Torque Converter Clutch Control Valve Control

LOCK UP CONTROL SYSTEM DIAGRAM

Fig 1: Lock-Up Control System Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

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 and the lock up apply pressure is drained and the torque converter clutch piston release pressure is generated.

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 and lock up apply pressure is generated and the torque converter clutch piston release pressure is drained.

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