Swift DOHC

The ignition system consists of an ignition coil, a distributor containing a P/M generator crank angle sensor, trigger wheel and rotor, and an ignition power unit which opens and closes ignition coil primary circuit based upon signals from ECM. When power unit removes the ground circuit from primary ignition, the magnetic field around ignition coil windings collapse. This produces an induced high voltage surge which is used to fire spark plugs.

Power for ignition coil is provided from fuse box 20-amp ignition fuse when ignition switch is in ON position. Tachometer signal generated by triggering of ignition coil is monitored by ECM at terminal A12 after signal passes through a noise suppressor filter.