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Home >> Infiniti >> 2008 >> G37 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - G37 Coupe - DTC P0300 Through P1091 >> 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.
      TERMINALS VOLTAGE REFERENCE

      EVAP control system pressure sensor Ground Voltage
      Connector Terminal
      B30 3 Ground Approx. 5V

    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.

    ECM SENSOR REFERENCE CHART

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F101 45 Brake booster pressure sensor E48 1
    46 CKP sensor (POS) F2 1
    M107 103 APP sensor E112 6
    107 EVAP control system pressure sensor B30 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.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace malfunctioning component.

  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