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Home >> Nissan-Datsun >> 2011 >> Quest LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    Check that the following fuse is not fusing.

    FUSE REFERENCE CHART

    Location Fuse No. Capacity
    IPDM E/R #44 10 A
    #50 15 A

    Is the fuse fusing? 

    YES: Replace the fuse after repairing the applicable circuit.

    NO: GO TO 2.

  2. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E38. Refer to "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace ground connection.

  3. CHECK ECM GROUND CIRCUIT
    1. Disconnect ECM harness connectors.
    2. Check the continuity between ECM harness connector and ground.
      TERMINAL CONTINUITY REFERENCE CHART

      + - Continuity
      ECM
      Connector Terminal
      F7 16 Ground Existed
      12
      E16 123
      124
      127
      128

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair or replace error-detected parts.

  4. CHECK ECM POWER SUPPLY (MAIN)-I
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECM harness connector terminals.
      TERMINAL VOLTAGE REFERENCE CHART

      ECM Voltage
      Connector + -
      Terminal
      E16 121 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: GO TO  6.

  5. CHECK ECM POWER SUPPLY (MAIN)-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.
      TERMINAL VOLTAGE REFERENCE CHART

      ECM Condition Voltage (Approx.)
      Connector + -
      Terminal
      E16 121 128 After turning ignition switch OFF, battery voltage will exist for a few seconds Drop to 0 V

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO  7.

  6. CHECK ECM POWER SUPPLY (MAIN) CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connectors.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      E16 121 E10 10 Existed
    5. Also check harness for short to ground.

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit.

      NO: Repair or replace error-detected parts.

  7. CHECK ECM RELAY CONTROL SIGNAL

    Check the voltage between ECM harness connector terminals as per the following.

    TERMINAL VOLTAGE REFERENCE CHART

    ECM Condition Voltage (Approx.)
    + -
    Connector Terminal Connector Terminal
    F7 31 E16 128 Ignition switch ON 0 V
    Turn ignition switch OFF and wait at least 10 seconds. Battery voltage

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: GO TO 8.

  8. CHECK ECM RELAY CONTROL SIGNAL CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      F7 31 F12 69 Existed
    5. Also check harness for short to ground and to power.

      Is the inspection result normal? 

      YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair or replace error-detected parts.

  9. CHECK IGNITION SWITCH SIGNAL
    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals.
      TERMINAL VOLTAGE REFERENCE CHART

      ECM Condition Voltage (Approx.)
      Connector + -
      Terminal
      E16 109 128 Ignition switch OFF 0 V
      Ignition switch ON Battery voltage

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. CHECK IGNITION SWITCH SIGNAL CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      E16 109 E10 19 Existed
    5. Also check harness for short to ground and to power.

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit.

      NO: Repair or replace error-detected parts.

  11. CHECK ECM POWER SUPPLY (BACK-UP)

    Check the voltage between ECM harness connector terminals.

    TERMINAL VOLTAGE REFERENCE CHART

    ECM Voltage
    + -
    Connector Terminal Connector Terminal
    F7 26 E16 128 Battery voltage

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: GO TO 12.

  12. CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      F7 26 F12 55 Existed
    5. Also check harness for short to ground.

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit.

      NO: Repair or replace error-detected parts.

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