Diagnostic Procedure

1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
3. Turn ignition switch ON.
   Fig 1: 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 2 and ground with CONSULT-II or tester.

   Voltage: Battery voltage 

OK or NG

1. OK : GO TO  3.
2. NG : GO TO 2.
   Fig 2: Checking Voltage Between Terminal 2 And Ground

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

Check the following.

• Harness connectors M12, B2
• Harness for open or short between combination meter and "fuel level sensor unit and fuel pump"

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

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

1. OK : GO TO  5.
2. NG : GO TO 4.

Check the following.

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

1. : Repair open circuit or short to power in harness or connectors.

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 69 and "fuel level sensor unit and fuel pump" terminal 2.

   Refer to Wiring Diagram .

   Continuity should exist. 

3. Also check harness for short to ground or short to power.

OK or NG

1. OK : GO TO  7.
2. NG : GO TO 6.

Check the following.

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

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

Refer to "FUEL LEVEL SENSOR UNIT CHECK ".

OK or NG

1. OK : GO TO 8.
2. NG : Replace fuel level sensor unit.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. : INSPECTION END