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Home >> Infiniti >> 2010 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0441 To P1212 >> DTC P0643: Sensor Power Supply >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connections M16, M70. Refer to "GROUND INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connections.

  2. CHECK ACCELERATOR PEDAL POSITION (APP) SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect APP sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between APP sensor harness connector and ground.
      CONNECTOR TERMINAL VOLTAGE CHART

      APP sensor Ground Voltage (V)
      Connector Terminal
      E113 4 Ground Approx. 5
      Fig 1: Checking Voltage Between APP Sensor Terminal 4 And Ground
      G04925503Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 3.

  3. CHECK SENSOR POWER SUPPLY CIRCUITS

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

    ECM SPECIFICATIONS

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F105 43 Electric throttle control actuator (bank 2) F51 1
    44 Electric throttle control actuator (bank 1) F31 6
    F106 60 Camshaft position (CMP) sensor (bank 1) F4 1
    Exhaust valve timing (EVT) control position sensor (bank 1) F82 1
    Power steering pressure (PSP) sensor F19 3
    M9 99 APP sensor E113 4

    Is the inspection result normal? 

    YES: GO TO 4.

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

  4. CHECK COMPONENTS

    Check the following.

  5. CHECK THROTTLE POSITION (TP) SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 6.

  6. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
    1. Replace electric throttle control actuator.
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      INSPECTION END

  7. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 8.

  8. REPLACE ACCELERATOR PEDAL ASSEMBLY
    1. Replace accelerator pedal assembly.
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      INSPECTION END

  9. CHECK INTERMITTENT INCIDENT

    Refer to "DESCRIPTION ".

    INSPECTION END