K07 Odometer fails to switch to outside temperature (Automatic air conditioner)

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Instruments › K07 Odometer fails to switch to outside temperature (Automatic air conditioner)

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Fault diagnosisK07 Odometer fails to switch to outside temperature (Automatic air conditioner)

K07 Odometer fails to switch to outside temperature (Automatic air conditioner)

With the ignition key in the ON position, the speedometer works properly, but does not manage to switch to the outside temperature reading.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Check the operation of the speedometer	OK	Move onto step 1
0		The speedometer is not working at all	Move onto step (see K05)
1	ZEROING BUTTON CHECK Check the operation of the speedometer zeroing button (Wiring diagram E4021 SPEEDOMETER ).	OK	Move onto step 2
1		Zeroing button faulty	Renew or replace the zeroing button Op. 5540C18 End of diagnosis
2	OUTSIDE TEMPERATURE SIGNAL ELECTRICAL CIRCUIT CHECK Check, in order: the connection between the speedometer and the climate control unit the connection between the speedometer and the zeroing button the trip meter zeroing button earth (Wiring diagram E4021 SPEEDOMETER ).	OK	Move onto step 3
2		Connections broken	Restore the connections End of diagnosis
3	CHECK WITH DIAGNOSTIC EQUIPMENT Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check that there are no faults in the climate control unit, in particular check the outside temperature sensor and the signal	OK	Move onto step 4
		Signal not sent	Check and, if necessary, replace the outside temperature sensor Op. 5010D12 End of diagnosis
		Climate control unit faulty	Check and, if necessary, replace the climate control unitOp. 5040D18 End of diagnosis
4	SPEEDOMETER CHECK Check the operation of the speedometer, in particular the outside temperature display function: see DESCRIPTION AND OPERATION: 5560 Instruments (see 5560F)	OK	Move onto step 5
4		Instrument not working	Replace the speedometer Op. 5560B02 End of diagnosis
5	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
5		Fault persists	Incorrect selection of diagnostic procedure

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Parts & tools for this job For 1997 Alfa Romeo 156

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