The torque converter clutch solenoid is usually energised (trapped on) which translates to the torque converter staying normally locked. The TP sensor indicates the throttle plate angle. If the driving force accelerates to broad-open up throttle, the TCM disengages the TCC to downshift. Antique illustration of adaptor transmission gearbox. ilbusca https://torqueconverterclutch09863.blogofchange.com/34569117/the-ultimate-guide-to-torque-converter-clutch