The torque converter clutch solenoid is always energised (trapped on) which interprets into your torque converter remaining generally locked. The TP sensor implies the throttle plate angle. If the motive force accelerates to large-open throttle, the TCM disengages the TCC to downshift. Antique illustration of adaptor transmission gearbox. ilbusca / https://torque-converter-clutch42963.thezenweb.com/rumored-buzz-on-torque-converter-clutch-72020099