22 · Diagnostics

Misfire error in one cylinder

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Examiner › Misfire error in one cylinder

‹ Prev Misfire error Next › Catalyzer error

Fault diagnosisMisfire error in one cylinder

MISFIRE ERROR IN ONE CYLINDER

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 lead continuity See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 1	Faults in the electrical circuit	Restore the correct connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT. Replace faulty components if necessary. Continue to Step 11
1	IGNITION COIL CHECK	All OK	Problems met	Operation
	Using the Examiner 180636900, visually check the operation of the coil connected to the cylinder concerned. In particular, check that the spark is regular	Continue to Step 2	The coil spark is not regular	Continue to Step 7
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 11
3	CHECKING FUEL PRESSURE	All OK	Problems met	Operation
	Turn the key to MAR and check fuel pump activates. While the pump is active, check fuel pressure is not too low	Continue to Step 4	Pressure is too low	Check that the injector is not stuck open or that there are no leaks. If necessary, replace the injector Op. 1056B70 Continue to Step 11
4	INJECTOR ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	Carry out the active diagnosis of the injector concerned, checking that it is not stuck shut	Continue to Step 5	Injector stuck shut	Replace the injector Op. 1056B70 Continue to Step 11
5	CYLINDER COMPRESSION CHECK	All OK	Problems met	Operation
	Carry out the cylinder compression test Op. 0510A10	Continue to Step 11	Compression insufficient for the cylinder involved	Continue to Step 6
6	CHECKING 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		Insufficient valve seal	Overhaul the cylinder head Op. 1016E10 Continue to Step 11
			Cylinders/piston rings worn	Renew the seal. Continue to Step 11
7	COIL RESISTANCE CHECK	All OK	Problems met	Operation
	See Test 5510CCheck that the resistance in the primary and secondary windings is within the permissible limits for the coil concerned	Continue to Step 8	Some values are outside permitted tolerances	Replace the coil Op. 5510C14 Continue to Step 11
8	CHECK INSULATION BETWEEN CIRCUITS	All OK	Problems met	Operation
	Check that there is insulation between the primary and secondary windings of the coil concerned	Continue to Step 9	The insulation is not correct	Replace the coil Op. 5510C14 Continue to Step 11
9	IGNITION CIRCUIT CHECK	All OK	Problems met	Operation
	Check that the wiring and the connectors for the ignition circuit are correctly connected See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT. In particular, check that there are no open or short circuits If fitted, check the connections between the power module and the engine management control unit	Continue to Step 10	Connections faulty	Restore correct connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENTIf necessary, replace the defective components Continue to Step 11
10	COIL REPLACEMENT	All OK	Problems met	Operation
	Exchange the coil concerned with one from another cylinder Op. 5510C10and check, using the Examiner 1806369000 that the spark is regular	Continue to Step 11	There is no regular spark	Renew the old coil and replace the engine management control unit Op. 1056B82 Continue to Step 11
11	DELETING AND CHECKING ERROR	All OK	Problems met	Operation
	Use a tester to cancel the errors in the control unit. Carry out a road test and ensure the error does not recur	Continue to Step 12	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 12	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
12	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists

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 lead continuity See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 1	Faults in the electrical circuit	Restore the correct connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT. Replace faulty components if necessary. Continue to Step 10
1	IGNITION COIL CHECK	All OK	Problems met	Operation
	Using the Examiner 180636900, visually check the operation of the coil connected to the cylinder concerned. 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	CHECKING FUEL PRESSURE	All OK	Problems met	Operation
	Test the fuel pressure Op. 0510C10by 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. 1056B60. 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
	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. 1056B70 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	CHECKING 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. 1010E10 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 Op. 5510C10and check, using the Examiner 1806369000 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	DELETING AND CHECKING ERROR	All OK	Problems met	Operation
	Use a tester to cancel the errors in the control unit. Carry out a road test and ensure the error does not recur	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	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists

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