Diagnosis Procedure

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

   Refer to "GROUND INSPECTION ".

   • <= : Vehicle front
   • Body ground (1)

     OK or NG 

     OK: GO TO 2.

     NG: Repair or replace ground connections.

     Fig 1: Identifying Body Ground Screws

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

1. Disconnect EVAP control system pressure sensor (1) harness connector.
   • This illustration is a view from under vehicle
   • EVAP canister (2)
   • EVAP canister vent control valve (3)

     Water should not exist. 

     Fig 2: Identifying EVAP Control System Pressure Sensor, EVAP Canister And EVAP Canister Vent Control Valve

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

   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 5 V 

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

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

   OK or NG 

   OK: GO TO  12.

   NG: GO TO 4.

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 76. Refer to WIRING DIAGRAM .

   Continuity should exist. 

   OK or NG 

   OK: GO TO  6.

   NG: GO TO 5.

Check the following.

• Harness connectors E3, F2
• Harness connectors B9, E13
• 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.

Check harness for short to power and short to ground between the following terminals.

OK or NG 

OK: GO TO 7.

NG: Repair short to ground or short to power in harness or connectors.

Refer to "DIAGNOSIS PROCEDURE ".

OK or NG 

OK: GO TO 8.

NG: Replace intake manifold adapter.

Refer to TROUBLE DIAGNOSIS .

OK or NG 

OK: GO TO 9.

NG: Replace refrigerant pressure sensor.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 10.

NG: Replace crankshaft position sensor (POS).

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO  17.

NG: GO TO 11.

1. Replace accelerator pedal assembly.
2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".
3. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
4. Perform "IDLE AIR VOLUME LEARNING ".

   INSPECTION END 

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 51. Refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

   OK or NG 

   OK: GO TO  14.

   NG: GO TO 13.

Check the following.

• Harness connectors E3, F2
• Harness connectors B9, E13
• 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 42 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  16.

   NG: GO TO 15.

Check the following.

• Harness connectors E3, F2
• Harness connectors B9, E13
• Harness for open or short between ECM and EVAP control system pressure sensor

  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 17.

NG: Replace EVAP control system pressure sensor.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END