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 converter pressure (94) from the left side of the torque converter is completely released 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.
NOTE:
When used, "left" or "right" indicates direction on the hydraulic circuit.