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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 501 (Engine Control System (DTC/Circuit Diagnosis) (2 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0451: EVAP Control System Pressure Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. 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. Turn ignition switch OFF.
    2. Disconnect EVAP control system pressure sensor harness connector.
    3. Check sensor harness connector for water.

      Water should not exist.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace harness connector.

  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.
      G04075010Courtesy of NISSAN NORTH AMERICA, INC.

      +

      -

      Voltage

      (Approx.)

      EVAP control system pressure sensor

      Connector

      Terminal

      C4

      3

      Ground

      5 V

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 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.

      +

      -

      Continuity

      EVAP control system pressure sensor

      ECM

      Connector

      Terminal

      Connector

      Terminal

      C4

      3

      E16

      125

      Existed
    4. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for power supply circuit.

    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.

      +

      -

      Continuity

      EVAP control system pressure sensor

      ECM

      Connector

      Terminal

      Connector

      Terminal

      C4

      1

      E16

      148

      Existed
    4. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace error-detected parts.

  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR SIGNAL CIRCUIT 
    1. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

      +

      -

      Continuity

      EVAP control system pressure sensor

      ECM

      Connector

      Terminal

      Connector

      Terminal

      C4

      2

      E16

      121

      Existed
    2. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace error-detected parts.

  6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Check the 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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