D03 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION) - Alfa - 156 - eLearn

3233016 - D03 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)

The engine does not run smoothly in all conditions (load, speed, etc.).In particular, there are brief, but intense 'flat spots'

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check, in order: the condition of the air intake circuit that there are no faults in the air filter whether the diesel pipes are leaking that there is no water, petrol, paraffin or dirt in the fuel tank and filter that the battery earth is correctly fixed that there are no obstructions in the exhaust system	Continue to Step 1	Fault in air intake circuit	Repair the air intake circuit
			Air filter blocked	Replace the filter element
			Leak from diesel pipes	stop the leak
			Presence of water, petrol, parffin or dirt detected.	Clean the tank and pipes and replace the filter element
			Loose battery earth terminal	Restore the correct fixing of the earth cable
			Obstruction in the exhaust system	Replace the damaged system component
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment to the diagnostic socket. Check: that there are no errors in the control unit plausibility of all the parameters	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	unreliable parameters	Continue following the instructions for the diagnostic equipment
2	ROAD TEST WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Road test the vehicle, reproducing the conditions in which the fault arises, keeping the diagnostic equipment connected. Check: that there are no errors in the control unit plausibility of all the parameters	Continue to Step 3	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
			unreliable parameters	Continue following the instructions for the diagnostic equipment
			Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector.
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace control unit Op. 1060G80