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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (2 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0451: EVAP Control System Pressure Sensor >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

    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 error-detected parts.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY

    1. Turn ignition switch ON.
    2. Check the voltage between EVAP control system pressure sensor harness connector and ground.
      + - Voltage (V)
      EVAP control system pressure sensor
      Connector Terminal
      B36 3 Ground Approx. 5

    Is the inspection result normal?

    YES 

    GO TO STEP 4. 

    NO 

    GO TO STEP 3. 

  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B36 3 E32 125 Existed

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

  4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
      EVAP control system pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      B36 1 E32 148 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace error-detected parts.

  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Check EVAP control system pressure sensor. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Replace EVAP control system pressure sensor. Refer to REMOVAL AND INSTALLATION .

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