Lock-up Control
The torque converter clutch solenoid valve controls the hydraulic pressure to switch the lock-up shift valve and lock-up ON and OFF. The PCM actuates the torque converter clutch solenoid valve and the A/T clutch pressure control solenoid valve ON, the condition of the lock-up starts. The A/T clutch pressure control solenoid valve C regulates and apply the hydraulic pressure to the lock-up control valve to control the amount of the lock-up.
The lock-up mechanism operates in the [D 5 ] position (3rd, 4th, and 5th), in the [D 4 ] position (3rd, and 4th), and in the [D 3 ] position (3rd).