The control of the oil tension from the lock-up clutch is done via two valves: the relay valve and the signal valve. In such a arrangement the signal valve controls the stress on 1 side with the relay valve, which controls the force within the lock-up clutch. By default, both https://martinvzaax.daneblogger.com/33316612/the-2-minute-rule-for-torque-converter-clutch