How to change and replace automatic transmission fluid (ATF) on a 2005 Toyota Scion TC. This video shows the simple process of draining and refilling transmission fluid from the ATF reservoir on the Scion TC. The process is as about as simple as changing oil. In the video I describe how to locate the drain plug on the ATF tank, drain the old transmission fluid from the tank, and refill the chamber with new transmission fluid through the ATF dipstick plumbing.