MITSUBISHI Electronic Ignition System: Operation

Whenever the ignition switch is "ON", the primary circuit of the ignition coil is energized. As the distributor shaft rotates, the armature (reluctor) rotates inside the magnetic pick-up coil (stator) assembly. See Figure. As the teeth of the armature pass the pegs of the pick-up coil and breaker plate assembly, a signal is sent to the control module (ignitor). The module then breaks the primary circuit in the coil, inducing high voltage in the secondary circuit firing the spark plugs.