| | Results of the tests |
| 1 | CANISTER VALVE CHECK | All OK | Problems met | Operation |
|---|
| Check that the canister valve is not stuck open | Continue to Step 2 | Canister valve stuck open | Repair or, if necessary, replace the canister Op. 1080E20 Continue to Step 5 |
| 2 | INTAKE AND EXHAUST SYSTEM LEAKAGE CHECK | All OK | Problems met | Operation |
|---|
| Check the blow-by circuit, visually checking that there are no leaks from the engine sump to the intake circuit.Also check, visually and by listening, that there are no leaks from the intake and exhaust systems | Continue to Step 3 | There are leaks | Eliminate leaks from the system. Replace faulty parts if necessaryContinue to Step 5 |
| 3 | PETROL PRESSURE CHECK | All OK | Problems met | Operation |
|---|
| Turn the key to MAR and check that fuel pump activates.While the pump is active, check fuel pressure is not too high.Turn the ignition off and check that the pressure does not fall by more than 1 bar over a period of 15 minutes. | Continue to Step 4 | High pressure: fuel pressure regulator setting not correct | Replace the fuel pupm Op. 1040A70 Continue to Step 5 |
| The pressure falls by more than 1 bar in the established time: faulty injectors | Renew the correct seal for the injectors, if necessary replace them Op. 1056B70 Continue to Step 5 |
| The pressure falls by more than 1 bar in the established time: leaks from the fuel pressure regulator | Replace the fuel pupm Op. 1040A70 Continue to Step 5 |
| The pressure falls by more than 1 bar in the established time: leaks from the non-return valve on the fuel pump | Replace the fuel pupm Op. 1040A70 Continue to Step 5 |
| 4 | UPSTREAM LAMBDA SENSOR CHECK | All OK | Problems met | Operation |
|---|
| Continue as instructed See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR , starting from Step 3 | End of diagnosis | . | |
| 5 | 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 6 | The fault persists | Continue to Step 1 |
| 6 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Check that the fault is no longer present | End of diagnosis | . | |