D01 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT) - Alfa - 147 - eLearn

3022579 - D01 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT)

There are decreases in performance, possibly prolonged, during acceleration

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: the state of the spark plugs and leads; the condition of the air intake circuit	Continue to Step 1	Spark plugs dirty or damaged	Replace the spark plugs Op. 5510D10
			Spark plug leads damaged	Replace the spark plug leads
			Air intake circuit fault	Eliminate the problem
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	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; plausibility of all the parameters	Continue to Step 2	'Supply system' error detected	See table Z50 MIXTURE STRENGTH ERROR
			Another error dectected in the control unit	Continue following the instructions for the diagnostic equipment
			Inconsistent parameter	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 faults in the engine management control unit; plausibility of all the parameters	Continue to Step 3	Error arises suddenly in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 3	Inconsistent parameter	Continue following the instructions for the diagnostic equipment
3	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Carry out a road test, reproducing the conditions in which the fault arises.Check the fuel supply pressure Op. 0510C10	Continue to Step 4	Incorrect pressure: obstructions in the fuel delivery pipe	Remove the obstructions in the fuel pipe; if necessary replace it Op. 1040B30
			Pressure not correct: tank insufficiently ventilated	Restsore the tank ventilation
			Pressure not correct: fuel pump electrical circuit broken	Repair fuel pump electrical circuit See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			Pressure incorrect: fuel pump damaged	Replace fuel pump assembly Op. 1040A70
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists: control unit defective	Replace control unit Op. 1056B82 Search for the fault starting from another symptom'