Diagnosis Procedure

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

Refer to "GROUND INSPECTION ".

Fig 1: Identifying Body Ground (M70 And M16)

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 (3) harness connector.
   • Illustration shows the view from under the vehicle.
     Fig 2: Identifying EVAP Control System Pressure Sensor Harness Connector

     Courtesy of NISSAN MOTOR CO., U.S.A.
   • EVAP canister vent control valve (1)
   • EVAP canister (2)
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-III or tester.

Voltage: Approximately 5V 

OK or NG 

OK: GO TO  5.

NG: GO TO 4.

Fig 3: Checking Voltage Between Ignition Coil Terminal 3 And Ground

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

Check the following.

• Harness connectors B171, B469
• Harness connectors B418, M66
• Harness connectors M72, F102
• 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. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67.

   Refer to SYSTEM WIRING DIAGRAMS article.

   Continuity should exist  .

4. 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 B171, B469
• Harness connectors B418, M66
• Harness connectors M72, F102
• 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. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.

   Refer to SYSTEM WIRING DIAGRAMS article.

   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 B171, B469
• Harness connectors B418, M66
• Harness connectors M72, F102
• 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 or 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 (1).

• EVAP canister vent control valve (2)

Yes or No 

Yes: GO TO 13.

No: GO TO  15.

Fig 4: Checking EVAP Canister For Water Drain

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 2.0 kg (4.4 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 "DIAGNOSIS PROCEDURE ".

INSPECTION END