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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan 350Z. 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-II or tester.
      • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  4.
    • NG: GO TO 3.
    Fig 1: ECM Connector Terminal 109 & Ground Voltage Test
    G02401340Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M72, F102
    • Fuse block (J/B) connector M4
    • 10A fuse
    • Harness for open or short between ECM and fuse
      • : Repair open circuit or short to ground or short to power in 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: Retightening Three Ground Screws
      G02401341Courtesy of NISSAN MOTOR CO., U.S.A.

    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 F103, F151
    • Harness connectors F3, E12
    • 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 disconnected.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R terminal 17 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG

    Fig 3: IPDM E/R Terminal 17 & Ground Voltage Test
    G02401342Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK ECM POWER SUPPLY CIRCUIT-III 
    1. Stop engine 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-II or tester.
      • Voltage: After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop approximately 0V. 

    OK or NG

    • OK: GO TO  15.
    • NG (Battery voltage does not exist.):GO TO 9.
    • NG (Battery voltage exists for more than a few seconds.):GO TO  12.
    Fig 4: ECM Terminals 119, 120 & Ground Voltage Test
    G02401343Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK ECM POWER SUPPLY CIRCUIT-IV 

    Check voltage between ECM terminal 111 and ground with CONSULT-II or tester.

    • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO 10.
    • NG: GO TO  12.
    Fig 5: ECM Terminal 111 & Ground Voltage Test
    G02401344Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK ECM POWER SUPPLY CIRCUIT-V 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E7.
    3. Check harness continuity between ECM terminals 119, 120 and IPDM E/R terminal 18. 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  18.
    • NG: GO TO 11.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E12, F3
    • Harness for open or short between ECM and IPDM E/R
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  12. CHECK ECM POWER SUPPLY CIRCUIT-VI 
    1. Disconnect IPDM E/R harness connector E9.
    2. Check harness continuity between ECM terminal 111 and IPDM E/R terminal 46. Refer to WIRING DIAGRAM .
      • Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  14.
    • NG: GO TO 13.
  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E108, M15
    • Harness or connectors M72, F102
    • Harness for open or short between ECM and IPDM E/R
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  14. CHECK 15A FUSE 
    1. Disconnect 15A fuse from IPDM E/R.
    2. Check 15A fuse.

    OK or NG

    • OK: GO TO  18.
    • NG: Replace 15A fuse.
  15. CHECK GROUND CONNECTIONS 

    Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".

    Fig 6: Loosening & Retighten Three Ground Screws On Body
    G02401345Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 16.
    • NG: Repair or replace ground connections.
  16. 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  18.
    • NG: GO TO 17.
  17. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors F103, F151
    • Harness or connectors F3, E12
    • Harness for open or short between ECM and ground.
      • : Repair open circuit or short to power in harness or connectors.
  18. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG

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