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Home › Nissan-Datsun › 2013 › Juke SL, 4WD › 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.

    Location Fuse No. Capacity
    IPDM E/R #43 20 A
    #62 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 E21 and 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.
      + - Continuity
      ECM
      Connector Terminal
      F25 1 Ground Existed
      2
      E18 123
      124
      127

      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.
      ECM Voltage
      Connector + -
      Terminal
      E18 121 127 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.
      ECM Condition Voltage (Approx.)
      Connector + -
      Terminal
      E18 121 127 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.
      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      E18 121 E14 35 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.

    ECM Condition Voltage (Approx.)
    Connector + -
    Terminal
    E18 112 127 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.
      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      E18 112 E14 41 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.
      ECM Condition Voltage (Approx.)
      Connector + -
      Terminal
      E18 109 127 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.
      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      E18 109 E15 62 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.

    ECM Voltage
    Connector + -
    Terminal
    E18 106 127 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.
      + - Continuity
      ECM IPDM E/R
      Connector Terminal Connector Terminal
      E18 106 E14 42 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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