Main Instrument Unit

Fuel Gauge Sensor:

Fault symptoms
The fuel gauge shows tank empty
The indicator lamp for low fuel level is on.
Some of the trip computer's functions are affected.

Condition
Break/short circuit in the fuel gauge sensor circuit.

Diagnostic help
The diagnostic tool can be used to obtain the following fuel level information:
- Fuel level sensor (shows fuel remaining in the tank through measuring voltage V across the fuel gauge sensor).
- Fuel level (shows remaining fuel in the tank, unit litres).
- Fuel level, filtered (shows remaining fuel in the tank, main instrument unit's internal filtered value). The fuel gauge can also be activated with the diagnostic tool.

Check the wiring harness
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.