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Home >> Nissan-Datsun >> 2005 >> Maxima SL >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> 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-II or tester.

      Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  4.
    • NG: GO TO  3.
    Fig 1: Checking Voltage Between ECM Terminal 109 & Ground
    G02409872Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Tightening Ground Screws On Body
      G02409873Courtesy 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. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminals 1, 115, 116 and body ground. Refer to WIRING DIAGRAM - MAIN .

      Continuity should exist. 

    4. 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-II or tester.

      Voltage: Battery voltage 

    OK or NG

    Fig 3: Checking Voltage Between IPDM E/R Terminal 4 & Ground
    G02409874Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK ECM POWER SUPPLY 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 0 V. 

    OK or NG

    • OK: GO TO  18.
    • NG (Battery voltage does not exist.): GO TO  9.
    • NG (Battery voltage exists for more than a few seconds.): GO TO  18.
      Fig 4: Checking Voltage Between ECM Terminals 119, 120 & Ground
      G02409875Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK ECM POWER SUPPLY CIRCUIT-V 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check voltage between ECM terminal 111 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  10.
    • NG: GO TO  12.
    Fig 5: Checking Voltage Between ECM Terminal 111 & Ground
    G02409876Courtesy of NISSAN MOTOR CO., U.S.A.
  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 - MAIN .

      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 - MAIN .

      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  18.
    • NG: Replace 15A fuse.
  15. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten four ground screws on the body.

      Refer to GROUND INSPECTION .

      Fig 6: Checking Ground Connections
      G02409877Courtesy 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 - MAIN .

      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 IPDM E/R.
    • NG: Repair open circuit or short to power in harness or connectors.
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