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 combination meter.




Component Function Check
1.CHECK COMBINATION METER INPUT 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 COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between combination meter harness connector and ground.





Does it match fuel gauge reading?
YES - GO TO 2.
NO - Replace the combination meter.
2.CHECK FUEL LEVEL SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and fuel level sensor unit (sub) connector.
3. Check continuity between combination meter harness connector and fuel level sensor unit (sub) harness connector.





4. Check continuity between combination meter harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connector.
3.CHECK FUEL LEVEL SENSOR UNIT (MAIN-SUB) CIRCUIT
1. Disconnect fuel level sensor unit (main) connector.
2. Check for continuity between the fuel level sensor unit (sub) harness connector and the fuel level sensor unit (main) harness connector.





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





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK FUEL LEVEL SENSOR GROUND CIRCUIT
Check continuity between fuel level sensor unit (main) harness connector and combination meter 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. 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).










Is inspection result OK?
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).










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