22 · Diagnostics

Misfire error in one cylinder

Make: Fiat
Model: Idea Factory Service Manual
Year: 2003–2012
Section: Examiner › Misfire error in one cylinder

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Fault diagnosisMisfire error in one cylinder

MISFIRE ERROR IN ONE CYLINDER

1.4 16v

The diagnostic equipment signals the following error: Misfire in cylinder X

Carry out the procedure for the circuit for the cylinder in which the error was detected

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the ignition circuit is correctly connected and working properly, paying particular attention to: Wiring; Connectors; High tension leads continuity See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 1	Faults in the electrical circuit	Repair the connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT If necessary, replace the faulty components. Continue to Step 10
1	IGNITION COIL CHECK	All OK	Problems met	Operation
	Via the check See Test 5510CC Check operation of ignition coils', test the operation of the coil connected to the relevant cylinder. In particular, check that the spark is regular	Continue to Step 2	The coil spark is not regular	Continue to Step 9
2	SPARK PLUG CONDITION CHECK	All OK	Problems met	Operation
	Check that the electrode gap for the spark plug concerned is within the permissible limits. Also check that the electrodes are not worn/broken	Continue to Step 3	Spark plug faulty	Replace the spark plug Op. 5510D10 Continue to Step 10
3	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Test the fuel pressure Op. 5510C10by turning the ignition ON and waiting for a few seconds. Start the engine normally and after a few seconds turn the ignition off. Check that the pressure remains at normal values and that it has not fallen by more than 1.5 bar 15 minutes after the engine has been turned off. Remove the injector flute complete with all the injectors Op. 5510C10 Place a container under the injector flute.	Continue to Step 6	Pressure is too low: constrictions on the supply pipe	Renew or, if necessary, replace the pipe. Continue to Step 10
			Excessive pressure drops after switch-off	Continue to Step 4
			Low pressure: faults in the fuel pump unit	Replace the fuel pump assembly Op. 1040A70 Continue to Step 10
4	CHECK INJECTOR SEAL	All OK	Problems met	Operation
	Remove the injector flute complete with all the injectors Op. 1056B60 Place a container under the injector flute. Turn the ignition on and after a few seconds turn it off again. Check that there are no fuel leaks from the injector concerned. Refit the injector flute Op. 1056B60 Work very carefully and in safe conditions	Continue to Step 5	The injector leaks	Replace the injector Op. 1056B70 Continue to Step 10
5	REPLACING FUEL PUMP	All OK	Problems met	Operation
	Replace the fuel pump assembly Op. 1040A70	Continue to Step 10
6	INJECTOR ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	Carry out active diagnosis on the injector concerned, checking that during activation there is spray from the injector. Refit the injector flute Op. 1056B60	Continue to Step 7	Injector stuck shut	Replace the injector Op. 1056B60 Continue to Step 10
7	CYLINDER COMPRESSION CHECK	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 10	Compression insufficient for the cylinder involved	Continue to Step 8
8	CHECK ON CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Carry out R/R on head to check the valve seal Check the condition of the cylinders/piston rings	End of diagnosis	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10 Continue to Step 10
		End of diagnosis	Cylinders/piston rings worn	Renew the seal. Continue to Step 10
9	COIL REPLACEMENT	All OK	Problems met	Operation
	Exchange the coil concerned with one from another cylinder and check via the check See Test 5510CC Check operation of ignition coils'that the spark is regular	Continue to Step 10	There is no regular spark	Renew the old coil and replace the engine management control unit Op. 1056B82 Continue to Step 10
10	ERROR CANCELLING AND CHECKING	All OK	Problems met	Operation
	Use a tester to cancel the errors in the control unit. Road test the vehicle and check that the error does not occur again	Continue to Step 11	The fault persists, it is the first or the second time that this Step has been reached and the control unit has not yet been replaced	Continue to Step 0
		Continue to Step 11	The fault persists, but it is the third time that this step has been reached or the control unit has already been replaced	Contact Technical Support for further information on the problem
11	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2003 Fiat Idea

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