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Alfa Romeo 147 Factory Service Manual (2000-2004)22 · Fault diagnosis

22 · Diagnostics

Rich fuel system

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Examiner › Rich fuel system

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Fault diagnosisRich fuel system

RICH FUEL SYSTEM

1.6 TS, 2.0 TS

1	CANISTER VALVE CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the canister valve is not stuck open	Continue to Step 2	Canister valve stuck open	Repair or, if necessary, replace the canister Op. 1080E20 Continue to Step 5
2	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK	All OK	Problems met	Operation
	Check the blow-by circuit, visually checking that there are no leaks from the engine sump to the intake circuit. Also check, visually and by listening, that there are no leaks from the intake and exhaust systems	Continue to Step 3	There are leaks	Eliminate leaks from the system. Replace faulty parts if necessary Continue to Step 5
3	PETROL PRESSURE CHECK	All OK	Problems met	Operation
	Turn the key to MAR and check that fuel pump activates. While the pump is active, check fuel pressure is not too high. Turn the ignition off and check that the pressure does not fall by more than 1 bar over a period of 15 minutes.	Continue to Step 4	High pressure: fuel pressure regulator setting not correct	Replace the fuel pupm Op. 1040A70 Continue to Step 5
			The pressure falls by more than 1 bar in the established time: faulty injectors	Renew the correct seal for the injectors, if necessary replace them Op. 1056B70 Continue to Step 5
			The pressure falls by more than 1 bar in the established time: leaks from the fuel pressure regulator	Replace the fuel pupm Op. 1040A70 Continue to Step 5
			The pressure falls by more than 1 bar in the established time: leaks from the non-return valve on the fuel pump	Replace the fuel pupm Op. 1040A70 Continue to Step 5
4	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	starting from Step 3 See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR			Renew the correct seal for the injectors, if necessary replace them Search for the fault starting from another symptom'
5	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 6	The fault persists	Continue to Step 1
6	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

1	CANISTER VALVE CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the canister valve is not stuck open	Continue to Step 2	Canister valve stuck open	Repair or, if necessary, replace the canister Op. 1080E20 Continue to Step 5
2	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK	All OK	Problems met	Operation
	Check the blow-by circuit, visually checking that there are no leaks from the engine sump to the intake circuit. Also check, visually and by listening, that there are no leaks from the intake and exhaust systems	Continue to Step 3	There are leaks	Eliminate leaks from the system. Replace faulty parts if necessary Continue to Step 5
3	PETROL PRESSURE CHECK	All OK	Problems met	Operation
	Turn the key to MAR and check that fuel pump activates. While the pump is active, check fuel pressure is not too high. Turn the ignition off and check that the pressure does not fall by more than 1 bar over a period of 15 minutes.	Continue to Step 4	High pressure: fuel pressure regulator setting not correct	Replace the fuel pupm Op. 1040A70 Continue to Step 5
			The pressure falls by more than 1 bar in the established time: faulty injectors	Renew the correct seal for the injectors, if necessary replace them Op. 1056B70 Continue to Step 5
			The pressure falls by more than 1 bar in the established time: leaks from the fuel pressure regulator	Replace the fuel pupm Op. 1040A70 Continue to Step 5
			The pressure falls by more than 1 bar in the established time: leaks from the non-return valve on the fuel pump	Replace the fuel pupm Op. 1040A70 Continue to Step 5
4	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Continue as instructed in the Table See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERRORstarting from Step 3	End of diagnosis
5	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 6	The fault persists	Continue to Step 1
6	CORRECT OPERATION CHECK	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 2000 Alfa Romeo 147

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