Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to GROUND INSPECTION  .
   Fig 1: Checking Ground Connections

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

OK or NG 

1. OK: GO TO 2.
2. NG: Repair or replace ground connections.

1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
3. Turn ignition switch ON.
   Fig 2: Disconnecting Fuel Level Sensor Unit And Fuel Pump Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
   Fig 3: Checking Voltage Between Terminal 4 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. Voltage: Approximately 5V 

OK or NG 

1. OK: GO TO  4 .
2. NG: GO TO 3.

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"
  1. Repair harness or connector.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect TCM harness connector.
4. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ECM terminal 67, TCM terminal 42. Refer to WIRING DIAGRAM  .
   1. Continuity should exist. 
5. Also check harness for short to ground or short to power.

OK or NG 

1. OK: GO TO  6 .
2. NG: GO TO 5.

Check the following.

• Harness connectors E5, F14
• Harness connectors E19, F33
• Harness connectors B106, B138
• Harness connectors B148, B251
• Harness for open or short between "fuel level sensor unit and fuel pump" and ECM.
• Harness for open or short between "fuel level sensor unit and fuel pump" and TCM.
  1. Repair open circuit or short to ground or short to power in harness or connector.

Refer to COMPONENT INSPECTION  .

OK or NG 

1. OK: GO TO 7.
2. NG: Replace fuel level sensor unit.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

1. INSPECTION END