Eclipse L4-1795cc 1.8L SOHC (1990)
Camshaft Position Sensor: Description and Operation
Top Dead Center (TDC) Sensor Circuit
The Crank Angle Sensor and the Top Dead Center Sensor are located within the distributor housing. These sensors are incorporated into one unit, being
a disc and a pick-up unit. The disc is affixed to the distributor shaft and the light-transmitting unit is mounted stationary to the distributor housing.
Crank Angle And #1 TDC Sensor
The disc contains 4 large slits around its circumference to indicate the crankshaft angle. An additional light-transmission slit located inward from the
edge is used to indicate number one cylinder's top dead center position. The pick-up unit assembly uses two luminous diodes and two photo diodes, in
order to detect the two different slits. There is a very slight clearance between the luminous diodes and the photo diodes, and the disc rotates within this
space.
