Torque Converter Clutch And Select Control Valve Control

Lock up Released

In the lock up released state, the torque converter clutch control valve is set into the unlocked state by the torque converter clutch solenoid valve and the lock up apply pressure is drained.

In this way, the torque converter clutch piston is not coupled.

Lock up Applied

In the lock up applied state, the torque converter clutch control valve is set into the locked state by the torque converter clutch solenoid valve and lock up apply pressure is generated.

In this way, the torque converter clutch piston is pressed and coupled.

Select Control

When shifting between "N" ("P") → "D" ("R"), optimize the operating pressure on the basis of the throttle position, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.