22 · Diagnostics

CO EMISSIONS LOW, NOx EMISSIONS HIGH

Make: Lancia
Model: Ypsilon Factory Service Manual
Year: 2003–2011
Section: Emissions › CO EMISSIONS LOW, NOx EMISSIONS HIGH

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Fault diagnosisCO EMISSIONS LOW, NOx EMISSIONS HIGH

CO EMISSIONS LOW, NOx EMISSIONS HIGH

1.2 8v

The CO percentage measured is very low, with a corresponding NOx percentage higher than recommended levels

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check that there are no fault in the engine management control unit	Continue to Step 2	'Supply system' error detected	See table Z50
			'Misfire' error detected	See table Z53
			'Catalytic converter' error detected	See table Z55
			'Upstream lambda sensor' error detected	See table Z56
			'Downstream lambda sensor' error detected	See table Z58
			Another error dected in the control unit	Continue following the instructions for the diagnostic equipment.
			Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	Continue to Step 3	Connections faulty	Restore the connection of the injectors with the control unit See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 3	Injector faulty	Replace injector Op. 1056B70
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the upstream Lambda sensor is working properly.	Continue to Step 4	Lambda sensor faulty	Replace the Lambda sensor Op. 1080B94
4	DOWNSTREAM LAMDBA SENSOR CHECK	All OK	Problems met	Operation
	Check that the downstream Lambda sensor is working properly.	Continue to Step 5	Lambda sensor faulty	Replace the Lambda sensor Op. 1080B95
5	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check the condition of the air supply circuit	Continue to Step 6	Circuit component damaged	Replace the component involved
6	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gas intake circuit, in particular, check that there are no obstructions in the separator or the pipes	Continue to Step 7	Faulty circuit	Restore the operation of the system
		Continue to Step 7	Fault in the separator	Replace the separator
7	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10	Continue to Step 8	Pressure not correct	Replace the fuel pupm
8	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists

1.2 16v, 1.4 16v

The CO percentage measured is very low, with a corresponding NOx percentage higher than recommended levels

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check that there are no fault in the engine management control unit	Continue to Step 2	'Supply system' error detected	See table Z50
			'Misfire' error detected	See table Z53
			'Catalytic converter' error detected	See table Z55
			'Upstream lambda sensor' error detected	See table Z56
			'Downstream lambda sensor' error detected	See table Z58
			Another error dected in the control unit	Continue following the instructions for the diagnostic equipment.
			Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors	Continue to Step 3	Connections faulty	Restore the connection of the injectors with the control unit
		Continue to Step 3	Injector faulty	Replace injector Op. 1056B70
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the upstream Lambda sensor is working properly.	Continue to Step 4	Lambda sensor faulty	Replace the Lambda sensor Op. 1080B94
4	DOWNSTREAM LAMDBA SENSOR CHECK	All OK	Problems met	Operation
	Check that the downstream Lambda sensor is working properly.	Continue to Step 5	Lambda sensor faulty	Replace the Lambda sensor Op. 1080B95
5	CHECKING AIR CIRCUIT	All OK	Problems met	Operation
	Check the condition of the air supply circuit	Continue to Step 6	Circuit component damaged	Replace the component involved
6	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gas intake circuit, in particular, check that there are no obstructions in the separator or the pipes	Continue to Step 7	Faulty circuit	Restore the operation of the system
		Continue to Step 7	Fault in the separator	Replace the separator
7	CHECK ON FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10	Continue to Step 8	Pressure not correct	Replace the fuel pump
8	CHECK ON 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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