Z53 MISFIRE ERROR - Alfa - 156 - eLearn

3233221 - Z53 MISFIRE ERROR

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 I.E. FAILURE WARNING LIGHT FLASHING
1	CHECK ERROR	All OK	Problems met	Operation
	Connect the tester (Examiner or other instruments) and transcribe the errors and environmental parametersCheck for '(General) Misfire' error only	End of diagnosis	'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 2
2	CONTROL UNIT CIRCUIT CHECK	All OK	Problems met	Operation
	Visually inspect the condition of the wiring, connections and earth of the engine management control unit.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 and if necessary replace the components concerned 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. 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 and fill with new fuel Continue to Step 11
5	CHECKING SIGNAL PLAUSIBILITY	All OK	Problems met	Operation
	Checking plausibility of the MAP/debimeter sensor signal See Test 1056BX MAP/flow meter signal plausibility	Continue to Step 6	The signal is not plausible	Replace the flowmeter Op. 1056B09 Continue to Step 11
6	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, considering also: blow-by; canister circuit; brake servo vacuum pipes; injector O-rings.	Continue to Step 7	Leaks are present	Eliminate the leaks from the exhaust system, if necessary, replace the components involved Continue to Step 11
7	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 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. 1032B14 Continue to Step 11
			Rpm sensor incorrectly positioned	Reposition the sensor correctly
			Flywheel defective	Replace the phonic wheel Continue to Step 11
			Compression insufficient	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 sealCheck the condition of the cylinders/piston rings	Continue to Step 9	Insufficient valve seal	Overhaul the cylinder head Continue to Step 11
		Continue to Step 9	Cylinders/piston rings worn	Repair the leak 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
			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 and if necessary replace the tyres Continue to Step 11
10	CHECK ERROR IN A SINGLE CYLINDER	All OK	Problems met	Operation
	Connect the diagnostic equipment (Examiner or other instruments)Check for the presence of 'Misfire at cylinder X' error	End of diagnosis	The error is present on at least one cylinder	See table Z54 MISFIRE ERROR IN ONE CYLINDER referring to the cylinders concerned
		End of diagnosis	The error is not present on a specific cylinder	See table Z54 MISFIRE ERROR IN ONE CYLINDER all the cylinders in succession
11	DELETING AND CHECKING ERROR	All OK	Problems met	Operation
	Use a tester to cancel the errors in the control unitCarry out a road test and ensure the error does not recur	Continue to Step 12	The fault persists	Continue to Step 0
12	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'