Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 7) >> Engine (ECM) >> P0451 EVAP Control System Pressure Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  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>>

    GO TO 3

    .

    NO>>

    Replace EVAP control system pressure sensor. Refer to EVAP CANISTER : Exploded View .

  3. CHECK MAP SENSOR 

    Check MAP sensor. Refer to Component Inspection . Is the inspection result normal?

    YES>>

    Check intermittent incident. Refer to Inspection .

    NO>>

    Repair or replace malfunctioning part. Refer to ECM : Removal and Installation .