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Home › Infiniti › 2012 › QX56 AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS P0500 To P1424 › DTC P0643: Sensor Power Supply › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
    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 (Without ICC) 2 Ground Approx. 5
    E67 (With ICC) 12

    Is the inspection result normal? 

    YES: GO TO  6.

    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
    F111 81 Electric throttle control actuator F66 2
    83 Camshaft position sensor (bank 2) F83 1
    85 Manifold absolute pressure (MAP) sensor F65 1
    E80 137 APP sensor 1 (Without ICC) E110 2
    137 APP sensor 1 (With ICC) E67 12

    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.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Replace malfunctioning component.

  4. CHECK THROTTLE POSITION SENSOR

    Refer to "COMPONENT INSPECTION (THROTTLE POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 5.

  5. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

    Replace electric throttle control actuator. Refer to "REMOVAL AND INSTALLATION ".

    : INSPECTION END

  6. CHECK ACCELERATOR PEDAL POSITION SENSOR

    Refer to "COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 7.

  7. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly. Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (Without distance control assist system) or "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (With distance control assist system).

    : INSPECTION END

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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