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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 618 (Engine Control System (DTC/Circuit Diagnosis) (10 Of 17)) >> DTC/Circuit Diagnosis >> DTC P0451: EVAP Control System Pressure Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HOSE AND PIPING 
    1. Turn ignition switch OFF.
    2. Check the following.
      • Blockage, crush, or damage in the hose and the piping of EVAP purge line between fuel tank and intake manifold.
      • Blockage, crush, or damage in the hose and the piping of intake air passage between inlet air duct and intake manifold.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace error-detected parts.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Check EVAP control system pressure sensor. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    Replace ECM (built in barometric pressure sensor).

    NO

    Replace EVAP control system pressure sensor. Refer to Removal and Installation .