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Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0460 Through P1217 >> 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 connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. 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
      M153(1)
      M9(2)      		 6(1)
      5(2)      		 Ground Approx. 5
      (1) With ICC
      (2) Without ICC

      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 Sensor
    Connector Terminal Name Connector Terminal
    F101 43 Electric throttle control actuator (bank 2) F27 1
    44 Electric throttle control actuator (bank 1) F67 6
    F102 60 CMP sensor (PHASE) (bank 1) F5 1
    Manifold absolute pressure (MAP) sensor F50 1
    PSP sensor F35 3
    M107 99 APP sensor M153(1)
    M9(2)    		 6(1)
    5(2)
    (1) With ICC
    (2) Without ICC

    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.

    • Camshaft position sensor (PHASE) (bank 1) (Refer to "COMPONENT INSPECTION ".)
    • Manifold absolute pressure (MAP) sensor (Refer to "COMPONENT INSPECTION ".)
    • Power steering pressure sensor (Refer to "COMPONENT INSPECTION ".)

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Replace malfunctioning component.

  5. CHECK 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 "INTERMITTENT INCIDENT ".

    : INSPECTION END

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