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Alfa Romeo 147 Factory Service Manual (2000-2002)18 · Fault diagnosis

18 · Diagnostics

Z51 Rich fuel system

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2002
Section: Examiner › Z51 Rich fuel system

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Fault diagnosisZ51 Rich fuel system

Z51 Rich fuel system

Step	Test procedure	Result	Action
1	CANISTER VALVE CHECK Check that the canister valve is not stuck open	OK	Move onto step 2
1		Canister valve stuck open	Repair or, if necessary, replace the canister Op. 1080E20 Move onto step 6
2	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK Check the blow-by circuit See Test 1072A Intake and exhaust system leakage check In particular, check that there are no leaks from the engine sump to the intake circuit	OK	Move onto step 3
2		There are leaks	Renew the correct seal for the system. Replace faulty parts if necessary Move onto step 6
3	PETROL PRESSURE CHECK Turn the key to the ON position and check the activation of the fuel pump. Whilst the pump is activated, check that the fuel pressure is not too high	OK	Move onto step 4
		High pressure: fuel pressure regulator setting not correct	Calibrate correctly. Move onto step 6
		High pressure: fuel pressure regulator faulty	Replace the fuel pupm Op. 1040A70 Move onto step 6
4	CHECK ON FUEL INJECTORS Check the mechanical seal of the injectors. In particular, check that none of the injectors are stuck open	OK	Move onto step 5
4		Injectors defective	Renew the correct seal for the injectors, if necessary replace them Op. 1056B70 End of diagnosis
5	UPSTREAM LAMBDA SENSOR CHECK See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR starting from Step 3	OK	Incorrect selection of diagnostic procedure
5		Not OK	End of diagnosis
6	ERROR CANCELLING AND CHECKING Using the diagnostic equiment, cancel the errors in the control unit. Road test the vehicle and check that the error does not occur again	OK	Move onto step 7
6		The fault persists	Move onto step 7
7	CORRECT OPERATION CHECK Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
7		Fault persists	Incorrect selection of diagnostic procedure

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Parts & tools for this job For 2000 Alfa Romeo 147

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