In the event the clutch is disengaged, the torque converter allows the motor to rotate without the need of stalling. Although the car or truck is slowing and approaching a quit, the TCC's application is undesirable. Just like the clutch over a manual transmission, it triggers the engine to stall. https://torque-converter-clutch97306.boyblogguide.com/33254125/considerations-to-know-about-torque-converter-clutch