| | 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
| Leaks are present | Eliminate leaks from the
system. Replace faulty parts if necessary
Continue
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 pump
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 pump
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 pump
Op. 1040A70
Continue
to Step
5
|
| 4 | UPSTREAM LAMBDA SENSOR CHECK | All OK | Problems met | Operation |
|---|
| See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
starting
from Step 3
| End of diagnosis | - | |
| 5 | DELETING AND CHECKING ERROR | All OK | Problems met | Operation |
|---|
| Use
a tester to cancel the errors in the control unit.Carry out a road test and ensure the error does not recur. |
Continue to Step
6
| Fault persists |
Continue to Step
1
|
| 6 | CHECKING CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Check
that the fault is no longer present | End of diagnosis | Fault persists | Search for the
fault starting from another symptom' |