Ignition System - TOYO DENSO Electronic: Operation
As the reluctor turns, its teeth come in line with the 2 upright teeth of stator. As the reluctor approaches and passes the stator teeth, variations occur in the magnetic field around them. This causes the pick-up coil to signal the ignitor.
As these signals are received, transistors inside the ignitor are turned off and on. This results in a magnetic field building up and collapsing in the primary circuit of the ignition coil.
When this field collapses, a voltage surge occurs in the secondary circuit of the ignition coil. A high voltage spark is then fed from the coil, through the distributor rotor and cap, to the secondary wiring and spark plugs.