Fuel Level Sensor Signal Circuit

FUEL LEVEL SENSOR SIGNAL CIRCUIT

Description

The fuel level sensor unit and fuel pump detects the approximate fuel level in the fuel tank and transmits the fuel level signal to the combination meter.


Component Function Check


1. COMBINATION METER INPUT SIGNAL

1.Select METER/M&A on CONSULT.
2.Using FUEL METER of DATA MONITOR, compare the value of DATA MONITOR with fuel gauge pointer of combination meter.





Does the data monitor value approximately match the fuel gauge indication?
YES- Inspection End.
NO- Replace combination meter. Refer to "Removal and Installation" Service and Repair.


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Electrical Diagrams.

1. CHECK HARNESS CONNECTOR

1.Turn ignition switch OFF.
2.Check combination meter and fuel level sensor unit terminals (meter-side and harness-side) for poor connection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace terminals or connectors.

2. CHECK FUEL LEVEL SENSOR UNIT CIRCUIT

1.Disconnect combination meter harness connector M24 and fuel level sensor unit harness connector B42.
2.Check continuity between combination meter harness connector M24 and fuel level sensor unit and fuel pump harness connector B42.





3.Check continuity between fuel level sensor unit and fuel pump harness connector and ground.





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

3. CHECK FUEL LEVEL SENSOR UNIT GROUND CIRCUIT

1.Check continuity between combination meter harness connector M24 and fuel level sensor unit and fuel pump harness connector B42.





2.Check continuity between fuel level sensor unit and fuel pump harness connector and ground.





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

4. 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.
Is the inspection result normal?
YES- Inspection End.
NO- Install the fuel level sensor unit properly. Refer to "Removal and Installation" Removal And Installation.


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






Check the resistance between terminals 2 and 5.





Is inspection result normal?
YES- Inspection End.
NO- Replace fuel level sensor unit and fuel pump. Refer to
"Removal and Installation" Removal And Installation.