| | Results
of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|
| Connect
the diagnostic equipment (Examiner or Examiner Plus) and record
the errors and environmental parameters.Check for the 'Upstream Lambda signal' error only | | Only the 'Upstream Lambda
signal', 'Mixture strength', 'Misfire', 'Catalyzer' and/or 'Downstream Lambda
signal' errors are present | Continue to Step 1 |
| Identify and eliminate the cause of the anomaly. | Continue to Step 8 |
| 1 | CHECK | All OK | Problems met | Operation |
|---|
| Check
the detail of the 'Upstream Lambda signal' errorIn particular check that it is not 'Signal not valid/Below minimum
threshold' | Continue to Step 3 | The detail is 'Above upper limit'
with error P0133, P0153, P0139, P1133 and/or P1153 | See table Z57 |
| The detail is 'Below the lower limit' | See table Z57 |
| The detail is 'Signal not valid/Below minimum threshold' | Continue to Step 2 |
| 2 | INTAKE AND EXHAUST SYSTEM LEAKAGE
CHECK | All
OK | Problems
met | Operation |
|---|
| Check
the exhaust system visually and by listening. In particular, check
that there are no leaks before the upstream Lambda sensor | Continue to Step 3 | There are leaks | Eliminate the leaks from
the exhaust system, if necessary, replace the components involved |
| 3 | UPSTREAM LAMBDA SENSOR SWITCHING
CHECK | All
OK | Problems
met | Operation |
|---|
| 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 4 | The activation does not
take place (or the signal does not switch) | Continue to Step 6 |
| 4 | LAMBDA SENSOR WIRING CHECK | All OK | Problems met | Operation |
|---|
| Check
the upstream Lambda sensor wiring, checking that there are no false
contacts See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT | Continue to Step 5 | There are false contacts | Restore correct connections.
If necessary, replace the defective componentsContinue
to Step 8 |
| 5 | ECU SOFTWARE CHECK | All OK | Problems met | Operation |
|---|
| Using
the FIAT documentation, check that the engine management software
calibration is updated | Continue to Step 8 | The control unit does
not have updated software setting | Reprogramme the engine management control unit.Continue
to Step 8 |
| 6 | LAMBDA SENSOR/ECU INPUT WIRING CHECK | All OK | Problems met | Operation |
|---|
| 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 7 | There are faulty connections | Restore correct connections.
If necessary, replace the defective componentsContinue
to Step 8 |
| 7 | REPLACING UPSTREAM LAMBDA SENSOR | All OK | Problems met | Operation |
|---|
| Replace
the upstream Lambda sensor Op. 1080B90 | Continue to Step 8 | - | |
| 8 | 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 9 | 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 |
| 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 |
| 9 | 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' |