Electronic Ignition (EI) System: Notes

Electronic (direct) ignition system uses one coil per cylinder. Individual coils are plugged directly onto spark plugs. Camshaft Position and Crankshaft Position (CKP) sensors monitor engine speed, No. 1 cylinder at TDC and piston location. Signals created by the sensors are sent to the PCM for processing. PCM then delivers ignition signals to the power transistor (integral with ignition coil) to control ignition by triggering the appropriate ignition coil. Power for ignition coils is supplied via fused ignition circuit.