D31 High engine temperature without fan

Fault diagnosisD31 High engine temperature without fan

The reading on the instrument in the panel shows a high engine coolant temperature and the cooling fan does not come on

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Check the condition and the correct operation of the engine cooling fan(s) NOTE: this check can be carried out by connecting the diagnostic equipment (Examiner or other instruments) to the diagnostic socket and carrying out the active diagnosis of the engine cooling fans:(in the engine management control unit ambient)	OK	Move onto step 2
0		Fan(s) faulty	Move onto step 1
1	FAN OPERATING CIRCUIT CHECK Check, in order: fan fuses fan engagment relays fan resistances connection between management control unit and fan relays connection between fan relays and fans (Wiring diagram E5020 ENGINE COOLING ).	OK	Move onto step 2
		Connections not correct	Restore the connections End of diagnosis
		Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem) End of diagnosis
		Fan resistances faulty NOTE in that case the fan is not working at two different speeds	Replace the fan resistances Op. 1088E20 End of diagnosis
		Fan(s) faulty	Replace fan(s) Op. 1088E11 End of diagnosis
2	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
2		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 1997 Alfa Romeo 156

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