B1720

Read the instructions below then start the fault diagnostic procedure.

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

B1720

Fault symptoms

The fuel gauge shows empty.

Fuel level indicator lamp is on.

Some of the trip computer's functions are affected.

Condition

Open circuit/Short circuit Ground/Shorting to B+ on one of the pins connected to the tank sensor.

Diagnostic help

The current tank information can be read with the diagnostic tool.

The tank gauge can be activated with the diagnostic tool.

The value is not sent to the bus when activated.

Checking 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.