Z57 UPSTREAM LAMBDA SENSOR SIGNAL ERROR - Alfa - 147 - eLearn

3022777 - Z57 UPSTREAM LAMBDA SENSOR SIGNAL ERROR

The diagnostic equipment signals the following error: Upstream Lambda signal (slow)

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters.Check for the 'Upstream Lambda signal (slow)' error only		The 'Upstream Lambda signal' error is present	See table Z56
			Only the 'Upstream Lambda signal (slow)', 'Mixture strength', 'Misfire', 'Catalyzer' and/or 'Downstream Lambda signal' errors are present	Continue to Step 1
			Other errors are present	Identify and eliminate the cause of the anomaly.Continue to Step 3
1	SENSOR CHECK	All OK	Problems met	Operation
	Visually inspect: the fitting of the sensor; that the terminals are not corroded; that the wiring between the sensor and the ECU is not faulty.	Continue to Step 2	Lambda sensor fitted incorrectly	Fit the Lambda sensor correctly Op. 1080B90Continue to Step 3
			Terminals corroded	Replace faulty componentsContinue to Step 3
			Wiring faulty	Restore correct connections. If necessary, replace the faulty components See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT Continue to Step 3
2	REPLACING UPSTREAM LAMBDA SENSOR	All OK	Problems met	Operation
	Replace the upstream Lambda sensor Op. 1080B90Search for the cause of the pollution in the sensor. The probable causes are: contaminated petrol; engine oil leaks; improper use of fastenings at sensor connector.	Continue to Step 3	Use of contaminated petrol	Clean the tank Op. 1040A24and introduce suitable quality fuel.Continue to Step 3
		Continue to Step 3	Engine oil leaks detected	See table X12
3	ERROR CANCELLING AND CHECKING	All OK	Problems met	Operation
	Use a tester to cancel the errors in the control unit.Road test the vehicle and check that the error does not occur again	Continue to Step 4	The fault persists, it is the first time that this step has been reached and the Lambda sensor has not yet been replaced	Continue to Step 0
		Continue to Step 4	The fault persists, but it is the second time that this step has been reached or the Lambda sensor has already been replaced	Contact Technical Support for further information on the problem
4	CORRECT OPERATION CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'