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Home >> Nissan-Datsun >> 2012 >> Quest LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0455 To P1226 >> DTC P0643: Sensor Power Supply >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY
    1. Disconnect accelerator pedal position (APP) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between APP sensor harness connector and ground.
      APP sensor Ground Voltage (V)
      Connector Terminal
      E110 4 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 2.

  2. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F7 24 TP sensor F29 1
    F8 75 Battery current sensor F76 1
    83 CMP sensor (PHASE) (bank 1) F26 1
    87 CMP sensor (PHASE) (bank 2) F69 1
    E16 99 APP sensor E110 4

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair short to ground or short to power in harness or connectors.

  3. CHECK COMPONENTS

    Check the following.

    • Camshaft position sensor (PHASE) (Refer to "COMPONENT INSPECTION ".)
    • Battery current sensor (Refer to "COMPONENT INSPECTION ".)

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Replace malfunctioning component.

  4. CHECK TP SENSOR

    Check TP sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Replace electric throttle control actuator. Refer to "EXPLODED VIEW ".

  5. CHECK APP SENSOR

    Check APP sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Replace accelerator pedal assembly. Refer to "EXPLODED VIEW ".