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Home >> Nissan-Datsun >> 2009 >> Murano LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction >> Component Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. INSPECTION START

    Start engine.

    Is engine running? 

    YES: GO TO  8.

    NO: GO TO 2.

  2. CHECK ECM POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF and then ON.
    2. Check the voltage between ECM harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      ECM Ground Voltage
      Connector Terminal
      E16 93 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R connector E10
    • 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.

  4. CHECK GROUND CONNECTION-I
    1. Turn ignition switch OFF.
    2. Check ground connection E38. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace ground connection.

  5. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.
      TERMINAL CONTINUITY REFERENCE

      ECM Ground Continuity
      Connector Terminal
      F7 12 Ground Existed
      16
      E16 107
      108
      111
      112
    3. Also check harness for short to power.

      is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F121, E7
    • Harness for open or short between ECM and ground

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

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

      IPDM E/R Ground Voltage
      Connector Terminal
      F12 49 Ground Battery voltage

      Is the inspection result normal? 

      YES: Refer to "DIAGNOSIS PROCEDURE ".

      NO: GO TO 8.

  8. 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 and ground.
      TERMINALS VOLTAGE REFERENCE

      ECM Ground Voltage
      Connector Terminal
      E16 105 Ground 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  13.

      NO-1: Battery voltage does not exist: GO TO 9.

      NO-2: Battery voltage exists for more than a few seconds: GO TO  10.

  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 and ground.
      TERMINALS VOLTAGE REFERENCE

      ECM Ground Voltage
      Connector Terminal
      F7 24 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: GO TO  11.

  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.
      TERMINAL CONTINUITY REFERENCE

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E16 105 E10 10 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  16.

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

  11. 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.
      TERMINAL CONTINUITY REFERENCE

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F7 24 F12 69 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 12.

      NO: 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  16.

      NO: Replace 15A fuse.

  13. CHECK GROUND CONNECTION-II

    Check ground connection E38. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Repair or replace ground connection.

  14. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.
      TERMINAL CONTINUITY REFERENCE

      ECM Ground Continuity
      Connector Terminal
      F7 12 Ground Existed
      16
      E16 107
      108
      111
      112
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO  16.

      NO: GO TO 15.

  15. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness or connectors F121, E7
    • Harness for open or short between ECM and ground

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

  16. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

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

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