D04 ENGINE NOT RUNNING SMOOTHLY - Alfa - 156 - eLearn

3233017 - D04 ENGINE NOT RUNNING SMOOTHLY

The engine does not run smoothly in all conditions (load, speed, etc.). This problem is accompanied by noise and vibrations coming from the engine.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check, in order: the condition of the air intake circuit that there are no faults in the air filter whether the diesel pipes are leaking the accelerator pedal travel that there is no water, petrol, paraffin or dirt in the fuel tank and filter that there are no obstructions in the exhaust system	Continue to Step 1	Fault in air intake circuit	Repair the air intake circuit
			Air filter blocked	Replace the filter element
			Leak from diesel pipes	stop the leak
			Accelerator pedal travel incomplete	Eliminate the cause of the problem
			Presence of water, petrol, paraffin or dirt detected	Clean the tank and pipes and replace the filter element
			Obstruction in the exhaust system	Replace the damaged system component
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment to the diagnostic socket. Check: for errors in the control unit parameter plausibiilty	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	unreliable parameters	Continue following the instructions for the diagnostic equipment
2	CHECK EGR AND ADJUST TURBOCHARGER	All OK	Problems met	Operation
	Keep the diagnostic equipment connected to the diagnostic socket.Carry out active diagnosis of EGR solenoid valveCarry out active diagnosis of the turbocharger regulator solenoid valve Check the operation of the variable geometry control actuator by carrying out the test See Test 1064BC Variable geometry turbocharger actuator leakage test	Continue to Step 3	EGR solenoid valve not working	Check the continuity of the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT and if necessary replace the solenoid Op. 1080C74 Restore the condition of the filter, the pipes and the heater device
			Turbocharger solenoid valve not working	Check the continuity of the wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT and if necessary replace the solenoid Op. 1064A28
			Actuator does not work correctly	Check the condition of the vacuum circuit and, if necessary, replace the damaged components
3	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: for errors in the control unit plausibility of all the parameters	Continue to Step 4	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
			unreliable parameters	Continue following the instructions for the diagnostic equipment
			Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector.
4	CHECK ON TURBOCHARGER	All OK	Problems met	Operation
	Check the operation of the turbocharger as described in the Test See Test 1064BA Check turbo pressure control solenoid (Pierburg) efficiency	Continue to Step 5	Turbocharger faulty	Replace the turbocharger unit
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists: control unit faulty	Replace control unit Op. 1060G80