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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (1 Of 3)) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK FUSE

    Check that there is no blowout in the following fuses.

    Location Fuse No. Capacity
    IPDM E/R #44 15 A
    #56 10 A

    Is the fuse blown (open)?

    YES 

    If the replaced fuse is blown again. Check IPDM E/R power supply.

    NO 

    GO TO STEP 2  .

  2. CHECK GROUND CONNECTION

    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to CIRCUIT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 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
      E32 147 Ground Existed
      149
      152
      F78 10
      58
      F79 105
      110

    Is the inspection result normal?

    YES 

    GO TO STEP 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
      E32 145 152 Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    GO TO STEP 5  .

  5. 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
      E32 145 F19 59 Existed
    5. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    Perform the trouble diagnosis for IPDM E/R power supply circuit.

    NO 

    Repair or replace error-detected parts.

  6. 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
      E32 145 152 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 STEP 9  .

    NO 

    GO TO STEP 7  .

  7. CHECK ECM RELAY CONTROL SIGNAL

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

    ECM Condition Voltage
    (Approx.)
    + -
    Connector Terminal Connector Terminal
    F79 86 E32 152 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 STEP 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
      F79 86 F24 72 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
      E32 133 152 Ignition switch OFF 0 V
      Ignition switch ON Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    GO TO STEP 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
      E32 133 E119 21 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 Connector Terminal
    F79 116 E32 152 Battery voltage

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    GO TO STEP 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
      F79 116 F19 58 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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