K01 REV COUNTER NOT WORKING - Alfa - 156 - eLearn

With the ignition key in the ON position, the rev counter does not work or it works irregularly

1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck that there are no faults in the engine management control unit: in particular, check that the rev counter signal is sent correctly by the control unit	Continue to Step 2	Signal not sent	Restore the connection between the rev counter and the engine control unit See E4040 INSTRUMENT WARNING LIGHTS CHECK
2	REV COUNTER ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: ignition-operated service fuse rev counter supply rev counter earth ( See E4020 REV COUNTER INSTRUMENT ).	Continue to Step 3	Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 3	Connections broken	Restore the connections
3	CHECK REV COUNTER	All OK	Problems met	Operation
	Check that the rev counter is working see DESCRIPTION AND OPERATION: 5560 INSTRUMENT PANEL	Continue to Step 4	Instrument not working	Replace the rev counter Op. 5560B03
4	CHECK CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'