B1720

Read the instructions below then start the fault diagnostic procedure.

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

B1720

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.