D02 ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER) - Alfa - 156 - eLearn

3233015 - D02 ENGINE NOT RUNNING SMOOTHLY / (LOSING POWER)

Under conditions of constant load and speed, there are intermittent decreases in performance, even prolonged

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: that there is no water, other fluid or dirt in the fuel tank the state of the spark plugs and leads the condition of the air intake circuit	Continue to Step 1	Presence of dirt in the fuel tank	Clean the fuel tank Op. 1040A10
			Spark plugs dirty or damaged	Clean or replace the spark plugs Op. 5510D10
			Spark plug leads damaged	Replace the spark plug leads Op. 5510D14
			Air intake circuit component damaged	Replace the component (see Assembly 1048A)
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 plausibility of all the parameters.	Continue to Step 2	An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment
		Continue to Step 2	Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector ( See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING ).
2	CHECK ON INJECTORS	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	Continue to Step 3	Injector connections faulty	Restore the connection of the injectors with the control unit, ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )
		Continue to Step 3	Injectors faulty	Replace the injectors Op. 1056B70
3	CHECK FUEL PUMP	All OK	Problems met	Operation
1.8 TS [d] 2.5 V6	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis for the fuel pump relay	Continue to Step 4	Fuel pump relay faulty	Restore the connections between the: fuel pump relay fuel pump engine management unit inertia switch ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT )
1.8 TS [d] 2.5 V6		Continue to Step 4	Fuel pump faulty	Replace the fuel pump Op. 1056B70
1.6 TS	Check, in order: fuel pump relay connection between relay, fuel pump and engine management control unit connection between fuel pump and inertia switch operation of fuel pump ( See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT ).	Continue to Step 4	Connections not correct	Restore the connections
1.6 TS		Continue to Step 4	Fuel pump faulty	Replace the fuel pump assembly Op. 1056B70
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'