Electronic Ignition System

Ignition system circuit consists of a battery, distributor, ignition switch, spark plugs, igniter, and primary and secondary wiring. An Ignition Control (IC) system is used that is monitored and controlled by the ECM/PCM. An ignition noise suppressor condenser is also used.

Distributor uses a signal generator (signal rotor and pick-up coil/Camshaft Position (CMP) sensor) and rotor to produce reference signals to the ECM/PCM. Ignition coil and igniter are mounted inside distributor. Power for ignition coil is provided through the ignition switch. As rotating signal rotor passes pole piece of pick-up coil/CMP sensor, a reference signal is sent to the ECM/PCM. ECM/PCM uses this signal to determine when to signal igniter to open ground circuit for primary ignition.

When igniter 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. Igniter sends a signal back to ECM to confirm primary ignition circuit operation was completed.