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Home >> Nissan-Datsun >> 2009 >> Versa Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction >> Service Information >> Power Supply And Ground Circuit >> Diagnosis Procedure
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Diagnosis 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 93 and ground with CONSULT- III or tester.

      Voltage: Battery voltage 

      Fig 1: Checking Voltage Between ECM Terminal 93 And Ground
      G05932552Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO  4.

      NG : GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M69, E7
    • 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 ground screw on the body.

      Refer to "GROUND INSPECTION ".

      Fig 2: Identifying Ground Connections Components
      G05932553Courtesy 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. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 10, 11, 108 and ground.

      Refer to Wiring Diagram.

      Continuity should exist  .

    3. 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 F8, E8
    • 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 3 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 3: Checking Voltage Between IPDM E/R Connector E119 Terminal 3 And Ground
      G05932554Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : Go to IGNITION SIGNAL .

      NG : GO TO 8.

  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 terminal 105 and ground with CONSULT-III or tester.

      Voltage: After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop approximately 0V  .

      Fig 4: Checking Voltage Between ECM Terminal 105 And Ground
      G05932555Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO  14.

      NG (Battery voltage does not exist.) : GO TO 9.

      NG (Battery voltage exists for more than a few seconds.) : GO TO  11.

  9. CHECK ECM POWER SUPPLY CIRCUIT-IV
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check voltage between ECM terminal 32 and ground with CONSULT- III or tester.

      Voltage: Battery voltage 

      Fig 5: Checking Voltage Between ECM Terminal 32 And Ground
      G05932556Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO 10.

      NG : GO TO  11.

  10. CHECK ECM POWER SUPPLY CIRCUIT-V
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E43.
    3. Check harness continuity between ECM terminal 105 and IPDM E/R terminal 4.

      Refer to Wiring Diagram.

      Continuity should exist  .

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

      OK or NG 

      OK : GO TO  17.

      NG : Repair open circuit or short to ground or short to power in harness or connectors.

  11. CHECK ECM POWER SUPPLY CIRCUIT-VI
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector E43.
    3. Check harness continuity between ECM terminal 32 and IPDM E/R terminal 7.

      Refer to Wiring Diagram.

      Continuity should exist  .

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

      OK or NG 

      OK : GO TO  13.

      NG : GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E8, F8
    • 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.

  13. CHECK 20A FUSE
    1. Disconnect 20A fuse from IPDM E/R.
    2. Check 20A fuse.

      OK or NG 

      OK : GO TO  17.

      NG : Replace 20A fuse.

  14. CHECK GROUND CONNECTIONS
    1. Loosen and retighten ground screw on the body.

      Refer to "GROUND INSPECTION ".

      Fig 6: Identifying Ground Connections Components
      G05932557Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO 15.

      NG : Repair or replace ground connections.

  15. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 10, 11, 108 and ground.

      Refer to Wiring Diagram.

      Continuity should exist  .

    3. Also check harness for short to power.

      OK or NG 

      OK : GO TO  17.

      NG : GO TO 16.

  16. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F8, E8
    • Harness for open or short between ECM and ground

      Repair open circuit or short to power in harness or connectors.

  17. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    OK : Replace IPDM E/R. Refer to IPDM E/R POWER/GROUND CIRCUIT INSPECTION .

    NG : Repair open circuit or short to power in harness or connectors.

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