Fuel Gauge

Testing fuel gauge

Preceding work:
- Partition panel between fuel tank and trunk removed.
- Fuel gauge sensor removed.





Testing fuel gauge sensor
- Connect multimeter to terminals G and 31 and measure resistance.








Testing reserve warning contact
- Connect multimeter to terminals W and 31 and measure resistance.
Specification: Approx. 0 ohms in installed position.
Specification: Infinite ohms turned 180°.

Note: The reserve warning lamp lights up when the ignition is switched on (check function). As soon as the engine is running, it goes out provided the fuel tank contains more than the reserve quantity. The reserve warning lamp lights up with a weak light for the check function, and with a brighter light for reserve warning.


Testing wiring harness



- Measure resistance at contact 3 connector of fuel gauge sensor and vehicle ground.
Specification: Approx. 0 ohms, if test value is infinite ohms ground cable has open circuit.
- Install fuel gauge sensor.



- Measure resistance at terminal G and 31. The reading depends on the contents of the fuel tank.
- Plug in connector at fuel gauge sensor.
- Remove instrument cluster. Service and Repair
- Connect multimeter to contacts 1 and 3 to measure resistance.



- Specificating is the reading measured and noted at terminal G and terminal 31 of fuel gauge sensor; minor variation possible due to line length.
- Measured value higher or infinite ohms, poor contact at wiring harness connectors (at instrument cluster, at main wiring harness, tail lamp harness or at fuel gauge sensor), cold solder point or cable has open circuit.
- Replace gauge if no fault detected during tests.
- Install instrument cluster. Service and Repair

Test Data For Fuel Gauge Sensor:

Commercially available tester
Multimeter e.g. Sun DMM-5