Diagnosis Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to , "GROUND INSPECTION ".

Fig 1: Identifying Body Ground Connections

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

OK or NG 

OK: GO TO 2.

NG: Repair or replace ground connections.

1. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
   • ← : Vehicle front
2. Turn ignition switch ON.
   Fig 2: Identifying Fuel Pump Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-III or tester.

Voltage: Approximately 5 V 

OK or NG 

OK: GO TO  4.

NG: GO TO 3.

Fig 3: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 4 And Ground

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

Check the following.

• Harness connectors B106, E138
• Harness connectors B148, B251
• Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

Repair harness or connector.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ECM terminal 67.

   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  6.

NG: GO TO 5.

Check the following.

• Harness connectors E5, F14
• Harness connectors B106, E138
• Harness connectors B148, B251
• Harness for open or short between "fuel level sensor unit and fuel pump" and ECM

Repair open circuit or short to ground or short to power in harness or connector.

Refer to , "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 7.

NG: Replace "fuel level sensor unit and fuel pump".

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END