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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Murano. 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.

    Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  4.
    2. NG: GO TO 3.
      Fig 1: Checking ECM Power Supply Circuit-I
      G00767955Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector M1
    • 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-1
    • Harness connectors F102, M82
    • Harness for open or short between ECM and ground
    1. Repair open circuit or short to power in harness or connectors.
  6. CHECK ECM POWER SUPPLY 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 ECM Power Supply Circuit-II
      G00767956Courtesy of NISSAN MOTOR CO., U.S.A.
  7. 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 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 ECM Power Supply Circuit-III
      G00767957Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK ECM POWER SUPPLY 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 ECM Power Supply Circuit-V
      G00767958Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK ECM POWER SUPPLY 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.

    • Harness or connectors E110, M7
    • 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 ECM POWER SUPPLY 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 E109, M6
    • 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. 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  16.
    2. NG: GO TO 15.
  15. DETECT MALFUNCTIONING PART

    Check the following.

    • Joint connector-1
    • Harness connectors F102, M82
    • 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 ground or short to power in harness or connectors.
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