2427642 - 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 diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters.Check 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
Other errors are presentIdentify and eliminate the cause of the problem Continue to Step 8
1ERROR DETAIL CHECKAll OKProblems metOperation
Check 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'Continue according to the instructions for the See table   Z57  UPSTREAM LAMBDA SENSOR SIGNAL ERROR
The detail is 'Open circuit or short circuit to earth'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 3There are leaksEliminate 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 components Continue to Step 8
7REPLACING UPSTREAM LAMBDA SENSORAll OKProblems metOperation
Replace the upstream Lambda sensor Op. 1080B60Continue to Step 8
8ERROR CANCELLING AND CHECKINGAll OKProblems metOperation
Use a tester to cancel the errors in the control unit.Road test the vehicle and check that the error does not occur againContinue 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
9CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis