Diagnostic Procedure

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

   Refer to "GROUND INSPECTION ".

   Fig 1: Identifying E24, E15 Body Ground And F9, F16 Engine Ground Screws

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

OK or NG 

OK >> GO TO 2.

NG >> Repair or replace ground connections.

1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
   • <=: Vehicle front
3. Turn ignition switch ON.
   Fig 2: Identifying 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.

   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 E8, F8
• Harness connectors M69, E7
• Harness connectors B102, M13
• Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

  >> Repair open circuit or short to ground 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 combination meter terminal 24. Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. 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 B102, M13
• Harness for open or short between "fuel level sensor unit and fuel pump" and ground.

  >> Repair open circuit or short to ground or short to power in harness or connectors.

Refer to, "COMPONENT INSPECTION ".

OK or NG 

OK >> GO TO 7.

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

Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

>> INSPECTION END