Fuel Level Sensor Signal Inspection

COMBINATION METERS


Fuel Level Sensor Signal Inspection


Symptom:
- Fuel gauge indication is malfunction.
- Low-fuel warning lamp indication is irregular.

NOTE:
The following symptoms are not malfunction.

Fuel level sensor unit
- Depending on vehicle position or driving circumstance, the fuel level in the tank varies, and the pointer may fluctuate.

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 UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Select "METER/M&A" on CONSULT-III.
2. Using "FUEL METER" on "Data Monitor", compare the value of "Data Monitor" to the indication of fuel gauge of combination meter.





OK or NG
OK - GO TO 2.
NG - Replace combination meter.
2.CHECK FUEL LEVEL SENSOR
1. Turn ignition switch OFF.
2. Check components. Electrical Component Inspection.
OK or NG
OK - GO TO 3.
NG - Replace fuel level sensor unit.
3.CHECK FUEL LEVEL SENSOR (SUB) CIRCUIT
1. Disconnect unified meter and A/C amp. connector and fuel level sensor unit (sub) connector.





2. Check continuity between unified meter and A/C amp. harness connector (A) and fuel level sensor unit (sub) harness connector
(B).





3. Check continuity between unified meter and A/C amp. harness connector (A) and ground.





OK or NG
OK - GO TO 4.
NG - Repair harness or connector.
4.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 (A) and fuel level sensor unit and fuel pump (main) harness connector (B).





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





OK or NG
OK - GO TO 5.
NG - Repair harness or connector.
5.CHECK FUEL LEVEL SENSOR (MAIN) CIRCUIT





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





OK or NG
OK - GO TO 6.
NG - Repair harness or connector.
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
OK - Replace unified meter and A/C amp.
NG - Install the fuel level sensor unit properly.