184000604 - 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 openContinue to Step 2Canister valve stuck openRepair 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 systemsContinue to Step 3There are leaksEliminate leaks from the system. Replace faulty parts if necessaryContinue 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 4High pressure: fuel pressure regulator setting not correctReplace the fuel pupm Op. 1040A70 Continue to Step 5
The pressure falls by more than 1 bar in the established time: faulty injectorsRenew 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 regulatorReplace 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 pumpReplace the fuel pupm Op. 1040A70 Continue to Step 5
4UPSTREAM LAMBDA SENSOR CHECKAll OKProblems metOperation
Continue as instructed See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR , starting from Step 3End of diagnosis.
5ERROR 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 6The fault persistsContinue to Step 1
6CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.