Statistics, Fault Processing
Within an interval of 1000 crankshaft revolutions the detected misfiring events are added for each cylinder. If the sum of all cylinder misfire incidents exceeds a predetermined value, a pending code for emission relevant misfiring is stored. If only one cylinder is misfiring, a cylinder specific fault code is stored. If more than one cylinder is misfiring, the fault code for multiple misfiring is also stored.
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 by a load and speed-dependent map.
If the sum of cylinder misfire events exceeds a predetermined value the fault code for catalyst damage relevant misfiring is stored and the MIL is illuminated at once (blinking).
If the cylinder selective count exceeds the predetermined threshold the following measures take place:
- the fuel control switches from closed-loop to open-loop operation
- a cylinder specific fault code is stored. If more than one cylinder is misfiring, the fault code for multiple misfire is also stored
- the fuel supply to the respective cylinder is cut-off
All misfire counters are reset after each interval.
Statistics: Fault Processing