22 · Diagnostics

Engine not running smoothly

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Engine › Engine not running smoothly

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Fault diagnosisEngine not running smoothly

ENGINE NOT RUNNING SMOOTHLY

2.0 JTS

There are decreases in performance during acceleration

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 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 Op. Op. 1048A14 AIR CLEANER FILTERING ELEMENT - REPLACE.
			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 Op. Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE
			Obstruction in the exhaust system	Replace the system damaged component
1	CHECK 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 The plausibiilty of the parameters.	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
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Carry out active diagnosis of EGR solenoid valve. Carry out the active diagnosis of the turbocharger regulator solenoid valve. Check the operation of the variable geometry control actuator by carrying out the	Continue to Step 3	EGR solenoid valve not working	Check the continuity of the wiring See See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT , if necessary replace the solenoid Op. Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R
			Turbocharger solenoid valve not working	Check the continuity of the wiring See See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT if necessary replace the solenoid Op. 1064B42
			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, reproducting the conditions in which the fault arises, keeping the diagnostic socket connected Check: For errors in the control unit; The plausibiilty of 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 turbocharger operation as described in the	Continue to Step 5	Turbocharger faulty	Replace the turbocharger unit Op. Op. 1064A24 VARIABLE GEOMETRY TURBOCHARGER EXHAUST MANIFOLD ASSEMBLY SLEEVELEADING TO EXHAUST PIPE R R
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. Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R

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