D003 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION) - Alfa - 159 - eLearn

939003567 - D003 ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)

During driving, the engine misses and loses performance

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: battery earth correctly fixed See E1010 SUPPLY condition of the air intake circuit the condition of the spark plugs quality of the fuel check engine wiring earths	Continue to Step 1	Earth fastening not correct	Restore correct fixing
			Air intake circuit fault	Restore the correct operation of the intake circuit
			Spark plugs not the type recommended by the manufacturer	Replace the spark plugs
			Impurities in the fuel	Clean the fuel tank
			Earths faulty	Restore correct fixing
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check: for errors in the control unit plausibility of all the parameters	Continue to Step 2	Error detected	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	Inconsistent parameter	Anaylze the factors that have caused this inconsistency
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; the plausibility of the parameters, in particular: rail pressure - rail pressure setting, injection times, revs (graphic acquisition of signal), engine temperature	Continue to Step 3	Error detected	Continue following the instructions for the diagnostic equipment
		Continue to Step 3	Inconsistent parameter	Anaylze the factors that have caused this inconsistency
3	LOW PRESSURE CIRCUIT CHECK	All OK	Problems met	Operation
	Check that the fuel pressure is correct	Continue to Step 4	Incorrect pressure: obstructions in the fuel delivery pipe	Remove the obstructions in the fuel pipe, and if necessary replace it
			Pressure not correct: tank insufficiently ventilated	Restsore the tank ventilation
			Pressure not correct: petrol pump damaged or not correctly supplied	Replace fuel pump assembly Op. 1040A70
4	RAIL PRESSURE SENSOR CHECK	All OK	Problems met	Operation
	Check the operation of the rail sensor	Continue to Step 5	Pressure sensor faulty	Replace sensor.
5	PRESSURE REGULATOR CHECK	All OK	Problems met	Operation
	Check that the voltage regulator is working	Continue to Step 6	Pressure regulator faulty	Replace the pressure regulator
6	HIGH PRESSURE PUMP CHECK	All OK	Problems met	Operation
	Check the operation of the high pressure pump	Continue to Step 7	High pressure pump faulty	Replace high pressure pump
7	CHECK ON INJECTORS	All OK	Problems met	Operation
	Check the continuity/insulation of the injector wiring; in particular, make sure that the injector operating signal is present See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 8	No signal, wiring broken	Renew the wiring See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 8	No signal, wiring not broken	Replace engine management control unit