Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) controls the 6 individual coil assemblies using reference pulses from the crankshaft position (CKP) sensor and other sensor inputs. Ignition 1 voltage is applied to the ignition coil assemblies when the ignition switch is in the ON or START positions. The ignition control module within each coil assembly toggles the primary windings, inducing a high voltage in the secondary windings. The high voltage induced in the secondary windings of the ignition coils is applied through the coil boots to the spark plugs.