The TP sensor implies the throttle plate angle. If the driver accelerates to wide-open up throttle, the TCM disengages the TCC to downshift. This fluid coupling allows the motor to continue functioning regardless if the vehicle is stationary, avoiding it from stalling and boosting torque when accelerating from the cease. https://emiliowxvrp.glifeblog.com/32950146/the-smart-trick-of-torque-converter-clutch-that-nobody-is-discussing