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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (2 Of 4)) >> DTC/Circuit Diagnosis >> DTC P0448: EVAP Canister Vent Control Valve >> DTC Diagnosis Procedure >> PR25DD engine

PR25DD engine

WARNING: This page is about a different variant/trim than selected.
  1. CHECK RUBBER TUBE 
    1. Turn ignition switch OFF.
    2. Disconnect rubber tube connected to EVAP canister vent control valve.
    3. Check the rubber tube for clogging.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Clean rubber tube using an air blower.

  2. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Check the EVAP canister vent control valve. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Replace EVAP canister vent control valve. Refer to Removal and Installation (AWD) or Removal and Installation (FWD).

  3. CHECK IF EVAP CANISTER IS SATURATED WITH WATER 
    1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
    2. Check if water will drain from the EVAP canister.
      G04160077Courtesy of NISSAN NORTH AMERICA, INC.

    Does water drain from EVAP canister?

    YES

    GO TO 4.

    NO

    GO TO 6.

  4. CHECK EVAP CANISTER 

    Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

    The weight should be less than 2.1 kg (4.6 lb).

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • EVAP canister for damage
    • EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

    Repair hose or replace EVAP canister. Refer to Removal and Installation (AWD) or Removal and Installation (FWD).

  6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR 
    1. Disconnect EVAP control system pressure sensor harness connector.
    2. Check connectors for water.

      Water should not exist.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Replace EVAP control system pressure sensor. Refer to Removal and Installation (AWD) or Removal and Installation (FWD).

  7. 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 (AWD) or Removal and Installation (FWD).

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