Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
   Fig 1: Identifying Ground Screws On Body

   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 Level Sensor 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 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 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