Fuel Level Sensor Signal Circuit

FUEL LEVEL SENSOR SIGNAL CIRCUIT

Description

The fuel level sensor unit and fuel pump (main) and the fuel level sensor unit (sub) detect the fuel level in the fuel tank and transmit the fuel gauge signal to the unified meter and A/C amp.


Component Function Check


1. CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL

Select the "Data Monitor" for the "METER/M&A" and compare the "FUEL METER" monitor value with the fuel gauge reading on the combination meter.





Does monitor value match fuel gauge reading?
YES- INSPECTION END
NO- Replace combination meter.


Diagnosis Procedure


1. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL

1.Turn ignition switch ON.
2.Check voltage between unified meter and A/C amp. harness connector and ground.





Does it match fuel gauge reading?
YES- GO TO 2.
NO- Replace unified meter and A/C amp.

2. CHECK FUEL LEVEL SENSOR (SUB) CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect unified meter and A/C amp. connector and fuel level sensor unit (sub) connector.
3.Check continuity between unified meter and A/C amp. harness connector and fuel level sensor unit (sub)
harness connector.





4.Check continuity between unified meter and A/C amp. harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.

3. CHECK FUEL LEVEL SENSOR (MAIN-SUB) CIRCUIT

1.Disconnect fuel level sensor unit and fuel pump (main) connector.
2.Check continuity between fuel level sensor unit (sub) harness connector and fuel level sensor unit and fuel pump (main) harness connector.





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





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK FUEL LEVEL SENSOR (MAIN) CIRCUIT

Check continuity between fuel level sensor unit and fuel pump (main) harness connector and unified meter and A/C amp. harness connector.





Is the inspection result normal?
YES- INSPECTION END
NO- Repair harness or connector.


Component Inspection


1. REMOVE FUEL LEVEL SENSOR UNIT

Remove the fuel level sensor unit. Refer to "Removal and Installation" Removal and Installation.
- GO TO 2.

2. CHECK FUEL LEVEL SENSOR UNIT AND FUEL PUMP (MAIN)






Check the resistance between fuel level sensor unit and fuel pump (main).





Standard float position





Is the inspection result normal?
YES- GO TO 3.
NO- Replace fuel level sensor unit and fuel pump (main).

3. CHECK FUEL LEVEL SENSOR UNIT (SUB)






Inspect the resistance of fuel level sensor unit (sub).





Standard float position





Is the inspection result normal?
YES- INSPECTION END
NO- Replace fuel level sensor unit (sub).