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: Checking Rubber Tube

   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.
   Fig 2: Checking EVAP Canister Vent Control Valve-I

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

OK or NG 

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

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.
   Fig 3: Checking EVAP Canister Vent Control Valve With CONSULT-II

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

Without CONSULT-II 

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

Fig 4: Checking EVAP Canister Vent Control Valve Without CONSULT-II

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

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 5: 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.
   Fig 6: Checking EVAP Canister Saturation

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

Yes or No 

1. Yes GO TO 7.
2. No 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 Repair it.

1. Disconnect EVAP control system pressure sensor harness connector.

   View with rear left fender removed 

   Fig 7: Checking EVAP Control System Pressure Sensor Connector

   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.
   • Never apply force to the air hole protector of the sensor if equipped. 
     Fig 8: Identifying Air Hole Protector

     Courtesy of NISSAN MOTOR CO., U.S.A.
2. Remove EVAP control system pressure sensor from EVAP canister.

   Do not reuse the O-ring, replace it with a new one. 

3. Install a vacuum pump to EVAP control system pressure sensor.
4. Turn ignition switch "ON" and check output voltage between ECM terminal 32 and ground under the following conditions.
   Fig 9: Checking Output Voltage Between ECM Terminal 32 And Ground

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

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