Acura NSX 1997 Service Manual page 390

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In position and position (2nd, 3rd, and 4th gear), pressurized fluid is drained from the back of the torque converter
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 TCM optimizes the timing of
the lock-up system. Under certain conditions, the lock-up operation is applied during deceleration, in
3rd, and 4th gear), and in
The lock-up shift valve controls the range of lock-up according to lock-up control solenoid valves A and B, and throttle
valve B. When lock-up control solenoid valves A and B activate, modulator pressure changes. Lock-up control solenoid
valves A and B are mounted on the torque converter housing, and are controlled by the TCM.
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position (3rd and 4th gears).
position in (2nd,