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Home >> Saab >> 2004 >> 9-3 Arc, 2D Convertible, Standard >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Control Module >> Technical Description >> Ionization Detection Module (740) >> Main task
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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:

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

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