Catalyst damage:

Within an interval of 200 crankshaft revolutions the detected number of misfiring events is weighted and calculated for each cylinder. The weighting factor is determined using a load/speed dependent map.

If the sum of cylinder misfire incidents exceeds a predetermined value a fault code is stored and the MIL is illuminated at once.

If the cylinder selective count exceeds the predetermined threshold the following measures take place:

• the fuel control system is switched from closed-loop to open-loop operation
• the cylinder selective fault code is stored
• if more than one cylinder is misfiring the fault codes for all individual cylinders and for multiple cylinders will be stored
• the fuel supply to the respective cylinder is cut-off