Stealth R/T V6-2972cc 3.0L DOHC (1991)
Crankshaft Position Sensor: Description and Operation
Component Location
The Crank Angle Sensor and the Top Dead Center Sensor are located within their own housing on the back of the front cylinder head. These sensors are
incorporated into one unit, there is 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. As the distributor shaft rotates the slits at the discs edge pass between the light and the optical reading part of the unit. The light emitted from the
luminous diodes pass through the slits to the photo sensing diodes. When the photo diodes receive the light, they become conductive and generate a
signal, which is sent to the Multi-Point Injection (MPI) Control Unit.
