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Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connections M16, M70. Refer to "GROUND INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connections.

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

      ECM Ground Continuity
      Connector Terminal
      F105 8 Ground Existed
      M9 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 F102, M72
    • 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.
      CONNECTOR TERMINAL VOLTAGE CHART

      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F106 53 M9 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

      Fig 1: Checking Voltage Between ECM Harness Connector Terminals
      G06306443Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M72, F102
    • Fuse block (J/B) connector M4
    • 15 A fuse (No. 1)
    • 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 per the following.
      CONNECTOR TERMINAL VOLTAGE CHART

      ECM Voltage
      Connector + -
      Terminal Terminal
      M9 125 128 After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.
      Fig 2: Checking Voltage Between ECM Harness Connector Terminals
      G06306444Courtesy of NISSAN MOTOR CO., U.S.A.

      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.
      CONNECTOR TERMINAL VOLTAGE CHART

      IPDM E/R Ground Voltage
      Connector Terminal
      E7 17 Ground Battery voltage
      Fig 3: Checking Voltage Between IPDM E/R Harness Connector And Ground
      G04874906Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Replace IPDM E/R.

  8. CHECK INTERMITTENT INCIDENT

    Refer to "DESCRIPTION ".

    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 per the following.
      CONNECTOR TERMINAL VOLTAGE CHART

      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F105 24 M9 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 10.

      Fig 4: Checking Voltage Between ECM Harness Connector Terminals
      G06306446Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
      CONNECTOR TERMINAL CONTINUITY CHART

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F105 24 E9 46 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 E11, F2
    • 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 20 A FUSE
    1. Disconnect 20 A fuse (No. 77) from IPDM E/R.
    2. Check 20 A fuse.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: Replace 20 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.
      CONNECTOR TERMINAL CONTINUITY CHART

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      M9 125 E7 18 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 E108, M15
    • 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 "DESCRIPTION ".

    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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