Contents

		Test results
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Check the following, in order: - Correct engine oil level - Possible oil leaks - Correct coolant level - Possible coolant leaks - Radiator blocked	Go to Step 1	Engine oil level not correct	Top up to the correct oil level.
			Oil leaks	Eliminate leaks
			Coolant level not correct	Top up to the correct level
			Coolant leaks	Eliminate leaks
			Radiator blocked	Descale radiator
1		All OK	Problems encountered	Operation
	CHECK USING DIAGNOSTIC EQUIPMENT Connect the Examiner diagnostic equipment to the engine control unit. Check: - that there are no errors in the control unit; - parameter plausibility.	Move on to Step 2 for versions with air conditioning only Move on to Step 3 for all versions	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
			Parameters not plausible	Continue following the instructions on the diagnostic equipment
2	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the climate control system control unit. Check: - that there are no errors in the control unit; - parameter plausibility.	Go to Step 3	Onset of error in control unit detected	Continue following the instructions on the diagnostic equipment
		Go to Step 3	Parameters not plausible	Continue following the instructions on the diagnostic equipment
3	ENGINE COOLANT TEMPERATURE SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the engine coolant temperature sensor is working properly by carrying out the See Test 1056BC Engine coolant temperature sensor operation check	Go to Step 4	Sensor defective	Replace the sensor Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
		Go to Step 4	Sensor wiring connection irregular	Restore the correct connection
4	WIRING CHECK	All OK	Problems encountered	Operation
	Check the continuity of the connections between the engine management control unit and fuse control unit Check that the fan control relays are working properly See E5020 ENGINE COOLING	Go to Step 5	Wiring defective	Restore the correct wiring.
		Go to Step 5	Relays defective	Replace the relays
5	THERMOSTAT CHECK	All OK	Problems encountered	Operation
	Check that the thermostat is working properly	Go to Step 6	Thermostat defective	Replace the thermostat Op. 1088C40 THERMOSTAT- R + R
6	ENGINE CONTROL UNIT CHECK	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly	End of diagnosis	Engine management control unit defective	Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R