Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0448 EVAP canister vent control valve
Diagnosis Procedure

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 EC, "Component Inspection".

Is the inspection result normal?

YES >> GO TO 3.

NO >> Replace EVAP canister vent control valve. Refer to FL, "Removal and Installation".

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.

Does water drain from EVAP canister?

YES >> GO TO 4.

NO >> GO TO 6.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

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 1.6 kg (3.5 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 FL, "Removal and Installation".

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 FL, "Removal and Installation".

7.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check the EVAP control system pressure sensor. Refer to EC, "Component Inspection".

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".

NO >> Replace EVAP control system pressure sensor. Refer to FL, "Removal and Installation".

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