Engine not running smoothly / (irregular operation)

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Engine › Engine not running smoothly / (irregular operation)

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Fault diagnosisEngine not running smoothly / (irregular operation)

ENGINE NOT RUNNING SMOOTHLY / (IRREGULAR OPERATION)

1.2 16v, 1.6 16v, 1.8 16v, 2.4 20v

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	First check: the condition of the air filter battery earth correctly fixed See E1010 SUPPLY	Continue to Step 1	Filter element dirty, damaged or incorrectly fitted	Replace or refit filter element correctly Op. 1048A14
		Continue to Step 1	Earth fastening not correct	Renew the wiring
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 faults in the engine management control unit the plausibiilty of the parameters	Continue to Step 2	'Fuel system' error appears	See table Z50 MIXTURE STRENGTH ERROR
			'Upstream lambda sensor' error detected	See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			Another error dectected in the control unit	Continue following the instructions for the diagnostic equipment
			Incoherent parameter	Continue following the instructions for the diagnostic equipment.
2	ROAD TEST WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Road test the vehicle, reproducing the conditions under which the fault arises, keeping the diagnostic equipment connected Verify: that there are no faults in the engine management control unit the plausibiilty of the parameters	Continue to Step 3	'Fuel system' error appears	See table Z50 MIXTURE STRENGTH ERROR
			'Upstream lambda sensor' error detected	See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			Sudden occurrence of another error detected in the control unit	Continue following the instructions for the diagnostic equipment
			Incoherent parameter	Continue following the instructions for the diagnostic equipment
3	CHECKING FUEL PRESSURE	All OK	Problems met	Operation
	Check, if necessary on the road (to reproduce the conditions in which the fault arises), the fuel supply pressure Op. 0510C10	Continue to Step 4	Incorrect pressure: obstructions in the fuel supply pipe	Remove the obstructions in the fuel pipe, and if necessary replace it
		Continue to Step 4	Pressure incorrect: fuel pump damaged	Replace fuel pump assembly Op. 1040A70
4	CHECK ON AIR CONDITIONING	All OK	Problems met	Operation
	Road test the vehicle and check whether the fault is affected by whether or not the air conditioner is switched on	Continue to Step 5	Fault present only when air conditioner is on	Continue as instructed in the Table See table L10 CLIMATE CONTROL NOT COOLING
5	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists: control unit defective	Replace control unit Op. 1056B82 Search for the fault starting from another symptom'

1.9 JTD 8v

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 that there is no water, petrol, paraffin or dirt in the fuel tank and filter that the battery earth is correctly fixed	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
			Presence of water, petrol, parffin or dirt detected.	Clean the tank and pipes and replace the filter element
			Loose battery earth terminal	Restore the correct fixing of the earth cable
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	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 3	Error detected in control units	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	Continue following the instructions for the diagnostic equipment
			Incoherent parameter	Restore the connection between the engine management control unit and the diagnostic connector.
3	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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