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.
   • Vehicle Front
   • EVAP canister vent control valve (1)
   • EVAP canister (2)
2. Check sensor harness connector for water.

Water should not exist  .

Fig 2: Identifying EVAP Canister Vent Control Valve To EVAP Canister

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

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.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 10.

NG: Replace EVAP control system pressure sensor.

Refer to "DIAGNOSIS PROCEDURE ".

INSPECTION END