Not sure what the initials stand for but its basically a sensor that detects the exact position of the crankshaft (engine) rotation so the spark plugs are fired at exactly the right moment. Similar in effect to the old fashioned timing lights used to check ignition timing using a strobe light except it sends a signal to the ECU which can constantly alter timing to maintain maximum efficiency in all circumstances. OP needs a reader that can communicate with the ecu and reset the calibration. Sorry I dont know of any.
In the good old days (1920's ) the driver could manually alter the ignition advance and retard using a lever on the steering wheel ,often while driving, until you could feel the engine was running better. You made regular alterations as the ideal setting varied with circumstances. They often had a second lever operating as a hand throttle - cruise control! Then ,until 1980's timing was altered automatically using spinning bobs in the distributor - a bit like those spinning regulators on steam engines. The results were a bit of a compromise. Now technology has finally caught up with the 1920's.
.