Torque Converter Electronics
WARNING: This page is about a different car, the 2004 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The torque converter contains a converter clutch mechanism. The converter clutch is an electronically controlled mechanism. It is engaged in fourth gear, and in third gear only when the overdrive control switch is in the OFF position, and also, in third gear over temp mode. the torque converter is not a serviceable component. It should be replaced as an assembly when: diagnosis indicates an malfunction has occurred, or when a major malfunction allows debris to enter the converter.