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Fiat Doblò Factory Service Manual (2000-2010)22 · Fault diagnosis

22 · Diagnostics

Rich fuel system

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Examiner › Rich fuel system

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Fault diagnosisRich fuel system

RICH FUEL SYSTEM

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 6
2	INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK	All OK	Problems met	Operation
	Check the blow-by circuit See Test 1072A In particular, check that there are no leaks from the engine sump to the intake circuit	Continue to Step 3	Leaks are present	Eliminate leaks from the system. Replace faulty parts if necessary Continue to Step 6
3	PETROL PRESSURE CHECK	All OK	Problems met	Operation
	Turn the key to MAR and check fuel pump activates. Whilst the pump is activated, check that the fuel pressure is not too high	Continue to Step 4	High pressure: fuel pressure regulator setting not correct	Calibrate correctly. Continue to Step 6
		Continue to Step 4	High pressure: fuel pressure regulator faulty	Replace the fuel pump Op. 1040A70 Continue to Step 6
4	CHECK ON FUEL INJECTORS	All OK	Problems met	Operation
	Check the mechanical seal of the injectors. In particular, check that none of the injectors are stuck open	Continue to Step 5	Injectors defective	Renew the correct seal for the injectors, if necessary replace them Op. 1056B70 Continue to Step 6
5	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Starting from Step 3 See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR	End of diagnosis
6	DELETING AND CHECKING ERROR	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 7	The fault persists	See table Z50 MIXTURE STRENGTH ERROR
7	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists

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 SEAL 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	Leaks are present	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 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 a 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 pump 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 pump 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 pump Op. 1040A70 Continue to Step 5
4	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Continue according to the instructions for the See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR	Continue to Step 3
5	DELETING AND CHECKING ERROR	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	Continue to Step 1
6	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists

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