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Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. 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  8.

    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 ECM Power Supply Circuit-I Voltage
      G08693891Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  4.

      NG: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • 10 A fuse (No. 59)
    • Harness for open or short between ECM and fuse

      :Repair harness or connectors.

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

      Refer to "GROUND INSPECTION ".

      Fig 2: Identifying Body Ground Screws
      G08693892Courtesy 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 1, 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  7.

      NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F32, E2
    • Harness for open or short between ECM and ground

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

  7. CHECK ECM POWER SUPPLY CIRCUIT-II 
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R terminal 4 and ground with CONSULT or tester.

      Voltage: Battery voltage 

      Fig 3: Checking ECM Power Supply Circuit-II Voltage
      G08693893Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: Go to COMPONENT INSPECTION .

      NG: GO TO 8.

  8. 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 approximately 0 V. 

      Fig 4: Checking ECM Power Supply Circuit-III Voltage
      G08693894Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  13.

      NG (Battery voltage does not exist.): GO TO 9.

      NG (Battery voltage exists for more than a few seconds.): GO TO  11.

  9. 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 ECM Power Supply Circuit-IV Voltage
      G08693895Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 10.

      NG: GO TO  11.

  10. 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 3.

      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  13.

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

  11. 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 12.

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

  12. CHECK 20A FUSE 
    1. Disconnect 20 A fuse from IPDM E/R.
    2. Check 20 A fuse (No. 53).

      OK or NG 

      OK: GO TO  16.

      NG: Replace 20 A fuse.

  13. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 6: Identifying Body Ground Screws
      G08693896Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 14.

      NG: Repair or replace ground connections.

  14. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 1, 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  16.

      NG: GO TO 15.

  15. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F32, E2
    • Harness for open or short between ECM and ground

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

  16. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    OK or NG 

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

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

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