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Home >> Nissan-Datsun >> 2009 >> 350Z Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction >> Service Information >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  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 53 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      OK or NG 

      OK: GO TO  4.

      NG: GO TO 3.

      Fig 1: Checking Voltage Between ECM Terminal 53 And Ground
      G04874903Courtesy 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

    Models with VDC system, navigation system or telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Identifying Ground Points
      G06054734Courtesy of NISSAN MOTOR CO., U.S.A.

    Models without VDC system, navigation system and telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 3: Identifying Ground Points
      G06054735Courtesy 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 8, 123, 124, 127, 128 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 M72, F102
    • Harness connectors F103, B113 (Models with VDC system, navigation system or telephone) or F151 (Models without VDC system, navigation system and telephone)
    • 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-III or tester.

      Voltage: Battery voltage 

      OK or NG 

      OK: Go to IGNITION SIGNAL .

      NG: GO TO 8.

      Fig 4: Checking Voltage Between IPDM E/R Terminal 17 And Ground
      G04874906Courtesy of NISSAN MOTOR CO., U.S.A.
  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 125 and ground with CONSULT-III 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 5: Checking Voltage Between ECM Terminals 125 And Ground
      G04874907Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK ECM POWER SUPPLY CIRCUIT-IV

    Check voltage between ECM terminal 24 and ground with CONSULT-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 10.

    NG: GO TO  12.

    Fig 6: Checking Voltage Between ECM Terminal 24 And Ground
    G04874908Courtesy 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 125 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 E108, M15
    • 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 24 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 E10, F1
    • 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

    Models with VDC system, navigation system or telephone 

    1. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 7: Identifying Ground Points
      G06054739Courtesy of NISSAN MOTOR CO., U.S.A.

    Models without VDC system, navigation system and telephone 

    1. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 8: Identifying Ground Points
      G06054740Courtesy 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 8, 123, 124, 127, 128 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 connectors F103, B113 (Models with VDC system, navigation system or telephone) or F151 (Models without VDC system, navigation system and telephone)
    • Harness or connectors F3, E12
    • Harness or connectors M72, F102
    • 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 

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

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

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