Ignition System - Electronic: Operation
Whenever the ignition 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.
As the teeth of the armature pass the pegs of the pick-up coil, a signal is sent to the control module (ignitor). The module then breaks the primary circuit in the coil. This causes a high voltage surge in the coil secondary circuit. This high voltage is required to fire the spark plugs.
NOTE:
For wiring schematic of Mitsubishi models with Turbo engines and ECI, see the appropriate article in COMPUTERIZED ENGINE CONTROLS section.