Full Lock-up

When the vehicle speed increases, the PCM sends a signal to A/T clutch pressure control solenoid valve A to increase A/T clutch pressure control solenoid valve A pressure (55), and the lock-up control valve is moved to the left side by the increased pressure. Then torque converter pressure (94) from the left side of the torque converter is completely released fully at the lock-up control valve, and torque converter pressure (91) engages the torque converter clutch securely; the torque converter clutch is in full lock-up.

Fig 1: Hydraulic Circuit - Full Lock-Up

Courtesy of AMERICAN HONDA MOTOR CO., INC.