Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
   Fig 1: Identifying Engine Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. GO TO 2.

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

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check sensor harness connector for water.

   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 3 and ground with CONSULT-II or tester.

   Voltage: Approximately 5V 

Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO  5.
2. NG: GO TO 4.

Check the following.

• Harness connectors B1, M14
• Harness connectors M59, F27
• Harness for open or short between EVAP control system pressure sensor and ECM
  1. Repair harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector (A/T models).
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 

1. OK: GO TO  7.
2. NG: GO TO 6.

Check the following.

• Harness connectors B1, M14
• Harness connectors M58, F26
• Harness for open or short between EVAP control system pressure sensor and TCM
• 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 ECM harness connector.
2. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. 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 B1, M14
• Harness connectors M58, F26
• Harness for open or short between ECM and EVAP control system pressure sensor
  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.

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.

Check obstructed rubber tube connected to EVAP canister vent control valve.

OK or NG 

1. OK: GO TO 13.
2. NG: Clean rubber tube using an air blower, repair or replace rubber tube.

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.
Fig 4: Checking EVAP Canister For Water Saturation
Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No 

1. Yes: GO TO 14.
2. No: GO TO  16.

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

The weight should be less than 1.9 kg (4.2 lb). 

OK or NG 

1. OK: GO TO  16.
2. NG: GO TO 15.

Check the following.

• EVAP canister for damage
• EVAP hose connected to EVAP canister for clogging or poor connection
  1. Repair hose or replace EVAP canister.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. INSPECTION END