3360357 - Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR

The diagnostic equipment signals the following error: Upstream Lambda signal
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Connect the tester (Examiner or Examiner Plus) and transcribe the errors and environmental parametersCheck for the 'Upstream Lambda signal' error onlyEnd of diagnosisOnly the 'Upstream Lambda signal', 'Mixture strength', 'Misfire', 'Catalyzer' and/or 'Downstream Lambda signal' errors are presentContinue to Step 1
Only the 'Upstream Lambda signal', 'Mixture strength', 'Misfire', 'Catalyzer' and/or 'Downstream Lambda signal' errors are presentIdentify and eliminate the cause of the anomaly.Continue to Step 8
1ERROR DETAIL CHECKAll OKProblems metOperation
1.2 16vCheck the detail of the 'Upstream Lambda signal' errorIn particular, check that it is not 'Below minimum limit' Continue to Step 3The detail is 'Above upper limit' with error P0133, P0139 and/or P1133See table   Z57 
The detail is 'Above upper limit' with error P0133, P0139 and/or P1133See table   Z57 
The detail is 'Above upper limit' with error P0133, P0139 and/or P1133Continue to Step 2
1.6 16vCheck the detail of the 'Upstream Lambda signal' errorIn particular, check that it is not 'Open circuit or short circuit to earth'Continue to Step 3The detail is 'Signal not plausible'See table   Z57 
The detail is 'Open circuit or short circuit to earth'Continue to Step 2
1.8 16vCheck the detail of the 'Upstream Lambda signal' errorIn particular, check that it is not 'Below minimum level' Continue to Step 3The detail is 'Above maximum limit' with error P0133 and/or P0153See table   Z57 
The detail is 'Below minimum level'Continue to Step 2
2.4 20vCheck the detail of the 'Upstream Lambda signal' errorIn particular check that it is not 'Signal not valid/Below minimum threshold'Continue to Step 3The detail is 'Above upper limit' with error P0133, P0153, P0139, P0159, P1133 and/or P1153See table   Z57 
The detail is 'Below lower limit'See table   Z57 
The detail is 'Signal not valid/Below minimum threshold'Continue to Step 2
2INTAKE AND EXHAUST SYSTEM LEAKAGE CHECKAll OKProblems metOperation
Check the exhaust system visually and by listening. In particular, check that there are no leaks before the upstream Lambda sensorContinue to Step 3Leaks are presentEliminate the leaks from the exhaust system, if necessary, replace the components involved
3UPSTREAM LAMBDA SENSOR SWITCHING CHECKAll OKProblems metOperation
Use a tester to cancel the errors in the control unit.Start the engine, let it warm up and check the activation of the 1st loop mixture strength check using the diagnostic equipment (or, alternatively, the switching of the upstream Lambda signal)Continue to Step 4The activation does not take place (or the signal does not switch)Continue to Step 6
4LAMBDA SENSOR WIRING CHECKAll OKProblems metOperation
Check the upstream Lambda sensor wiring, checking that there are no false contacts See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT Continue to Step 5There are false contactsRestore correct connections. If necessary, replace the defective componentsContinue to Step 8
5ECU SOFTWARE CHECKAll OKProblems metOperation
Using the FIAT documentation, check that the engine management software calibration is updatedContinue to Step 8The control unit does not have updated software settingReprogramme the engine management control unit.Continue to Step 8
6LAMBDA SENSOR/ECU INPUT WIRING CHECKAll OKProblems metOperation
Check the wiring for the upstream Lambda sensor intake circuit in the ECU, checking that there are no short circuits to the supply or to earth, open circuits or false contacts See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT Continue to Step 7There are faulty connectionsRestore correct connections. If necessary, replace the defective componentsContinue to Step 8
7REPLACING UPSTREAM LAMBDA SENSORAll OKProblems metOperation
Replace the upstream Lambda sensor Op.   1080B60  Continue to Step 8
8DELETING AND CHECKING ERRORAll OKProblems metOperation
Use a tester to cancel the errors in the control unit.Carry out a road test and ensure the error does not recurContinue to Step 9The fault persists, it is the first time that this step has been reached and the Lambda sensor has not yet been replacedContinue 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 replacedContact Technical Support for further information on the problem
9CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis