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Home >> Nissan-Datsun >> 2012 >> Versa SL, 4D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction (Hatchback) >> Service Information >> Power Supply And Ground Circuit >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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 or tester.

      Voltage: Battery voltage 

      Fig 1: Checking ECM Power Supply Circuit-I
      G08275289Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  4.

      NG: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M69, E7
    • 10 A 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: Checking Ground Connections
      G08275290Courtesy of NISSAN NORTH AMERICA, INC.

      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 or tester.

      Voltage: Battery voltage 

      Fig 3: Checking ECM Power Supply Circuit-II
      G08275291Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: Proceed to "COMPONENT DESCRIPTION ".

      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 or tester.

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

      Fig 4: Checking ECM Power Supply Circuit-III
      G08275292Courtesy of NISSAN NORTH AMERICA, INC.

      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 or tester.

      Voltage: Battery voltage 

      Fig 5: Checking ECM Power Supply Circuit-IV
      G08275293Courtesy of NISSAN NORTH AMERICA, INC.

      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  m.

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

      OK or NG 

      OK: GO TO  17.

      NG: Replace 20 A fuse.

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

      Refer to "GROUND INSPECTION ".

      Fig 6: Checking Ground Connections
      G08275294Courtesy of NISSAN NORTH AMERICA, INC.

      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 "REMOVAL AND INSTALLATION OF IPDM E/R ".

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

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