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Home >> Nissan-Datsun >> 2009 >> Versa Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P2A00 >> DTC P0643 Sensor Power Supply >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Ground Connections Components
      G05932863Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO 2.

      NG : Repair or replace ground connections.

  2. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect accelerator pedal position (APP) sensor (1) harness connector.
    2. Turn ignition switch ON.
      Fig 2: Identifying APP Sensor Harness Connector
      G05932864Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between APP sensor terminal 4 and ground with CONSULT-III or tester.

      Voltage: Approximately 5V 

      OK or NG 

      OK : GO TO  8.

      NG : GO TO 3.

      Fig 3: Checking Voltage Between APP Sensor Terminal 4 And Ground
      G04925503Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between APP sensor terminal 4 and ECM terminal 106.

      Refer to Wiring Diagram.

      Continuity should exist  .

      OK or NG 

      OK : GO TO 4.

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

  4. CHECK SENSOR POWER SUPPLY CIRCUITS

    Check harness for short to power and short to ground, between the following terminals.

    ECM TERMINAL CHART

    ECM terminal Sensor terminal Refer To
    72 Throttle position sensor terminal 1 "WIRING DIAGRAM "
    78 Camshaft position sensor (PHASE) terminal 1 "WIRING DIAGRAM "
    106 APP sensor terminal 4 "WIRING DIAGRAM "

    OK or NG 

    OK : GO TO 5.

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

  5. CHECK CAMSHAFT POSITION SENSOR (PHASE)

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 6.

    NG : Replace camshaft position sensor (PHASE).

  6. CHECK THROTTLE POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO  8.

    NG : GO TO 7.

  7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
    1. Replace the electric throttle control actuator.
    2. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
    3. Perform "IDLE AIR VOLUME LEARNING ".

      INSPECTION END 

  8. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 9.

    NG : GO TO 8.

  9. REPLACE ACCELERATOR PEDAL ASSEMBLY
    1. Replace accelerator pedal assembly.
    2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".
    3. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
    4. Perform "IDLE AIR VOLUME LEARNING ".

      INSPECTION END 

  10. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    INSPECTION END 

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