2398917 - Z54 MISFIRE ERROR IN ONE CYLINDER

The diagnostic equipment signals the following error: Misfire in cylinder X
Carry out the procedure for the circuit for the cylinder in which the error was detected
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Check that the ignition circuit is correctly connected and working properly, paying particular attention to:

Continue to Step 1Faults in the electrical circuitRepair the connections See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT If necessary, replace the faulty components.Continue to Step 10
1IGNITION COIL CHECKAll OKProblems metOperation
Via the check See Test   5510CC  Check operation of ignition coils' , test the operation of the coil connected to the relevant cylinder.In particular, check that the spark is regularContinue to Step 2The coil spark is not regularContinue to Step 9
2SPARK PLUG CONDITION CHECKAll OKProblems metOperation
Check that the electrode gap for the spark plug concerned is within the permissible limits. Also check that the electrodes are not worn/brokenContinue to Step 3Spark plug faultyReplace the spark plug Op.   5510D10  Continue to Step 10
3CHECK ON FUEL PRESSUREAll OKProblems metOperation
Test the fuel pressure Op. 5510C10by turning the ignition ON and waiting for a few seconds.Start the engine normally and after a few seconds turn the ignition off.Check that the pressure remains at normal values and that it has not fallen by more than 1.5 bar 15 minutes after the engine has been turned off.Remove the injector flute complete with all the injectors Op. 5510C10Place a container under the injector flute.Continue to Step 6Pressure is too low: constrictions on the supply pipeRenew or, if necessary, replace the pipe.Continue to Step 10
Excessive pressure drops after switch-offContinue to Step 4
Low pressure: faults in the fuel pump unitReplace the fuel pump assembly Op.   1040A70  Continue to Step 10
4CHECK INJECTOR SEALAll OKProblems metOperation
Remove the injector flute complete with all the injectors Op.   1056B60  Place a container under the injector flute.Turn the ignition on and after a few seconds turn it off again.Check that there are no fuel leaks from the injector concerned. Refit the injector flute Op.   1056B60 
Work very carefully and in safe conditions
Continue to Step 5The injector leaksReplace the injector Op.   1056B70  Continue to Step 10
5REPLACING FUEL PUMPAll OKProblems metOperation
Replace the fuel pump assembly Op.   1040A70  Continue to Step 10
6INJECTOR ACTIVE DIAGNOSISAll OKProblems metOperation
Carry out active diagnosis on the injector concerned, checking that during activation there is spray from the injector. Refit the injector flute Op.   1056B60  Continue to Step 7Injector stuck shutReplace the injector Op.   1056B60  Continue to Step 10
7CYLINDER COMPRESSION CHECKAll OKProblems metOperation
Carry out the cylinder compression test Op.   0510A10  Continue to Step 10Compression insufficient for the cylinder involvedContinue to Step 8
8CHECK ON CAUSE OF INSUFFICIENT COMPRESSIONAll OKProblems metOperation
Carry out R/R on head to check the valve sealCheck the condition of the cylinders/piston ringsEnd of diagnosisInsufficient valve sealOverhaul the cylinder head Op.   1016E10  Continue to Step 10
Cylinders/piston rings wornRenew the seal.Continue to Step 10
9COIL REPLACEMENTAll OKProblems metOperation
Exchange the coil concerned with one from another cylinder and check via the check See Test   5510CC  Check operation of ignition coils' that the spark is regular Continue to Step 10There is no regular sparkRenew the old coil and replace the engine management control unit Op.   1056B82  Continue to Step 10
10ERROR 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 11The fault persists, it is the first or the second time that this Step has been reached and the control unit has not yet been replacedContinue to Step 0
The fault persists, but it is the third time that this step has been reached or the control unit has already been replacedContact Technical Support for further information on the problem
11CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis