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Home >> Infiniti >> 2015 >> QX80 Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Trouble Codes (DTCS) P0181-P1550) >> DTC/Circuit Diagnosis >> DTC P0451: EVAP Control System Pressure Sensor >> Diagnosis Procedure >> Diagnostic Test
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Diagnostic Test

  1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

    1. Disconnect EVAP control system pressure sensor harness connector.
    2. Check that water is not inside connectors.

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair or replace harness connector.

  2. 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.
      EVAP control system pressure sensor Ground Voltage (V)
      Connector Terminal
      C17 3 Ground Approx. 5 V

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 3  .

  3. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F110 76 Crankshaft position sensor F74 1
    77 Camshaft position sensor (bank 1) F84 1
    E80 133 EVAP control system pressure sensor C17 3
    Battery current sensor E63 2
    Refrigerant pressure sensor E77 1
    131 APP sensor 2 (Without ICC) E110 1
    APP sensor 2 (with ICC) E213 10

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair short to ground or short to power in harness or connectors.

  4. CHECK COMPONENTS

    Check the following.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Replace malfunctioning component.

  5. CHECK APP SENSOR

    Refer to COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) .

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    GO TO STEP 6  .

  6. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly.

    Refer to REMOVAL AND INSTALLATION (Without distance control assist system)

    Refer to REMOVAL AND INSTALLATION (With distance control assist system).

    INSPECTION END

  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Refer to COMPONENT INSPECTION (EVAP CONTROL SYSTEM PRESSURE SENSOR) .

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Replace EVAP control system pressure sensor.

  8. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END