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Home >> Infiniti >> 2017 >> QX80 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (2 Of 4) >> DTC/Circuit Diagnosis >> DTC P0451: EVAP Control System Pressure Sensor >> Diagnosis Procedure >> Diagnostic Test

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 4  .

    NO 

    GO TO STEP 3  .

  3. CHECK SENSOR POWER SUPPLY 3 CIRCUIT

    Perform DIAGNOSIS PROCEDURE .

    Is the inspection result normal?

    YES 

    Perform the trouble diagnosis for power supply circuit. Refer to DIAGNOSIS PROCEDURE .

    NO 

    Repair or replace error-detected parts.

  4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

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

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Replace EVAP control system pressure sensor.

  5. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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