Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.

   Refer to "GROUND INSPECTION ".

   Fig 1: Locating Three Ground Screws On Body

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

OK or NG 

1. OK: GO TO 2.
2. NG: Repair or replace ground connections.

1. Disconnect EVAP control system pressure sensor harness connector.
   Fig 2: Disconnecting EVAP Control System Pressure Sensor Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check sensor harness connector for water.
   1. Water should not exist. 

OK or NG 

1. OK: GO TO 3.
2. NG: Repair or replace harness connector.

1. Turn ignition switch ON.
2. Check voltage between EVAP control system pressure sensor terminal 1 and ground with CONSULT-II or tester.
   1. Voltage: Approximately 5V 

OK or NG 

1. OK: GO TO  5.
2. NG: GO TO 4.

Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 1

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

Check the following.

• Harness connectors B401, B251
• Harness connectors B211, M141
• Harness connectors M135, F105
• Harness for open or short between EVAP control system pressure sensor and ECM
  1. Repair open circuit or short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between EVAP control system pressure sensor terminal 3 and ECM terminal 67.

   Refer to WIRING DIAGRAM .

   1. Continuity should exist. 
4. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO  7.
2. NG: GO TO 6.

Check the following.

• Harness connectors B401, B251
• Harness connectors B211, M141
• Harness connectors M135, F105
• Harness for open or short between EVAP control system pressure sensor and ECM
  1. Repair open circuit or short to ground or short to power in harness or connectors.

1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.

   Refer to WIRING DIAGRAM .

   1. Continuity should exist. 
2. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO  9.
2. NG: GO TO 8.

Check the following.

• Harness connectors B401, B251
• Harness connectors B211, M141
• Harness connectors M135, F105
• Harness for open or short between EVAP control system pressure sensor and ECM
  1. Repair open circuit or short to ground or short to power in harness or connectors.

1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging, vent and kinked.

OK or NG 

1. OK: GO TO 10.
2. NG: Clean the rubber tube using an air blower.

Refer to "COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO 11.
2. NG: Replace EVAP canister vent control valve.

Refer to "COMPONENT INSPECTION ".

OK or NG 

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

Refer to "COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO 13.
2. NG: Replace water separator.

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

Yes or No 

1. Yes: GO TO 14.
2. No: GO TO  16.

Fig 4: Identifying EVAP Canister

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

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  16.
2. NG: GO TO 15.

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.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. INSPECTION END