SL Solenoid
WARNING: This page is about a different car, the 2002 Toyota Land Cruiser, 2002 Lexus LX 470, 2001 Toyota Land Cruiser, and 2001 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
ECM controls torque converter clutch lock-up by delivering an output signal to SL solenoid. SL solenoid is activated when gearshift lever is in "D" position and vehicle is at specified speed. SL solenoid is located on transmission valve body. See Figure.