For procedures on the position sensors, the 2 crankshaft sensors are located on the front of the engine block, between cylinder Numbers 4 and 6. Crankshaft position A sensor is situated on the upper crankcase, while crankshaft position B sensor is found in the lower crankcase. Both sensors extend into the crankcase and are sealed into the engine block with 0-rings, and they are not adjustable. The magnetic crankshaft position sensors operate similarly to the pick-up coil in a distributor; when a piece of steel, known as the reluctor, moves repeatedly over the sensor, a voltage is generated that appears as an ON-OFF signal, akin to the signal produced by breaker points in a distributor as they open and close. The reluctor ring is cast onto the crankshaft between the No. 3 and No. 4 main bearing journals, featuring 24 evenly spaced notches and an additional 8 unevenly spaced notches, totaling 32 notches. As the crankshaft completes one revolution, both A and B sensors produce 32 ON-OFF pulses per revolution, with the "A" sensor positioned 27 degrees of crankshaft revolution before the B sensor, creating a unique pattern of ON-OFF pulses for the
Ignition Control Module to recognize crankshaft position.