22 · Diagnostics

High co emissions

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Emissions › High co emissions

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Fault diagnosisHigh co emissions

HIGH CO EMISSIONS

1.8 T.SPARK

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

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
	Check the condition of the air filter	Move on to Step 1 1	Filter element dirty or damaged	Replace the filter element
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check that there are no faults in the engine management control unit	Move on to Step 2 1	"Fuel system" error detected	Continue following the instructions in the Table Z50 ERRORE TITOLO MISCELA
			"Misfire" error detected	Continue following the instructions in the Table Z53 ERRORE MANCATE ACCENSIONI
			"Catalyzer" error detected	Continue following the instructions in the Table Z55 ERRORE CATALIZZATORE
			"Upstream Lambda sensor" error detected	Continue following the instructions in the Table See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			"Downstream Lambda sensor" error detected	Continue following the instructions in the Table See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
			Another error detected in the control unit	Continue following the instructions for the diagnostic equipment
			No communication 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 encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) and carry out the active diagnosis for: vapour recovery solenoid valve injectors	Move on to Step 3 1	Connections faulty	Restore connection for injectors and solenoid valve with control unit See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			Solenoid valve faulty	Replace the solenoid valve
			Injector faulty	Replace the injector Op. Op. 1056B70 ELETTROINIETTORE (UNO) - S.R. A TUBO COLLETTORE COMBUSTIBILE STACCATO - COMPRENDE LA SOST. DELLA GUARNIZIONE
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the upstream Lambda sensor is working properly See Test 1080BA VERIFICA FUNZIONALITA'' SONDA LAMBDA A MONTE	Move on to Step 4 1	Left Lambda sensor defective	Replace the left Lambda sensor Op. 1080B93 RIGHT UPPER LAMBDA SENSOR R R
			Right Lambda sensor defective	Replace the right Lambda sensor Op. 1080B92 LEFT UPPER LAMBDA SENSOR R R
4	DOWNSTREAM LAMBDA SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the downstream Lambda sensor is working properly See Test 1080BD VERIFICA FUNZIONALITA'' SONDA LAMBDA A VALLE	Move on to Step 5 1	Lambda sensor defective	Replace downstream lambda sensor Op. 1080B90 LAMBDA PROBE R R
5	AIR CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the condition of the air supply circuit	Move on to Step 6 1	Circuit component damaged	Replace the component involved
6	FUEL PRESSURE CHECK	All OK	Problems encountered	Operation
	Check the fuel supply pressure Op. 0510C10	Move on to Step 7 1	Pressure not correct	Replace the fuel pump
7	CHECK CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2003 Alfa Romeo GT

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