRCUIT-V 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      CONTINUITY CONDITIONS

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      M107 125 E7 49 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: GO TO  14.

  14. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E106, M6
    • Harness for open or short between ECM and IPDM E/R

      Repair open circuit, short to ground or short to power in harness or connectors.

  15. CHECK INTERMITTENT INCIDENT 

    Refer to INTERMITTENT INCIDENT .

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

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