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Home >> Infiniti >> 2010 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ35HR) - DTC P0196 Through P0607 >> DTC P0451: EVAP Control System Pressure Sensor >> 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 EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER 
    1. Disconnect EVAP control system pressure sensor harness connector.
    2. Check sensor harness connector for water.

      Water should not exist. 

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: Repair or replace harness connector.

  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check the voltage between EVAP control system pressure sensor harness connector and ground.
      VOLTAGE REFERENCE TABLE

      EVAP control system pressure sensor Ground Voltage (V)
      Connector Terminal
      B252 3 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO  4.

  4. CHECK SENSOR POWER SUPPLY CIRCUIT 

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

    CONNECTOR TERMINALS REFERENCE TABLE

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F101 46 Crankshaft position (CKP) sensor F2 1
    F102 64 Camshaft position (CMP) sensor (bank 2) F18 1
    Exhaust valve timing (EVT) control position sensor (bank 2) F19 1
    Battery current sensor E21 1
    M107 103 Accelerator pedal position (APP) sensor E112 (Without ICC) 6
    E116 (With ICC) 3
    107 EVAP control system pressure sensor B252 3
    111 Refrigerant pressure sensor E77 3

    Is the inspection result normal? 

    YES: GO TO  5.

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

  5. CHECK COMPONENTS 

    Check the following.

  6. CHECK APP SENSOR 

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO  7.

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

      INSPECTION END

  8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: Replace EVAP control system pressure sensor.

  9. CHECK INTERMITTENT INCIDENT 

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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