22 · Diagnostics

High co emissions

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Emissions › High co emissions

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Fault diagnosisHigh co emissions

HIGH CO EMISSIONS

The percentage of CO and/or HC is higher than the recommended figure.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the air filter	Continue to Step 1	Filter element dirty or damaged	Replace the filter element Op. 1048A14
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the engine management control unit	Continue to Step 2	'Supply system' error detected	See table Z50 MIXTURE STRENGTH ERROR
			'Misfire' error detected	See table Z53 MISFIRE ERROR
			'Catalytic converter' error detected	See table Z55 CATALYZER ERROR
			'Upstream lambda sensor' error detected	See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			'Downstream lambda sensor' error detecte	See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
			Another error detected 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 iinstruments) carry out active diagnosis on the: vapour recovery solenoid valve Injectors	Continue to Step 3	Connections faulty	Restore the connection of the injectors and the solenoid with the control unit See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			Solenoid valve faulty	Replace the solenoid valve Op. 1080E28
			Faulty injector	Replace injector Op. 1056B70
3	CHECKING LAMBDA SENSOR	All OK	Problems met	Operation
	Check that the Lambda sensor is working properly	Continue to Step 4	Upper lambda sensor defective	Replace the upper Lambda sensor Op. 1080B94
	Check that the Lambda sensor is working properly	Continue to Step 4	Lower lambda sensor defective	Replace the lower Lambda sensor Op. 1080B95
4	CHECKING CATALYTIC CONVERTER	All OK	Problems met	Operation
	Check that the catalytic converter is working properly	Continue to Step 5	Catalytic converter defective	Replace the exhaust manifold Op. 1072C16
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 FUEL PRESSURE	All OK	Problems met	Operation
	Check the fuel supply pressure Op. 0510C10	Continue to Step 7	Pressure not correct	Replace the fuel pump Op. 1040A70
7	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

‹ Prev Sliding door water penetration Next › CO EMISSIONS LOW, NOx EMISSIONS HIGH

Parts & tools for this job For 2000 Fiat Doblò

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