LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2006 >> G35 x >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction (Sedan) >> Power Supply And Ground Circuit >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

  1. INSPECTION START 

    Start engine.

    Is engine running? 

    Yes or No 

    1. Yes: GO TO 8.
    2. No: GO TO 2.
  2. CHECK ECM POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    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: Identifying Voltage Between ECM Terminal 109 And Ground With CONSULT-II Or Tester
    G04119654Courtesy 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 two ground screws on the body. Refer to "GROUND INSPECTION ".
    Fig 2: Identifying Ground Connections
    G04119655Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. 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 

    1. OK: GO TO 7.
    2. 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 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 

    1. OK: Go to "IGNITION SIGNAL ".
    2. NG: GO TO 8.
    Fig 3: Identifying Voltage Between IPDM E/R Terminal 17 And Ground With CONSULT-II Or Tester
    G04119656Courtesy 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 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 15.
    2. NG (Battery voltage does not exist.): GO TO 9.
    3. NG (Battery voltage exists for more than a few seconds.): GO TO 12.
    Fig 4: Identifying Voltage Between ECM Terminals 119, 120 And Ground With CONSULT-II Or Tester
    G04119657Courtesy 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 

    1. OK: GO TO 10.
    2. NG: GO TO 12.
    Fig 5: Identifying Voltage Between ECM Terminal 111 And Ground With CONSULT-II Or Tester
    G04119658Courtesy 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 

    1. OK: GO TO 18.
    2. 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 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 .

      4. 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 13.
  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E11, F2
    • 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 

    1. OK: GO TO 18.
    2. NG: Replace 15A fuse.
  15. CHECK GROUND CONNECTIONS 
    1. Loosen and retighten two ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 6: Identifying Ground Connections
      G04119659Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 16.
    2. 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 

    1. OK: GO TO 18.
    2. 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 connectors.

  18. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    1. OK: Replace IPDM E/R. Refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ".
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
scientia non olet · About LEMON Manuals