The TP sensor suggests the throttle plate angle. If the motive force accelerates to broad-open throttle, the TCM disengages the TCC to downshift. This fluid coupling enables the engine to continue operating regardless if the automobile is stationary, blocking it from stalling and boosting torque when accelerating from the stop. https://torque-converter-clutch37924.blogitright.com/34106271/the-torque-converter-clutch-diaries