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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P31A5 >> 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 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 1
    F102 60 CMP sensor (PHASE) (bank 1) F5 1
    EVT control position sensor (bank 1) F4 1
    M107 111 Manifold absolute pressure (MAP) sensor F50 1
    EOP sensor F51 3

    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.

  4. CHECK TP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
    1. Replace electric throttle control actuator. Refer to "EXPLODED VIEW ".
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END