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Home >> Infiniti >> 2008 >> EX35 Base, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Introduction >> Component Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION-I
    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-I
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.
      CONTINUITY SPECIFICATIONS

      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 SPECIFICATIONS

      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
    • 10A fuse (No. 44)
    • Harness for open or short between ECM and fuse

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

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

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

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: GO TO  9.

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

      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 "CIRCUIT INSPECTION ".

    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 SPECIFICATIONS

      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-VI
    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 SPECIFICATIONS

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

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

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

    Is the inspection result normal? 

    YES: GO TO  15.

    NO: Replace 15A 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 SPECIFICATIONS

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

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

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