October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Main task

The CDM does an initial signal processing of the ionization signals from each ignition coil. The CDM transmits 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.