22 · Diagnostics

Misfire error

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Examiner › Misfire error

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Fault diagnosisMisfire error

MISFIRE ERROR

1.6 TS, 2.0 TS

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	See table K48
1	CHECK ERROR	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters. Check for '(General) Misfire' error only		The 'Upstream Lambda signal' error is present	See table Z56
			The 'Mixture strength' error is present	See table Z50
			The 'Misifre in cylinder X error is present	See table Z54
			The '(General) Misfire', 'Catalyzer and/or 'Downstream Lambda signal' errors only are present	Continue to Step 2
			Other errors are 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. There should be no faults	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	CHECK ON 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 components. Continue to Step 11
4	FUEL QUALITY CHECK	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 present	Clean the tank Op. 1040A24and introduce new fuel. Continue to Step 11
5	SIGNAL PLAUSIBILITY CHECK	All OK	Problems met	Operation
	Checking plausibility of the MAP/flowmeter sensor signal See Test 1056BX MAP/flow meter signal plausibility	Continue to Step 6	The signal is not plausible	Replace the flowmeter Op. 1056B12 Continue to Step 11
6	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK	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 7	There are leaks	Restore the correct seal for the exhaust system, if necessary, replace the components involved. Continue to Step 11
7	CHECK	All OK	Problems met	Operation
	Check that there are no problems with the engine. In particular, check: cylinder compression correct Op. 0510A10; correct engine timing Op. 0510A20; correct rpm sensor position gap between rpm sensor and flywheel within permissible limits no visible faults on the flywheel, such as broken or chipped teeth	Continue to Step 8	Engine timing incorrect	Ensure engine timing is correct Op. 1032B10 Continue to Step 11
			Rpm sensor incorrectly positioned	Reposition the sensor correctly. Continue to Step 11
			Flywheel defective	Replace the flywheel Op. 1024A28 Continue to Step 12
			Compression insufficient	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	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10 Continue to Step 11
		Continue to Step 9	Cylinders/piston rings worn	Renew the seal. Continue to Step 11
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
			Couplings, bearings, mountings or supports faulty	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 tyres Replace the faulty tyres if necessary Continue to Step 11
10	INDIVIDUAL CYLINDER ERROR CHECK	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	referring to the cylinders concerned See table Z54
			Error not present at a specific cylinder	referring to all cylinders in succession See table Z54
11	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 12	The fault persists	Continue to Step 0
12	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

3.2 V6

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	See table K48
1	CHECK ERROR	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters. Check for '(General) Misfire' error only		The 'Upstream Lambda signal' error is present	See table Z56
			The 'Mixture strength' error is present	See table Z50
			The 'Misifre in cylinder X error is present	See table Z54
			The '(General) Misfire', 'Catalyzer and/or 'Downstream Lambda signal' errors only are present	Continue to Step 2
			Other errors are 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. There should be no faults	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	CHECK ON 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 components. Continue to Step 11
4	FUEL QUALITY CHECK	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 present	Clean the tank Op. 1040A24and introduce new fuel. Continue to Step 11
5	SIGNAL PLAUSIBILITY CHECK	All OK	Problems met	Operation
	Checking plausibility of the MAP/flowmeter sensor signal See Test 1056BX MAP/flow meter signal plausibility	Continue to Step 6	The signal is not plausible	Replace the flowmeter Op. 1056B12 Continue to Step 12
6	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK	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 7	There are leaks	Restore the correct seal for the exhaust system, if necessary, replace the components involved. Continue to Step 11
7	CHECK	All OK	Problems met	Operation
	Check that there are no problems with the engine. In particular, check: cylinder compression correct Op. 0510A10; correct engine timing Op. 0510A20; correct rpm sensor position gap between rpm sensor and flywheel within permissible limits no visible faults on the flywheel, such as broken or chipped teeth	Continue to Step 8	Engine timing incorrect	Ensure engine timing is correct Op. 1032B10 Continue to Step 11
			Rpm sensor incorrectly positioned	Reposition the sensor correctly. Continue to Step 11
			Flywheel defective	Replace the flywheel Op. 1024A28 Continue to Step 11
			Compression insufficient	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	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head Op. 1016E10 Continue to Step 11
		Continue to Step 9	Cylinders/piston rings worn	Renew the seal. Continue to Step 11
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
			Couplings, bearings, mountings or supports faulty	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 tyresOp. 4450A70Replace the faulty tyres if necessary Continue to Step 11
10	INDIVIDUAL CYLINDER ERROR CHECK	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	referring to the cylinders concerned See table Z54
		End of diagnosis	Error not present at a specific cylinder	referring to all cylinders in succession See table Z54
11	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 12	The fault persists	Continue to Step 0
12	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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