Crankshaft Position Sensor
The crankshaft position sensor is mounted on the bottom of the DIS ignition module or near to the ignition module. See Fig 1 & Figure The sensor protrudes into the engine block and is mounted within .050" (1.3 mm) of the crankshaft reluctor. Sensor position is not adjustable.
The reluctor is a special piece of metal cast with the crankshaft. It has 7 slots machined into it, 6 of which are equally spaced (about 60 degrees apart). A seventh slot is spaced about 10 degrees from one of the other slots and generates a synchronization pulse signal. As reluctor rotates, the slots change the magnetic field to the sensor, creating an induced voltage.