9-3 (9440) L4-2.0L Turbo (2007)
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Ignition Coil: Description and Operation
Ignition Coil With Integrated Power Stage (320)
Location
Ignition coil with integrated power stage, cyl 1 (320a)
Ignition coil with integrated power stage, cyl 2 (320b)
Ignition coil with integrated power stage, cyl 3 (320c)
Ignition coil with integrated power stage, cyl 4 (320d)
Main task
An ignition coil has the following tasks:
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Generate the high-voltage spark that starts the combustion.
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Together with the spark plug, measure ionization current.
These signals are used for knock control, synchronisation of ignition timing/fuel injection and for misfire detection.
Type
Inductive ignition coil with integrated power stage and circuits for ionization current measurement.
