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Alfa Romeo GT Factory Service Manual (2003-2010)22 · Fault diagnosis

22 · Diagnostics

Lean fuel system

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Examiner › Lean fuel system

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Fault diagnosisLean fuel system

LEAN FUEL SYSTEM

1.8 T.SPARK, 3.2 V6

1	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the intake and exhaust system visually and by listening, to check that there are no leaks downstream of the MAP sensor/flow meter. Also take into account: blow-by circuit; canister circuit, checking that the valve is not stuck open; brake servo vacuum pipes; Injector O-Rings	Continue to Step 2	There are leaks	Restore the correct seal for the system. Replace faulty parts if necessary Continue to Step 5
2	PETROL PRESSURE CHECK	All OK	Problems met	Operation
	Turn the key to MAR and check that fuel pump activates. Whilst the pump is activated, check that the fuel pressure is not too low	Continue to Step 3	Low pressure: fuel filter blocked/obstructed	Replace the fuel pump Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R Continue to Step 5
			Low pressure: supply pipe restrictions/leaks	Renew or, if necessary, replace the pipes involved
			Low pressure: pressure regulator defective	Replace the fuel pump Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R Continue to Step 5
			Low pressure: pressure regulator incorrectly calibrated	Replace the fuel pump Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R Continue to Step 5
			Low pressure: electrical problem in the fuel pump	Restore correct connections See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT . If necessary, replace the fuel pump Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R Continue to Step 5
			Low pressure: excess pressure valve stuck open	Replace the fuel pump Op. Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GUAGE CONTROL - R + R Continue to Step 5
3	FUEL QUALITY CHECK	All OK	Problems met	Operation
	Check that there is no water or other substances in the tank which is contaminating the fuel.	Continue to Step 4	Impurities present	Clean the tank Op. 1040A24 and introduce new fuel. Continue to Step 5
4	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Continue according to the instructions in	See table Z56
5	ERROR CANCELLING AND CHECKING	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 6	The fault persists
6	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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