Full Lock-up

When the vehicle speed increases, the PCM sends a signal to the A/T clutch pressure control solenoid valve C to increase LS C pressure (58). The LS C pressure (58) is applied to the lock-up control valve and the lock-up timing valve, and moves them to the left side. Under this condition, torque converter back pressure is released fully, causing the torque converter clutch to be fully engaged.

Fig 1: Torque Converter Clutch Lock-Up Diagram - Full Lock-Up

Courtesy of AMERICAN HONDA MOTOR CO., INC.