3233222 - 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 1 Faults in the electrical circuit Restore the correct connections See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT and if necessary replace the faulty components Continue to Step 10
1IGNITION COIL CHECKAll OKProblems metOperation
Visually check, via the spark gap of Examiner 1.806369000, the operation of the coil connected to the cylinder concerned.In particular, check that the spark is regular Continue to Step 2 The coil spark is not regular Continue 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/broken Continue to Step 3 Spark plug faulty Replace the spark plug Op.   5510D10  Continue to Step 10
3CHECKING FUEL PRESSUREAll OKProblems metOperation
Carry out a fuel pressure test (see in Op. 0510C10), by turning the ignition on and waiting 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. Place a container under the injector flute Continue to Step 6 Pressure is too low: constrictions on the supply pipeRepair or if necessary replace the pipe Continue to Step 10
Excessive pressure drops after switch-off Continue to Step 4
Low pressure: faults in the fuel pump unit Replace the fuel pump assembly Op.   1040A70  Continue to Step 10
4CHECK INJECTOR SEALAll OKProblems metOperation
Turn the ignition on and after a few seconds turn it off again.Check that there are no fuel leaks from the injector concernedRefit the injector flute
Work very carefully and in safe conditions
 Continue to Step 5 The injector leaks Replace 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. Continue to Step 7 Injector stuck shut Replace the injector Op.   1056B70  Continue to Step 10
7CYLINDER COMPRESSION CHECKAll OKProblems metOperation
Carry out the cylinder compression test Op.   0510A10  Continue to Step 10 Compression insufficient for the cylinder involved Continue to Step 8
8CHECKING 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 Continue to Step 10
Cylinders/piston rings wornRepair the leak Continue to Step 10
9COIL REPLACEMENTAll OKProblems metOperation
Exchange the coil concerned with one from another cylinder Op.   5510C14  and check, using the spark gap of Examiner 1.806.369.000, that the spark is regular Continue to Step 10 There is no regular spark Renew the old coil and replace the engine management control unit Op.   1056B82  Continue to Step 10
10DELETING 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 11 Anomaly persists. This step has already been reached once or twice before and the control unit has not yet been replaced Continue 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
11CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'