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

125000737 - 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	End of diagnosis	The Upstream Lambda signal error is present	Continue according to the instructions inSee table See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			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 problem.Continue to Step 3
1	SENSOR CHECK	All OK	Problems met	Operation
	Visually inspect: The installation of the sensors; That the terminals are not corroded; That the wiring between the sensor and the ECU is not faulty	Continue to Step 2	Lambda sensors fitted incorrectly	Fit the Lambda sensors correctlyContinue to Step 3
			Terminals corroded	Replace faulty componentsContinue to Step 3
			Wiring faulty	Restore correct connections. If necessary, replace the faulty components See See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT.Continue to Step 3
2	REPLACING UPSTREAM LAMBDA SENSORS	All OK	Problems met	Operation
	Replace the upstream Lambda sensors.Search for the cause of the pollution in the sensors. 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	Continue according to the instructions inSee table See table X12 ENGINE OIL LEAKS
3	ERROR CANCELLING AND CHECKING	All OK	Problems met	Operation
	Use a tester to cancel the errors in the control unit.Carry out a road test and ensure the error does not recur.	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 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 Service for further information on the problem
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	.