Low-Fuel Warning Lamp

Depending on vehicle position or driving circumstance, the fuel in the tank flows and the warning lamp ON timing may change.

1. CHECK HARNESS CONNECTOR 

   Check combination meter and fuel level sensor unit terminals (meter-side, unit-side, harness-side) for looseness or bent terminals.

   OK or NG

   1. OK: GO TO 2.
   2. NG: Repair terminal or connector.
2. CHECK COMBINATION METER CIRCUIT 
   1. Disconnect combination meter connector and fuel level sensor unit (sub) connector.
   2. Check continuity between combination meter harness connector M19 terminal 17 (W/B) and fuel level sensor unit (sub) harness connector B28 terminal 1 (W/B).

      Continuity should exist. 

   3. Check continuity between combination meter harness connector M19 terminal 17 (W/B) and ground.

      Continuity should not exist. 

      Fig 1: Checking Continuity Between Combination Meter Harness Connector M19 Terminal 17 (W/B) And Fuel Level Sensor Unit (Sub) Harness Connector B28 Terminal 1 (W/B)

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

   OK or NG

   1. OK: GO TO 3.
   2. NG: Repair harness or connector.
3. CHECK FUEL LEVEL SENSOR CIRCUIT 
   1. Disconnect fuel level sensor unit and fuel pump (main) connector.
   2. Check continuity between fuel level sensor unit (sub) harness connector B28 terminal 2 (Y) and fuel level sensor unit and fuel pump (main) harness connector B27 terminal 2 (Y).

      Continuity should exist. 

   3. Check continuity between fuel level sensor unit (sub) harness connector B28 terminal 2 (Y) and ground.

      Continuity should not exist. 

      Fig 2: Checking Continuity Between Fuel Level Sensor Unit (Sub) Harness Connector Terminal And Ground

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

   OK or NG

   1. OK: GO TO 4.
   2. NG: Repair harness or connector.
4. CHECK GROUND CIRCUIT 

   Check continuity between fuel level sensor unit and fuel pump (main) harness connector B27 terminal 5 (B) and ground.

   Continuity should exist. 

   Fig 3: Checking Continuity Between Fuel Level Sensor Unit And Fuel Pump (Main) Harness Connector B27 Terminal 5 (B) And Ground

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

   OK or NG

   1. OK: GO TO 5.
   2. NG: Repair harness or connector.
5. CHECK FUEL LEVEL SENSOR 

   Check fuel level sensor units. Refer to FUEL LEVEL SENSOR UNIT CHECK .

   OK or NG

   1. OK: GO TO 6.
   2. NG: Replace fuel level sensor unit and fuel pump (main) or fuel level sensor unit (sub).
6. CHECK INSTALLATION CONDITION 

   Check fuel level sensor unit installation, and check whether the float arm interferes or binds with any of the internal components in the fuel tank.

   OK or NG

   1. OK: Replace combination meter.
   2. NG: Install fuel level sensor unit properly.