Crankshaft Angle Sensor

The crankshaft angle sensor, which is built into the distributor, has 2 diodes and a wave-forming circuit. When a signal rotor plate passes the space between light emitting diode (LED) and photo diode, the slit to the signal rotor plate alternately cuts the light which is sent to the photo diode from the LED. This causes an alternative voltage which is converted into an on-off pulse by the wave-forming circuit and sent to the control unit.