LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Engine Control System - DTCS P0137 Through P0456) >> DTC P0448: EVAP Canister Vent Control Valve >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. 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 2.

      NO: Clean rubber tube using an air blower.

  2. CHECK 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 "VK50VE: EXPLODED VIEW ".

  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. Refer to "VK50VE: EXPLODED VIEW ".
    2. Check if water will drain from the EVAP canister (1).
      • EVAP canister vent control valve (2)

      Does water drain from EVAP canister? 

      YES: GO TO 4.

      NO: GO TO  6.

      Fig 1: Checking EVAP Canister For Water Saturation
      G09001471Courtesy of NISSAN NORTH AMERICA, INC.
  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 "VK50VE: 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 7.

      NO: Replace EVAP control system pressure sensor. Refer to "VK50VE: EXPLODED VIEW ".

  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace EVAP control system pressure sensor. Refer to "VK50VE: EXPLODED VIEW ".

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

scientia non olet · About LEMON Manuals