3233219 - Z51 RICH FUEL SYSTEM

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Results of the tests
1CANISTER VALVE CHECKAll OKProblems metOperation
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
2INTAKE AND EXHAUST SYSTEM LEAKAGE CHECKAll OKProblems metOperation
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 presentEliminate leaks from the system. Replace faulty parts if necessary Continue to Step 5
3PETROL PRESSURE CHECKAll OKProblems metOperation
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
4UPSTREAM LAMBDA SENSOR CHECKAll OKProblems metOperation
See table   Z56  UPSTREAM LAMBDA SENSOR SIGNAL ERROR starting from Step 3 End of diagnosis-
5DELETING 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 recur. Continue to Step 6 Fault persists Continue to Step 1
6CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'