Torque Converter Clutch (TCC) Solenoid
WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The torque converter clutch (TCC) solenoid is a pulse width modulating type solenoid which is used to control the apply and release of the TCC.