The control of the oil pressure during the lock-up clutch is finished via two valves: the relay valve and also the signal valve. In this type of arrangement the sign valve controls the force on a person aspect in the relay valve, which controls the force within the lock-up clutch. https://hectoryjpuw.bloggerswise.com/41650380/the-single-best-strategy-to-use-for-torque-converter-clutch