Diagnostic Procedure

1. Turn ignition switch OFF.
2. Disconnect rubber tube connected to EVAP canister vent control valve.
3. Check the rubber tube for clogging.
   Fig 1: Identifying EVAP Canister Vent Control Valve

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 2.
2. NG: Clean rubber tube using an air blower.

1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B  of EVAP canister vent control valve for being rusted. See Figure .

OK or NG 

1. OK: GO TO 3.
2. NG: Replace EVAP canister vent control value.

With CONSULT-II 

1. Turn ignition switch ON.
2. Perform VENT CONTROL/V in ACTIVE TEST mode.
3. Check Air Passage Continuity And Operation Delay Time With CONSULT-II. See Figure .

   Without CONSULT-II 

   Check air passage continuity and operation delay time under the following conditions. See Figure .

   Make sure new O-ring is installed properly. 

OK or NG 

1. OK: GO TO  5 .
2. NG: GO TO 4.

1. Clean the air passage (Portion A  to B  ) of EVAP canister vent control valve using an air blower.
2. Perform Test No.  3 again.

OK or NG 

1. OK: GO TO 5.
2. NG: Replace EVAP canister vent control valve.

1. Turn ignition switch OFF.
2. Remove vacuum cut valve.
3. Check vacuum cut valve as follows:
   Fig 2: Checking Vacuum Cut Valve

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. Plug port C  and D  with fingers.
   2. Apply vacuum to port A  and check that there is no suction from port B. 
   3. Apply vacuum to port B  and check that there is suction from port A. 
   4. Blow air in port B  and check that there is a resistance to flow out of port A. 
   5. Open port C  and D. 
   6. Blow air in port A  check that air flows freely out of port C. 
   7. Blow air in port B  check that air flows freely out of port D. 

OK or NG 

1. OK: GO TO 6.
2. NG: Replace vacuum cut valve.

1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Check if water will drain from the EVAP canister. See Figure .

Yes or No 

1. OK: GO TO 7.
2. NG: GO TO  9 .

Weigh the EVAP canister with the EVAP canister vent control valve attached.

The weight should be less than 1.8 kg (4.0 lb). 

OK or NG 

1. OK: GO TO  9 .
2. NG: GO TO 8.

Check the following.

• EVAP canister for damage
• EVAP hose between EVAP canister and water separator for clogging or poor connection

1. Repair hose or replace EVAP canister.

Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.

OK or NG 

1. OK: GO TO 10.
2. NG: GO Repair it.

1. Disconnect EVAP control system pressure sensor harness connector.
   Fig 3: Locating EVAP Canister And EVAP Control System Pressure Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check connectors for water.

   Water should not exist. 

OK or NG 

1. OK: GO TO 11.
2. NG: Replace EVAP control system pressure sensor.

1. Remove EVAP control system pressure sensor with its harness connector connected. See Figure .
   CAUTION: Never apply force to the air hole protector of the sensor if equipped.
2. Remove hose from EVAP control system pressure sensor.
3. Turn ignition switch ON.
4. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in Figure .
   CAUTION:

   • Always calibrate the vacuum pump gauge when using it.
   • Do not apply below -20 KPa (-150 mmHg, -5.91 inHg) or over 20 KPa (150 mmHg, 5.91 inHg) of pressure.
5. Check input voltage between ECM terminal 60 and ground. See Figure and Figure .
   CAUTION: Discard and EVAP control system pressure sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.

OK or NG 

1. OK: GO TO 12.
2. NG: Replace EVAP control system pressure sensor.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

1. : INSPECTION END