CVCP control
ECM regulates camshaft position based primarily on engine speed and load. A number of other values are used for minor compensations. Based on these values, ECM calculates requested camshaft position, converts it to the necessary PWM value and sends it out to the valves. A Hall sensor reads the position of the aperture discs and thereby the current position of the camshafts. ECM compares the requested and actual positions. If there is deviation, the PWM voltage to the valves is corrected.