Scoupe L4-1468cc 1.5L SOHC (8 VALVE) (1991)
Crankshaft Angle Signal:
The four slits located at the outer circumference of the disc serve to detect the position of the crankshaft (and, therefore, the piston) relative to top dead
center. The ECU, based on this signal, determines the fuel injection timing, and also calculates the amount of intake-air, the timing of the ignition signal,
etc. for each revolution of the engine.