Torque Converter Clutch Control Valve Control

Lock-up Control System Diagram

Fig 1: Lock-Up Control System Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

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.

  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.

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