Main task

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.