I constantly endorse you clear away the torque converter with the transmission to diagnose it adequately. Modern day torque converters have Digital control of the clutch operation. The pressure from the torque converter clutch is regulated by way of a key regulator valve that is piloted by a solenoid (see https://augustzkpst.buyoutblog.com/34214614/not-known-factual-statements-about-torque-converter-clutch