125000736 - Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR

The diagnostic equipment signals the following error: Upstream lambda signal

		Results of the tests
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or Examiner Plus) and check the errors and environmental parameters.Check that there is only the "upstream Lambda signal" error		If only the upstream Lambda signal error, Mixture strength, Misfire, Catalyzer and/or Downstream Lambda signal is present	Move on to Step 1 1
			Identify and eliminate the cause of the problem.	Move on to Step 8 1
1	CHECK	All OK	Problems encountered	Operation
	Check the upstream Lambda signal error detailIn particular, check that it is not invalid/below minimum level signal	Move on to Step 3 1	The detail is above the upper limit with error P0133, P0153, P0139, P1133 and/or P1153	Continue following the instructions in the Table    See table Z57 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			The detail is below the lower limit	Continue following the instructions in the Table    See table Z57 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
			The detail is invalid/below minimum level signal	Move on to Step 2 1
2	INTAKE AND EXHAUST SYSTEM SEAL CHECK	All OK	Problems encountered	Operation
	Check the exhaust system by looking and listening. In particular, check that there are no leaks before the upstream Lambda sensor	Move on to Step 3	There are leaks	Restore the correct seal for the exhaust system, if necessary, replace the components involved
3	UPSTREAM LAMBDA SENSOR SWITCHING CHECK	All OK	Problems encountered	Operation
	Cancel the errors in the control unit using the diagnostic equipment. Start up the engine, let it warm up and, using the diagnostic equipment, check the activation of the 1st loop mixture strength check (or, alternatively the upstream Lambda signal switching)	Move on to Step 4	The activation does not take place (or the signal does not switch)	Move on to Step 6
4	LAMBDA SENSOR WIRING CHECK	All OK	Problems encountered	Operation
	Check the upstream Lambda sensor wiring, checking that there are no false contacts: Wiring Diagram    See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Move on to Step 5	There are false contacts	Restore the correct connections. If necessary, replace the defective components. Move on to Step 8
5	ECU SOFTWARE CHECK	All OK	Problems encountered	Operation
	Check, using the documentation, for the existence of updated engine management software calibration	Move on to Step 8	There is no updated software calibration for the control unit	Reprogramme the engine management control unit. Move on to Step 8
6	LAMBDA SENSOR/ECU INPUT WIRING CHECK	All OK	Problems encountered	Operation
	Check the wiring for the ECU upstream Lambda sensor input circuit, checking that there are no short circuits to earth, open circuits or false contacts Wiring Diagram    See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Move on to Step 7	There are faulty connections	Restore the correct connections. If necessary, replace the defective components. Move on to Step 8
7	UPSTREAM LAMBDA SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the upstream sensor is working properly by carrying out Test 1080BA    See Test 1080 EXHAUST EMISSION CONTROL SYSTEM	Move on to Step 8	Lambda sensor defective	Replace the upstream Lambda sensor Op. 1080B90 LAMBDA PROBE R R
8	ERROR CANCELLING AND CHECK	All OK	Problems encountered	Operation
	Using the diagnostic equipment, cancel the errors in the control unit.Road test the vehicle and check that the errror does not occur again	Move on to Step 9	The fault persists, it is the first time that this Step has been reached and the Lambda sensor has not yet been replaced	Move on to Step 0
			The fault persists, but it is the second time that this Step has been reached or the Lambda sensor has already been replaced	Contact the Service Department for further information on the problem
9	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis