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. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A  and C  are not clogged by blowing air into B  with A  , and then C  plugged.
   Fig 2: Checking Water Separator

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. In case of NG in items 2 - 4, replace the parts.

OK or NG 

1. OK: GO TO 3.
2. NG: Clean or replace water separator.

1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B  of EVAP canister vent control valve for being rusted.
   Fig 3: Checking Portion B Of EVAP Canister Vent Control Valve

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

OK or NG 

1. OK: GO TO 4.
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 4: Checking Air Passage Continuity And Operation Delay Time Using CONSULT II (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 5: Checking Air Passage Continuity And Operation Delay Time Using CONSULT II (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  6 .
2. NG: GO TO 5.

1. Clean the air passage (Portion A  to B  ) of EVAP canister vent control valve using an air blower.
2. Perform the procedure 4 again.

OK or NG 

1. OK: GO TO 6.
2. NG: Replace EVAP canister vent control valve.

1. e EVAP canister with EVAP canister vent control valve attached.
2. Check if water will drain from the EVAP canister.
   Fig 6: Removing EVAP Canister With EVAP Canister Vent Control Valve Attached

   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.

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.
   Fig 7: Disconnecting EVAP Control System Pressure Sensor Harness 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: Installing Vacuum Pump To EVAP Control System Pressure Sensor

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

   • Always calibrate the vacuum pump gauge when using it.
   • Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
   • 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