K25 Engine coolant fluid temperature gauge not working

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Instruments › K25 Engine coolant fluid temperature gauge not working

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Fault diagnosisK25 Engine coolant fluid temperature gauge not working

K25 Engine coolant fluid temperature gauge not working

With the ignition key in the ON position, the coolant temperature gauge indicator on the central instrument is not working properly (it indicates a different level from the true engine value)

Step	Test procedure	Result	Action
1	CHECKING CENTRAL INSTRUMENT ELECTRICAL CIRCUIT Check: connection between engine coolant temperature sender unit and 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
2	CHECKING TEMPERATURE SENDER UNIT Checking operation of engine coolant temperature sender unit	OK	Move onto step 3
2		Sender unit defective	Replace sender unit Op. 1088E24 End of diagnosis
2	CHECKING TEMPERATURE SENDER UNIT Check that the engine coolant temperature sender unit is working properly:	OK	Move onto step 3
2		Sender unit defective	Change the sender unti Op. 1088E34 End of diagnosis
3	CHECKING THE CENTRAL INSTRUMENT Check the central instrument is working properly, particularly the engine coolant temperature signal check device see DESCRIPTION AND OPERATION: 5560 Instruments (see 5560F)	OK	Move onto step 4
3		Device not working	Replace the central instrument Op. 5560C51 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

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Parts & tools for this job For 1997 Alfa Romeo 156

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