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Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START

    Start engine.

    Is engine running? 

    Yes or No 

    Yes: GO TO  7.

    No: GO TO 2.

  2. CHECK ECM POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF and then ON.
    2. Check voltage between ECM terminal 109 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    Fig 1: Checking Voltage Between ECM Terminal 109 And Ground Using Tester
    G08164872Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E152, M31
    • Fuse block harness connector M4
    • 10A fuse (No. 1)
    • Harness for open or short between ECM and fuse block

    Repair harness or connectors.

  4. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 2: Checking Ground Connections
    G08164873Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace ground connections.

  5. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 115, 116 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    3. Also check harness for short to power.

    OK or NG 

    OK: GO TO 6.

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

  6. CHECK ECM POWER SUPPLY CIRCUIT-II
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R terminal 3 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    Fig 3: Checking Voltage Between IPDM E/R Connector E119 Terminal 3 And Ground Using Tester
    G08164874Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: Go to "DIAGNOSIS PROCEDURE ".

    NG: GO TO 7.

  7. CHECK ECM POWER SUPPLY CIRCUIT-III
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON and then OFF.
    3. Check voltage between ECM terminals 119, 120 and ground with CONSULT or tester.

    Voltage: After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V  .

    Fig 4: Checking Voltage Between ECM Terminals 119, 120 And Ground Using Tester
    G08164875Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  12.

    NG (Battery voltage does not exist.)>>GO TO 8.

    NG (Battery voltage exists for more than a few seconds.)>>GO TO  10.

  8. CHECK ECM POWER SUPPLY CIRCUIT-IV
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check voltage between ECM terminal 111 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    Fig 5: Checking Voltage Between ECM Terminal 111 And Ground Using Tester
    G08164876Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 9.

    NG: GO TO  10.

  9. CHECK ECM POWER SUPPLY CIRCUIT-V
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E119.
    3. Check harness continuity between ECM terminals 119, 120 and IPDM E/R terminal 4.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  12.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  10. CHECK ECM POWER SUPPLY CIRCUIT-VI
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E119.
    3. Check harness continuity between ECM terminal 111 and IPDM E/R terminal 7.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 11.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  11. CHECK FUSE

    Check 20 A fuse (No. 53).

    OK or NG 

    OK: GO TO  14.

    NG: Replace 20 A fuse.

  12. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 6: Checking Ground Connections
    G08164877Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 13.

    NG: Repair or replace ground connections.

  13. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 115, 116 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    3. Also check harness for short to power.

    OK or NG 

    OK: GO TO 14.

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

  14. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace IPDM E/R. Refer to UNIT REMOVAL AND INSTALLATION .

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

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