Torque Converter Clutch Solenoid Valve
WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
TCC solenoid valve is controlled by TCM. Solenoid is closed when off. TCC piston is designed to slip to adjust ratio of engagement, reducing lock-up shock.