Pickup 4WD V6-2972cc 3.0L SOHC (1991)
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.
Distributor Exploded View
The disc contains 360 slits around its circumference to indicate the crankshaft angle. An additional six light-transmission slits located 60° apart located
inward from the edge are 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 be able 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. As the distributor shaft rotates the slits at the discs edge pass between the light and the optical reading part of the unit.
