323001850 - D033 ELECTRIC FAN STAYS ON ALL THE TIME

The cooling fan comes on and remains on even when the engine is cold

		Test results
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check:- That there are no faults in the engine management control unit;- The plausibility of all the parameters	Move on to Step 2	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
2	FAN OPERATING CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the following, in order:- Engine temperature sensor    See Test 1060OE ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK- Fan engagement relay;- Connection between engine management control unit and fan relay;- Connection between relay and fan    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT	End of diagnosis	1. Sensor defective2. Connections not correct3. Component defective4. Engine management control unit faulty	1. Replace the temperature sensor    Op. 1060G14 ENGINE COOLANT TEMPERATURE SENSOR - R.R. 2. Repair the connections3. Replace the component involved (In the case of a fuse, find out what caused it to blow).4. Check the control unit thoroughly (using the diagnostic equipment - Examiner or other instruments) and, if necessary, replace the engine management control unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R