Diagnostic Procedure

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

   Refer to "GROUND INSPECTION ".

   Fig 1: Loosening And Retightening Ground Screws

   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.
2. Turn ignition switch ON.
   Fig 2: Disconnecting Fuel Level Sensor Unit And 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-II or tester.

   Voltage: Approximately 5V 

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 B2, M12
• Harness connectors M71, F59
• Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

• : Repair open circuit or short to power in harness or connector.

1. Turn ignition switch OFF.
2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ground.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. Also check harness for short to power.

OK or NG 

• OK: GO TO  6.
• NG: GO TO 5.

Check the following.

• Harness connectors B2, M12
• Harness connectors M70, F58
• Harness for open or short between "fuel level sensor unit and fuel pump" and ground

• : Repair open circuit 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.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

• : INSPECTION END