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Home >> Nissan-Datsun >> 2008 >> Maxima SL >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Introduction >> Power Supply And Ground Circuit >> Diagnostic Procedure
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Diagnostic Procedure

  1. INSPECTION START 

    Start engine.

    Is engine running? 

    Yes or No 

    OK: 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-III or tester.

      Voltage: Battery voltage 

    Fig 1: Checking Voltage Between ECM Terminal 109 And Ground
    G04875311Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  4.

    NG: GO TO  3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M4
    • 10A fuse
    • 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 four ground screws on the body.

      Refer to "GROUND INSPECTION ."

      Fig 2: Identifying Body Grounds
      G04915248Courtesy 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 F58, M70
    • 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 17 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    Fig 3: Checking Voltage Between IPDM E/R Terminal 17 And Ground
    G04874906Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO "IGNITION SIGNAL ."

    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-III or tester.

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

    Fig 4: Checking Voltage Between ECM Terminals 119, 120 And Ground
    G04900131Courtesy of NISSAN MOTOR CO., U.S.A.

    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.

  9. CHECK ECM POWER SUPPLY CIRCUIT-V 

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

    Voltage: Battery voltage 

    Fig 5: Checking Voltage Between ECM Terminal 111 And Ground
    G04900132Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  10.

    NG: GO TO  12.

  10. CHECK ECM POWER SUPPLY CIRCUIT-VI 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E122.
    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  15.

    NG: GO TO  11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E131, M92
    • 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-VII 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E121.
    3. Check harness continuity between ECM terminal 111 and IPDM E/R terminal 46.

      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  14.

    NG: GO TO  13.

  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E131, M92
    • 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  15.

    NG: Replace 15A fuse.

  15. CHECK GROUND CONNECTIONS 

    Loosen and retighten four ground screws on the body.

    Refer to "GROUND INSPECTION ."

    Fig 6: Identifying Body Grounds
    G04915248Courtesy 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. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminals 1, 115, 116 and ground.

      Refer to Wiring Diagram.

      Continuity should exist  .

    4. 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 F58, M70
    • 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 IP DM E/R. Refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ."

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

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