Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
   Fig 1: Checking 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.
Fig 2: Disconnecting "Fuel Level Sensor Unit Fuel Pump" Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
   • Voltage: Approximately 5V 
   Fig 3: Checking Voltage Between "Fuel Level Sensor Unit Fuel Pump" Terminal 4 & Ground

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

OK or NG

• OK: GO TO  4.
• 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"

• : 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 .
   • Continuity should exist. 
5. 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 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.

• : 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