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Home >> Infiniti >> 2003 >> G35 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls System - Introduction - Coupe >> Power Supply Circuit For ECM >> Diagnostic Procedure

Diagnostic Procedure

  1. INSPECTION START 

    Start engine.

    Is engine running? 

    Yes or No 

    1. Yes: GO TO  7.
    2. No: GO TO 2.
  2. CHECK  POWER SUPPLY CIRCUIT FOR ECM   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 

    1. OK: GO TO  4.
    2. NG: GO TO 3.
      Fig 1: Checking Voltage Between ECM Terminal 109 And Ground
      G03582954Courtesy 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
    1. : Repair harness or connectors.
  4. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I 
    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 

    1. OK: GO TO  6.
    2. NG: GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Joint connector-4
    • Harness connectors F102, M72
    • Harness for open or short between ECM and ground
    1. : Repair open circuit or short to power in harness or connectors.
  6. CHECK  POWER SUPPLY CIRCUIT FOR ECM   CIRCUIT-II 
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check voltage between IPDM E/R terminal 35 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: Go to "IGNITION SIGNAL ".
    2. NG: GO TO 7.
      Fig 2: Checking Voltage Between IPDM E/R Terminal 35 And Ground
      G03582955Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK  POWER SUPPLY CIRCUIT FOR ECM   CIRCUIT-III 
    1. Turn ignition switch ON and then OFF.
    2. 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 

    1. OK: GO TO  16.
    2. NG (Battery voltage does not exist.): GO TO 8.
    3. NG (Battery voltage exists for more than a few seconds.): GO TO  16.
      Fig 3: Checking Voltage Between ECM Terminals 119, 120 And Ground
      G03582956Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK  POWER SUPPLY CIRCUIT FOR ECM   CIRCUIT-V 
    1. Turn ignition switch OFF.
    2. Check voltage between ECM terminal 111 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO 9.
    2. NG: GO TO  11.
      Fig 4: Checking Voltage Between ECM Terminal 111 And Ground
      G03582957Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK  POWER SUPPLY CIRCUIT FOR ECM   CIRCUIT-VI 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E8.
    3. Check harness continuity between ECM terminals 119, 120 and IPDM E/R terminal 33.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  14.
    2. NG: GO TO 10.
  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Joint connector-3
    • Joint connector-4
    • Harness or connectors E12, F3
    • Harness for open or short between ECM and IPDM E/R
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  11. CHECK  POWER SUPPLY CIRCUIT FOR ECM   CIRCUIT-VII 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check harness continuity between ECM terminal 111 and IPDM E/R terminal 44.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  13.
    2. NG: GO TO 12.
  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E11, F2
    • Harness for open or short between ECM and IPDM E/R
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  13. CHECK 15A FUSE 
    1. Disconnect 15A fuse from IPDM E/R.
    2. Check 15A fuse.

    OK or NG 

    1. OK: GO TO  16.
    2. NG: Replace 15A fuse.
  14. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II 
    1. Check harness continuity between ECM terminals 1, 115, 116 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    2. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO  16.
    2. NG: GO TO 15.
  15. DETECT MALFUNCTIONING PART 

    Check the following.

    • Joint connector-4
    • Harness or connectors F102, M72
    • Harness for open or short between ECM and ground
    1. : Repair open circuit or short to power in harness connectors.
  16. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    1. OK: Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION OF IPDM E/R in IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) - G35 COUPE article. .
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
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