22 · Diagnostics

Misfire error

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

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Fault diagnosisMisfire error

MISFIRE ERROR

The diagnostic equipment signals the following error: Misfire

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Connect the tester (Examiner or Examiner Plus) and transcribe the errors and environmental parameters Check for '(General) Misfire' error only		'Upstream lambda probe' error present	See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			'Mixture concentration' error present	See table Z50 MIXTURE STRENGTH ERROR
			The 'Misifre in cylinder X error is present	See table Z54 MISFIRE ERROR IN ONE CYLINDER
			The '(General) Misfire', 'Catalyzer and/or 'Downstream Lambda signal' errors only are present	Continue to Step 1
			Other errors present	Identify and eliminate the cause of the anomaly. Continue to Step 10
1	CONTROL UNIT CIRCUIT CHECK	All OK	Problems met	Operation
	Visually inspect the condition of the engine management control unit wiring, connections and earth. No faults should be present	Continue to Step 2	Faults in the control unit electrical circuit	Restore the correct connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT. If necessary, replace the components involved. Continue to Step 10
2	CHECKING FUEL PRESSURE	All OK	Problems met	Operation
	Check that the fuel system pressure is correct Op. 0510C10	Continue to Step 3	Pressure not correct	Restore the correct pressure; if necessary, replace the faulty component. Continue to Step 10
3	CHECKING FUEL QUALITY	All OK	Problems met	Operation
	Check the quality of the fuel, making sure that there is no water or other impurities	Continue to Step 4	Impurities are present	Clean the tank Op. 1040A10and introduce new fuel. Continue to Step 10
4	CHECKING INLET AND EXHAUST SYSTEM SEAL	All OK	Problems met	Operation
	Check the exhaust system; See Test 1072A In particular, check that there are no leaks downstream of the MAP/flow meter sensor, also taking into consideration: blow-by; canister circuit; brake servo vacuum pipes; Injector O-Rings	Continue to Step 5	Leaks are present	Restore the exhaust system seal and replace the affected parts if necessary Continue to Step 10
5	ENGINE PROBLEMS CHECK	All OK	Problems met	Operation
	Check that there are no problems with the engine. In particular, check: correct cylinder compression Op. 0510A10 correct engine timing Op. 0510A20 correct rpm sensor position gap between rpm sensor and phonic wheel within permitted limits; visually for absence of faults on phonic wheel, such as broken or chipped teeth	Continue to Step 8	Engine timing incorrect	Ensure engine timing is correct Op. 1032B10 Continue to Step 6
			Rpm sensor incorrectly positioned	Reposition the sensor correctly. Continue to Step 6
			Flywheel defective	Replace the flywheel Op. 1092A10 Continue to Step 6
			Compression insufficient	Continue to Step 7
6	FLYWHEEL LEARNING	All OK	Problems met	Operation
	Carry out the flywheel learning procedure	Continue to Step 10
7	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	Continue to Step 8	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10 Continue to Step 6
		Continue to Step 8	Cylinders/piston rings worn	Renew the seal. Continue to Step 6
8	KINEMATIC MECHANISM CHECKS	All OK	Problems met	Operation
	Check that the kinematic mechanism is not oscillating by road testing the vehicle. In particular: clutch not jerking; couplings/bearings not faulty; engine mountings and supports not faulty; suspension loading correct; wheel balancing correct	Continue to Step 9	Clutch jerking	Replace the clutch Op. 1810A20 Continue to Step 10
			Anomalies in joints, bearings, blocks or mounts	Replace the components involved. Continue to Step 10
			Front suspension not loaded	Replace the shock absorber Op. 4410A12 Continue to Step 10
			Wheels not balanced	Balance the wheels Op. 4450B54. Replace the faulty tyres if necessary Continue to Step 10
9	CHECK ERROR IN A SINGLE CYLINDER	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or Examiner Plus) Check for the presence of 'Misfire at cylinder X error		Error present in at least 1 cylinder	See table Z54 MISFIRE ERROR IN ONE CYLINDERreferring to the cylinders concerned
			Error not present at a specific cylinder	See table Z54 MISFIRE ERROR IN ONE CYLINDERreferring to all cylinders in succession
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	Continue to Step 0
11	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

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Visually check on the instrument panel that the I.E. fault warning light is not flashing while the car is driving	Continue to Step 1	I.E. fault warning light flashing	Continue according to the instructions for the See table K48 I.E. FAILURE WARNING LIGHT FLASHING
1	CHECK ERROR	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or Examiner Plus) and transcribe the errors and environmental parameters. Check for '(General) Misfire' error only	End of diagnosis	'Upstream lambda probe' error present	Continue according to the instructions for the See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			'Mixture concentration' error present	Continue according to the instructions for the See table Z50 MIXTURE STRENGTH ERROR
			The 'Misifre in cylinder X error is present	Continue according to the instructions for the See table Z54 MISFIRE ERROR IN ONE CYLINDER
			The '(General) Misfire', 'Catalyzer and/or 'Downstream Lambda signal' errors only are present	Continue to Step 2
			Other errors present	Identify and eliminate the cause of the anomaly. Continue to Step 11
2	CONTROL UNIT CIRCUIT CHECK	All OK	Problems met	Operation
	Visually inspect the condition of the engine management control unit wiring, connections and earth. No faults should be present	Continue to Step 3	Faults in the control unit electrical circuit	Restore the correct connections See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT. If necessary, replace the components involved. Continue to Step 11
3	CHECKING FUEL PRESSURE	All OK	Problems met	Operation
	Check that the fuel system pressure is correct Op. 0510C10	Continue to Step 4	Pressure not correct	Restore the correct pressure; if necessary, replace the faulty component. and refill with fuel. Continue to Step 11
4	CHECKING FUEL QUALITY	All OK	Problems met	Operation
	Check the quality of the fuel, making sure that there is no water or other impurities	Continue to Step 5	Impurities are present	Clean the tank Op. 1040A24and introduce new fuel. Continue to Step 11
5	CHECKING INLET AND EXHAUST SYSTEM SEAL	All OK	Problems met	Operation
	Check the exhaust system visually and by listening. In particular, check that there are no leaks downstream of the MAP/flow meter sensor, also taking into consideration: blow-by; canister circuit; brake servo vacuum pipes; Injector O-Rings	Continue to Step 6	Leaks are present	Restore the exhaust system seal and replace the affected parts if necessary Continue to Step 11
6	ENGINE PROBLEMS CHECK	All OK	Problems met	Operation
	Check that there are no problems with the engine. In particular, check: correct cylinder compression Op. 0510A10 correct engine timing Op. 0510A20 correct rpm sensor position gap between rpm sensor and phonic wheel within permitted limits; visually for absence of faults on phonic wheel, such as broken or chipped teeth	Continue to Step 8	Engine timing incorrect	Ensure engine timing is correct Op. 1032B10 Continue to Step 7
			Rpm sensor incorrectly positioned	Reposition the sensor correctly. Continue to Step 7
			Flywheel defective	Replace the flywheel Op. 1024A28 Continue to Step 7
			Compression insufficient	Continue to Step 8
7	FLYWHEEL LEARNING	All OK	Problems met	Operation
	Carry out the flywheel learning procedure	Continue to Step 11
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	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10 Continue to Step 7
		Continue to Step 9	Cylinders/piston rings worn	Renew the seal. Continue to Step 7
9	KINEMATIC MECHANISM CHECKS	All OK	Problems met	Operation
	Check that the kinematic mechanism is not oscillating by road testing the vehicle. In particular: clutch not jerking; couplings/bearings not faulty; engine mountings and supports not faulty; suspension loading correct; wheel balancing correct	Continue to Step 10	Clutch jerking	Replace the clutch Op. 1810A20 Continue to Step 11
			Anomalies in joints, bearings, blocks or mounts	Replace the components involved. Continue to Step 11
			Front suspension not loaded	Replace the shock absorber Op. 4410A12 Continue to Step 11
			Wheels not balanced	Balance the wheels Op. 4450A70. Replace the faulty tyres if necessary Continue to Step 11
10	CHECK FOR ERRORS IN AN INDIVIDUAL CYLINDER CHECK CORRECT OPERATION	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or Examiner Plus) Check for the presence of 'Misfire at cylinder X error	End of diagnosis	Error present in at least 1 cylinder	Proceed as instructed See table Z54 MISFIRE ERROR IN ONE CYLINDERrefer to affected cylinders
		End of diagnosis	Error not present at a specific cylinder	Proceed as instructed See table Z54 MISFIRE ERROR IN ONE CYLINDERrefer to all cylinders in succession
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	Continue to Step 0
12	CHECK CORRECT OPERATION DELETE AND CHECK ERROR	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists

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Parts & tools for this job Staging For 2000 Fiat Doblò

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