LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1057 (Engine Control System) >> Power Supply And Ground Circuit >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START 

    Start engine.

    Is engine running? 

    Yes or No 

    1. Yes: GO TO  7 .
    2. 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.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  4 .
    2. NG: GO TO 3.
      Fig 1: Checking Voltage Between ECM And Ground
      G00775268Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E30
    • 10A fuse
    • Harness for open or short between ECM and fuse
      1. Repair harness or connectors.
  4. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground three screws on the body. Refer to GROUND INSPECTION  .
      Fig 2: Checking Ground Connections
      G00775269Courtesy 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. 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  .
      1. Continuity should exist. 
    4. 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 F14, E5
    • Harness for open or short between ECM and body ground
      1. 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.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: go to IGNITION SIGNAL  .
    2. NG: GO TO 8.
      Fig 3: Checking Voltage Between IPDM And Ground
      G00775270Courtesy 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.
      1. 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 9.
    3. NG (Battery voltage exists for more than a few seconds.):GO TO  16 .
      Fig 4: Checking Voltage Between ECM And Ground
      G00775271Courtesy 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.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO 10.
    2. NG: GO TO  11 .
      Fig 5: Checking Voltage Between ECM And Ground
      G00775272Courtesy 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  .
      1. 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: Repair open circuit or short to ground or short to power in harness or connectors.
  11. 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  .
      1. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 12.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  12. 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.
  13. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground three screws on the body. Refer to GROUND INSPECTION  .
      Fig 6: Checking Ground Connections
      G00775273Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 14.
    2. NG: Repair or replace ground connections.
  14. 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  .
      1. Continuity should exist. 
    4. 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.

    • Harness connectors F14, E5
    • Harness for open or short between ECM and ground
      1. Repair open circuit or short to power in harness or connectors.
  16. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    OK or NG 

    1. OK: Replace IPDM E/R.
    2. NG: Repair open circuit or short to power in harness or connectors.
scientia non olet · About LEMON Manuals