22 · Diagnostics

Engine not running smoothly

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Engine › Engine not running smoothly

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Fault diagnosisEngine not running smoothly

ENGINE NOT RUNNING SMOOTHLY

1.9 JTD 8v

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	Continue to Step 1	Faulty in the air intake circuit	Restore the air intake circuit
			Air filter clogged	Replace the filter element
			Leak from diesel pipes	Stop the leaks
			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
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Verify: that there are no errors in the control unit the plausibiilty of the parameters	Continue to Step 2	Error detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	Implausible parameters	Continue following the instructions for the diagnostic equipment
2	CHECK EGR AND ADJUST TURBOCHARGER	All OK	Problems met	Operation
1.9 JTD 8v 80 CV	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.	Carry out active diagnosis of EGR solenoid valve Continue to Step 3	EGR solenoid valve not working	Check wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			EGR solenoid valve not working	Replace the solenoid valve Op. 1080C74
			Turbocharger solenoid valve not working	Check wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Turbocharger solenoid valve not working	Replace the solenoid valve Op. 1064A28
1.9 JTD 8v 115 CV	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.	Carry out active diagnosis of EGR solenoid valve Check operation of the variable geometry control actuator by carrying out test 1064BC Continue to Step 3	EGR solenoid valve not working	Check wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			EGR solenoid valve not working	Replace the solenoid valve Op. 1080C74
			Turbocharger solenoid valve not working	Check wiring continuity See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Turbocharger solenoid valve not working	Replace the solenoid valve 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. Verify: that there are no errors in the control unit the plausibiilty of the parameters	Continue to Step 4	Error detected in the control unit	Continue following the instructions for the diagnostic equipment.
			Implausible 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 Test 1064BA	Continue to Step 5	Turbocharger faulty	Replace the turbochargerOp. 1064A10
5	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists: control unit defective	Replace the engine management control unit Op. 1060G80 Search for the fault starting from another symptom'

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Parts & tools for this job For 2001 Fiat Stilo

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