22 · Diagnostics

High co emissions

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Emissions › High co emissions

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Fault diagnosisHigh co emissions

HIGH CO EMISSIONS

1.6 TS

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
1	CHECKING 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	'Fuel system' error appears	See table Z50 MIXTURE STRENGTH ERROR
			'Misfiring' error appears	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 detected	See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
			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 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
			injector anomaly	Replace injector Op. 1056B70
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the upstream Lambda sensor is working properly See Test 1080BA CHECK ON UPSTREAM LAMBDA SENSOR OPERATION	Continue to Step 4	Lambda sensor defective	Replace the Lambda sensor Op. 1080B94
4	DOWNSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the downstream Lambda sensor is working properly See Test 1080BD CHECK ON DOWNSTREAM LAMBDA SENSOR OPERATION	Continue to Step 5	Lambda sensor defective	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 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
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'

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
1	CHECKING 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	'Fuel system' error appears	See table Z50 MIXTURE STRENGTH ERROR
			'Misfiring' error appears	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 detected	See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
			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 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
			injector anomaly	Replace injector Op. 1056B70
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the upstream Lambda sensor is working properly See Test 1080BA CHECK ON UPSTREAM LAMBDA SENSOR OPERATION	Continue to Step 4	Left Lambda sensor faulty	Replace the left Lambda sensor Op. 1080B93
		Continue to Step 4	Right Lambda sensor faulty	Replace the right Lambda sensor Op. 1080B92
4	DOWNSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the downstream Lambda sensor is working properly See Test 1080BD CHECK ON DOWNSTREAM LAMBDA SENSOR OPERATION	Continue to Step 5	Lambda sensor defective	Replace the Lambda sensorOp. 1080B90
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
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'

2.0 TS

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
1	CHECKING 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	'Fuel system' error appears	See table Z50 MIXTURE STRENGTH ERROR
			'Misfiring' error appears	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 detected	See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
			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 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
			injector anomaly	Replace injector Op. 1056B70
3	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the upstream Lambda sensor is working properly See Test 1080BA CHECK ON UPSTREAM LAMBDA SENSOR OPERATION	Continue to Step 4	Left Lambda sensor faulty	Replace the left Lambda sensor Op. 1080B93
		Continue to Step 4	Right Lambda sensor faulty	Replace the right Lambda sensor Op. 1080B92
4	DOWNSTREAM LAMBDA SENSOR CHECK	All OK	Problems met	Operation
	Check that the downstream Lambda sensor is working properly See Test 1080BD CHECK ON DOWNSTREAM LAMBDA SENSOR OPERATION	Continue to Step 5	Lambda sensor defective	Replace the Lambda sensor Op. 1080B90
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
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 Sun roof water penetration Next › CO EMISSIONS LOW, NOx EMISSIONS HIGH

Parts & tools for this job For 2000 Alfa Romeo 147

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