Ignition System
WARNING: This page is about a different car, the 1988 Subaru RX, 1988 Subaru GL-10, 1988 Subaru GL, and 1988 Subaru DL. However, it is still accessible from the selected car via links, so may be relevant.
The ignition system consists of a distributor containing a crank-angle sensor, an ignition coil equipped with a power transistor, and SPFI control unit. The crank-angle signal and reference signal detected by crank-angle sensor are sent to SPFI control unit.
The SPFI control unit determines optimum ignition timing from these signals and other engine operating parameters. It then transmits an ignition signal to ignition coil ignitor. The ignitor amplifies this ignition signal and causes primary current to trigger in ignition coil.