16 · Diagnostics

K01 Rev counter not working

Fault diagnosisK01 Rev counter not working

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

Step	Test procedure	Result	Action
1	CHECK WITH DIAGNOSTIC EQUIPMENT Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check 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	OK	Move onto step 2
1		Signal not sent	Restore the connection between the rev counter and the engine control unitWiring diagram E4040 WARNING LIGHTS CHECK End of diagnosis
2	REV COUNTER ELECTRICAL CIRCUIT CHECK Check, in order: ignition-operated service fuse rev counter supply rev counter earth (Wiring diagram E4020 TACHOMETER ).	OK	Move onto step 3
		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
3	CHECK REV COUNTER Check that the rev counter is working see DESCRIPTION AND OPERATION: 5560 Instruments (see 5560F)	OK	Move onto step 4
3		Instrument not working	Replace the rev counter Op. 5560B03 End of diagnosis
4	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
4		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 1997 Alfa Romeo 156

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