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Alfa Romeo 156 Factory Service Manual (1997-2002)16 · Fault diagnosis
16 · Diagnostics

K20 Fuel level gauge not working

Make
Alfa Romeo
Model
156 Factory Service Manual
Year
1997–2002
Section
Instruments › K20 Fuel level gauge not working
Fault diagnosisK20 Fuel level gauge not working

K20 Fuel level gauge not working

With the ignition key in the ON position, the fuel gauge indicator is not working properly (it indicates a different level from what is actually in the tank)

StepTest procedureResultAction
1CHECKING CENTRAL INSTRUMENT ELECTRICAL CIRCUIT

Check:

  • Connection between the fuel gauge and the central instrument
  • service fuse
  • ignition-operated service fuse
  • central instrument power supply
  • central instrument earth

(Wiring diagram E4023 AUXILIARY INSTRUMENT(DASHBOARD CENTRE) ).

OK

Move onto step 2

Component defective
  • Replace the component involved (if a fuse is involved, search for the cause of the problem)

End of diagnosis

Connections broken
  • Restore the connections (

End of diagnosis

2FUEL GAUGE CHECK

Check the operation of the fuel gauge.

OK

Move onto step 3

Sender unit defective
  • Replace the sender unit inside the fuel pump Op. 1040A70

End of diagnosis

3CHECKING CENTRAL INSTRUMENT

Check the central instrument is working properly, particularly the fuel level signal check device see DESCRIPTION AND OPERATION: 5560 Instruments (see 5560F)

OK

Move onto step 4

Device not working

End of diagnosis

4CHECK CORRECT OPERATION

Check that the fault is no longer present

OK

End of diagnosis

Fault persists

Incorrect selection of diagnostic procedure

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