Reluctor Ring

The reluctor ring is cast onto the crankshaft between the 3 and 4 main journals. The reluctor ring has 24 evenly spaced notches or air gaps and an additional 8 unevenly spaced notches for a total of 32.

As the crankshaft makes one complete revolution, both the A and B sensors will produce 32 ON-OFF pulses per revolution. In addition, the A sensor is positioned 27 degrees of crankshaft revolution before the B sensor. This creates a unique pattern of ON-OFF pulses sent to the ignition control module so that it can recognize crankshaft position.