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

125000493 - D01 ENGINE NOT RUNNING SMOOTHLY / (HESISTANT)

There is a (prolonged) fall in performance (flat spots) during acceleration

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
	First, check: status of spark plugs and leads; the condition of the air intake circuit	Move on to Step	Spark plugs dirty or damaged	Replace the spark plugs Op. Op. 5510D10 SPARK PLUGS - R+R
			Spark plug leads damaged	Replace spark plug leads
			Air intake circuit faulty	Eliminate the fault
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step 2	"Fuel system" error detected	Proceed as instructed in the TABLE See table Z50 MIXTURE STRENGTH ERROR
			Another error detected in the control unit	Continue following the instructions for the diagnostic equipment
			Parameter not consistent	Continue following the instructions for the diagnostic equipment
2	ROAD TEST USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Carry out a road test reproducing the conditions in which the fault occurs, keeping the diagnostic equipment connected. Check: that there are no faults in the engine management control unit; parameter plausibility	Move on to Step 3	The sudden onset of an error in the control unit is detected	Continue following the instructions for the diagnostic equipment
		Move on to Step 3	Parameter not consistent	Continue following the instructions for the diagnostic equipment
3	CHECK USING THE EXAMINER	All OK	Problems encountered	Operation
	Carry out active diagnosis of the variable valve timing and check that it is working properly	Move on to Step 4	Variable valve timing interrupted	Replace variable valve timing
4	VARIABLE VALVE TIMING OPERATING CHECK	All OK	Problems encountered	Operation
	Carry out a road test to ensure the vvt operates as requiredCheck the operation of the vvt (hydraulic actuator) by carrying out Test 1056OA See Test 1056 PETROL INJECTION SYSTEM	Move on to Step 5	Variable valve timing defective	Replace the variable valve timing
			Variable valve timing wiring interrupted	Restore wiring
			Variable valve timing (hydraulic actuator) defective	Restore to operation
5	FUEL PRESSURE CHECK	All OK	Problems encountered	Operation
	Carry out a road test, reproducing the conditions in which the fault occurs.Check fuel supply pressure by carrying out Test 1056BY See Test 1056 PETROL INJECTION SYSTEM	Move on to Step 6	Pressure not correct: obstructions in the fuel supply pipe	Remove the obstructions in the fuel pipe, replace it if necessary Op. 1040B30 TUBAZIONE DI MANDATA COMBUSTIBILE (UNICA) - S.R.
			Pressure not correct: tank not sufficiently ventilated	Restore the tank ventilation
			Pressure not correct: fuel pump electric circuit interrupted	Restore fuel pump electric circuit See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			Pressure not correct: petrol pump damaged	Replace the petrol pump assembly Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R
6	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit defective	Replace the control unit Op. 1056B82 CENTRALINA (UNICA) DELL''IMPIANTO INIEZIONE/ACCENSIONE - S.R.