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Home >> Infiniti >> 2008 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VQ35DE) - 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 

    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-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

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

    Check the following.

    • Fuse block (J/B) connector M4
    • 15A 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-I 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 2: Identifying Body Ground M70 And M16
      G05209527Courtesy 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 F102, M72
    • 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 

    OK or NG 

    OK: GO TO "IGNITION SIGNAL ".

    NG: GO TO 8.

    Fig 3: Checking Voltage Between IPDM E/R Terminal 17 And Ground
    G05217148Courtesy 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. 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  .

    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: Checking Voltage Between ECM Terminals 119, 120 And Ground
    G04900131Courtesy of NISSAN MOTOR CO., U.S.A.
  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-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 10.

    NG: GO TO  12.

    Fig 5: Checking Voltage Between ECM Terminal 111 And Ground
    G04900132Courtesy 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 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 ECM harness connector.
    2. Disconnect IPDM E/R harness connector E9.
    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 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.

  14. CHECK 20A FUSE 
    1. Disconnect 20A fuse from IPDM E/R.
    2. Check 20A fuse.

    OK or NG 

    OK: GO TO  18.

    NG: Replace 20A fuse.

  15. CHECK GROUND CONNECTIONS-II 

    Loosen and retighten two ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 6: Identifying Body Ground M70 And M16
    G05209531Courtesy 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 F102, M72
    • 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 "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ".

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

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