K26 Engine coolant temperature gauge not working

Fault diagnosisK26 Engine coolant temperature gauge not working

With the ignition turned ON, the engine coolant temperature warning light does not come on when the engine is hot.

Step	Test procedure	Result	Action
1	CHECK HIGH TEMPERATURE SWITCH/SIGNAL Check: operation of the engine coolant temperature sensor connection betwen sender unit and central instrument (Wiring diagram E4023 AUXILIARY INSTRUMENT(DASHBOARD CENTRE) ).	OK	Move onto step 2
		Faulty switch	Replace switchOp. 1088E35 End of diagnosis
		Connections broken	Restore the connections ( End of diagnosis
1	CHECK HIGH TEMPERATURE SWITCH/SIGNAL Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Carry out active diagnosis of the maximum engine coolant temperature warning light (through the engine management control unit)	OK	Move onto step 2
		Signal not present	Check the engine temperature sender unit and replace if necessaryOp. 1060G14 End of diagnosis
		Connections broken	Restore connection between switch and central instrument End of diagnosis
2	CHECKING WARNING LIGHT Check the condition of the high engine coolant temperature warning light, located in the instrument	OK	Move onto step 3
2		Warning light faulty	Replace the warning light in the central instrument Op. 5560C51 End of diagnosis
3	CHECKING CENTRAL INSTRUMENT Checking central instrument operation: 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

Parts & tools for this job For 1997 Alfa Romeo 156

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