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Main task: Notes

The CDM does an initial signal processing of the ionization signals from each ignition coil. The CDM transmits the following three signals to the ECM:

Knock signal
Combustion signal 1 (cylinders 1 and 3)
Combustion signal 2 (cylinders 2 and 4)

These signals are used for knock control, synchronization of ignition timing/fuel injection and for misfire detection.