The impeller (one) is rotated with the crankshaft and it converts the mechanical Power of the crankshaft into kinetic Electrical power by putting the fluid in motion. The TP sensor implies the throttle plate angle. If the motive force accelerates to broad-open throttle, the TCM disengages the TCC to downshift. https://torque-converter-clutch76520.full-design.com/5-simple-techniques-for-torque-converter-clutch-76378755