Modern day torque converters use electro hydraulic Regulate with the lock-up clutch. The hydraulic circuit which locks/unlocks the torque converter clutch is managed using hydraulic valves. The valves are actuated instantly or indirectly by solenoids. Visual Inspection:  Get started with a fundamental visual inspection. Search for any indications of leaks https://torqueconverterclutch93691.blogcudinti.com/34090201/what-does-torque-converter-clutch-mean