Electronic Ignition System

Ignition system consists of a distributor, which uses a signal generator (signal rotor and pick-up coil/Camshaft Position (CMP) sensor), ignition control module and external coil to control fuel combustion by providing a spark to ignite compressed air/fuel mixture at correct time. Power for ignition coil is provided through the ignition switch.

As rotating signal rotor passes pole piece of pick-up coil, a reference signal is sent from the ignition control module to the ECM. The ECM uses reference signal to determine when to signal ignition control module to open ground circuit for primary ignition.

When ignition control module opens ground circuit for primary ignition, magnetic field around ignition coil windings collapses, producing an induced high voltage surge used to operate the spark plugs.