Lock-Up Control

Shift solenoid valve E controls the hydraulic pressure to switch the lock-up shift valve ON and OFF. When the PCM actuates shift solenoid valve E and A/T clutch pressure control solenoid valve A, lock-up starts. A/T clutch pressure control solenoid valve A applies and regulates hydraulic pressure to the lock-up control valve to control the amount of lock-up.

The lock-up mechanism operates in D (2nd, 3rd, 4th, and 5th gears), and in D3 (2nd and 3rd gears).

Fig 1: Identifying Lock Up Control Of Automatic Transmission

Courtesy of AMERICAN HONDA MOTOR CO., INC.