Acura 3.5 RL Manual page 503

In position in 2nd, 3rd and 4th, and
through a passage, causing the lock-up piston to be held against the torque converter cover. As this takes place, the main-
shaft rotates at the same speed as the engine crankshaft. Together with hydraulic control, the PCM optimizes the timing of
the lock-up system. Under certain conditions, the lock-up clutch is applied during deceleration in 3rd and 4th gear.
The lock-up system controls the range of lock-up according to torque converter clutch (lock-up control) solenoid valves A
and B, and the throttle valve. When torque converter clutch solenoid valves A and B activate, modulator pressure
changes. Torque converter clutch solenoid valves A and B are mounted on the torque converter housing, and are con-
trolled by the PCM.
NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.
position in 3rd, pressurized fluid is drained from the back of the torque converter