Engine coolant overheating warning light not working

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Instrument panel › Engine coolant overheating warning light not working

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Fault diagnosisEngine coolant overheating warning light not working

ENGINE COOLANT OVERHEATING WARNING LIGHT NOT WORKING

With the ignition on, the engine coolant temperature gauge on the instrument panel is not working

the engine temperature and the engine temperature sensor signal is made available by the "engine management node" via the C-CAN; the "body computer node" makes the message available on the B-CAN via the gateway and then to the instrument panel.

0	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the engine control warning light does not come on with the engine started	Move on to Step 2	Warning light on	Move on to Step 1
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic socket. Check for faults in the Engine Control Node	Move on to Step 2	Presence of faults	Continue as described by the diagnostic equipment
2	CHECK FOR ENGINE CONTROL FAULTS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	The panel indicates errors not detected by the engine control unit: proceed as instructed in the See table K101 MIL WARNING LIGHT STAYS ON (ENGINE STARTS)	End of diagnosis
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner connected to the diagnostic socket, check the operation of the warning light on the instrument panel by means of active diagnosis	Move on to Step 4	1. The warning light does not come on for the serial line with the NQS interrupted	1. Move on to Step 4
		Move on to Step 4	2. Instrument power supply interrupted	2. Move on to Step 5
4	SERIAL LINE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity/insulation of the serial line between the auxiliary gauge and the instrument panel by peforming the Test See Test 5560BW CHECK AUXILIARY INSTRUMENTS	Move on to Step 5	Serial line broken	Restore the serial line
5	SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the auxiliary gauge is correctly supplied by conducting the Test See Test 5560BW CHECK AUXILIARY INSTRUMENTS	Move on to Step 6	1. Power supply interrupted	1. Restore power supply
		Move on to Step 6	2. Auxiliary instrument defective	2. Replace the gauge Op. 5560C51 COMBINED ANALOGUE CONTROL PANEL - R+R OR REPLACE
6	ELECTRICAL CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity/insulation of the cable between the engine coolant temperature sensor, engine control unit, Body Computer and instrument panel See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	Move on to Step 7	Connections broken/not insulated	Restore cable continuity/insulation
7	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R

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