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Home >> Nissan-Datsun >> 2012 >> Murano SL, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction (Except CROSSCABRIOLET) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    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 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.
      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  4.

    NO: GO TO 3.

  3. 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.

  4. CHECK ECM POWER SUPPLY CIRCUIT-I
    1. Reconnect ECM harness connector.
    2. Turn ignition switch OFF and then ON.
    3. Check the voltage between ECM harness connector terminals.
    ECM Voltage
    Connector + -
    Terminal Terminal
    E16 93 112 Battery voltage

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R connector E10
    • 10 A fuse (No. 44)
    • 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.

  6. CHECK ECM POWER SUPPLY CIRCUIT-II

    Check the voltage between ECM harness connector terminals.

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    E16 105 112 Ignition switch ON → OFF 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.
    IPDM E/R Ground Voltage
    Connector Terminal
    F12 49 Ground Battery voltage
    53

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace IPDM E/R. Refer to "EXPLODED VIEW ".

  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.
    ECM Voltage
    + -
    Connector Terminal Connector Terminal
    F7 24 E16 112 Battery voltage

    Is the inspection result normal? 

    YES: GO TO  12.

    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.
      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 11.

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

  11. 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  13.

    NO: Replace 15 A fuse.

  12. 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.
      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 13.

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

  13. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "EXPLODED VIEW ".

    NO: Repair or replace harness or connectors.

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