Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
   Fig 1: Loosening & Retightening Ground Screws

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

OK or NG

• OK: GO TO 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.
   • Water should not exist. 

OK or NG

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

1. Turn ignition switch ON.
2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-II or tester.
   Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 & Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   • Voltage: Approximately 5V 

OK or NG

• OK: GO TO  5.
• NG: GO TO 4.

Check the following.

• Harness connectors B106, E138
• Harness connectors E19, F33
• Harness for open or short between EVAP control system pressure sensor and ECM

• : 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. Disconnect TCM harness connector.
4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42.

   Refer to WIRING DIAGRAM .

   • Continuity should exist 
5. Also check harness for short to ground and short to power.

OK or NG

• OK: GO TO  7.
• NG: GO TO 6.

Check the following.

• Harness connectors E19, F33
• Harness connectors B106, E138
• Harness for open or short between EVAP control system pressure sensor and ECM
• Harness for open or short between EVAP control system pressure sensor and TCM

• : 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 .

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

OK or NG

• OK: GO TO  9.
• NG: GO TO 8.

Check the following.

• Harness connectors E19, F33
• Harness connectors B106, E138
• Harness for open or short between EVAP control system pressure sensor and ECM

• : 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

• OK: GO TO 10.
• NG: Clean the rubber tube using an air blower, repair or replace rubber tube.

Refer to "COMPONENT INSPECTION ".

OK or NG

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

Refer to "COMPONENT INSPECTION ".

OK or NG

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

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.

Yes or No

• Yes: GO TO 13.
• No: GO TO  15.
  Fig 4: Checking EVAP Canister Saturated With Water

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

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). 

OK or NG

• OK: GO TO  15.
• NG: GO TO 14.

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.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

• : INSPECTION END