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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 P0448: EVAP Canister Vent Control Valve >> 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 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 STEP 2  .

    NO 

    Clean rubber tube using an air blower.

  2. CHECK EVAP CANISTER VENT CONTROL VALVE

    Check EVAP canister vent control valve. Refer to COMPONENT INSPECTION .

    Is he inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Replace EVAP canister vent control valve. Refer to REMOVAL AND INSTALLATION .

  3. CHECK IF EVAP CANISTER SATURATED WITH WATER

    1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to REMOVAL AND INSTALLATION .
    2. Check if water will drain from the EVAP canister.
      G05889648Courtesy of NISSAN NORTH AMERICA, INC.

    Does water drain from the EVAP canister?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 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 STEP 6  .

    NO 

    GO TO STEP 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 .

  6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

    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 7  .

    NO 

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

  7. 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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