3360353 - Z52 LEAN FUEL SYSTEM

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Results of the tests
1INTAKE AND EXHAUST SYSTEM LEAKAGE CHECKAll OKProblems metOperation
Check the intake and exhaust system visually and by listening, to check that there are no leaks downstream of the MAP sensor/flow meter.

Also take into account:

  • blow-by circuit;
  • canister circuit, checking that the valve is not stuck open;
  • brake servo vacuum pipes;
  • Injector O-Rings
Continue to Step 2Leaks are presentEliminate leaks from the system. Replace faulty parts if necessaryContinue to Step 5
2PETROL PRESSURE CHECKAll OKProblems metOperation
Turn the key to MAR and check fuel pump activates.While the pump is active, check fuel pressure is not too lowContinue to Step 3Low pressure: fuel filter blocked/obstructedReplace the fuel pump Op.   1040A70  Continue to Step 5
Low pressure: fuel filter blocked/obstructedRenew or, if necessary, replace the pipes involved
Low pressure: fuel filter blocked/obstructedReplace the fuel pump Op.   1040A70  Continue to Step 5
Low pressure: fuel filter blocked/obstructedReplace the fuel pump Op.   1040A70  Continue to Step 5
Low pressure: fuel filter blocked/obstructedRestore correct connections See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT If necessary, replace the fuel pump Op.   1040A70  Continue to Step 5
Low pressure: fuel filter blocked/obstructedReplace the fuel pump Op.   1040A70  Continue to Step 5
3CHECKING FUEL QUALITYAll OKProblems metOperation
Check that there is no water or other substances in the tank which are contaminating the fuel.Continue to Step 4Impurities are presentClean the tank Op. 1040A24and introduce new fuel. Continue to Step 5
4UPSTREAM LAMBDA SENSOR CHECKAll OKProblems metOperation
Continue as instructed in Table Z056, starting from Step 3End 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 6The fault persistsContinue to Step 8
6CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis