Diagnosis Procedure

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.
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.
CHECK IF EVAP CANISTER 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 (1).
  2 : EVAP canister vent control valve
  
  Fig 1: Checking EVAP Canister Saturated With Water
  Courtesy of NISSAN MOTOR CO., U.S.A.
Does water drain from EVAP canister?

YES: GO TO 4.

NO: GO TO 6.
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.
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.
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.
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.
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

INSPECTION END