Ignition System: Description and Operation

- This action induces a high voltage in the secondary winding of the ignition coil. The secondary winding current produced flows from the ignition coil through the distributor and spark plug to ground, thus causing ignition in each cylinder.
- When the ignition switch in turned to ON, battery positive voltage is applied to the ignition coil primary winding.
- As the distributor shaft rotates, ignition signals are transmitted from the engine control module to the ignition power transistor.
- These signals activate the ignition power transistor to cause ignition coil primary winding current to repeatedly flow through the ignition coil negative terminal through the ignition power transistor to ground or to be interrupted.