D01 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT) - Alfa - 156 - eLearn

3233014 - 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
	First check: the condition of the air intake circuit	Continue to Step 1	Air intake circuit check	Restore correct operation of the intake circuit
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 the plausibiilty of the parameters	Continue to Step 2	'Fuel system' error appears	See table Z50 MIXTURE STRENGTH ERROR
			Another error dectected in the control unit	Continue following the instructions for the diagnostic equipment
			Incoherent 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 under which the fault arises, keeping the diagnostic equipment connected Check:: that there are no faults in the engine management control unit the plausibiilty of 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	Incoherent parameter	Continue following the instructions for the diagnostic equipment and analyse the factors that could cause these inconsistencies.
3	CHECKING 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
			Incorrect pressure: tank not sufficiently ventilated	Restore tank ventilation
			Pressure incorrect: fuel pump damaged	Replace fuel pump assembly Op. 1040A70
4	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit defective	Replace engine management control unit Op. 1056B82