Misfiring Detection

Misfiring detection
Misfiring causes irregularities in the rotational speed of the crankshaft. These irregularities can be detected by way if changes in the segment time.

Segment times (time, in which a certain number of teeth on the increment wheel move past the sensor) are constantly determined via the reference mark sensor (= crankshaft sensor). These segment times are constantly checked during engine operation. In the event of a fault, a defect code is stored and injection of the corresponding cylinder is deactivated.


NOTE: Sensor wheel adaptation must be carried out after replacing a DME control unit or incremental wheel. If only the incremental wheel is replaced, first the sensor-wheel adaptation must be deleted (disconnect control unit from power supply for 5 minutes). Sensor-wheel adaptation is implemented automatically as soon as the engine is operated in overrun condition for at least 10 seconds. See sensor-wheel adaptation.