Additional Signals, Automatic Transmission, Checking: Function
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
The Transmission Control Module (TCM) J217 receives information from the components that affect the shifts and forwards this information to the pressure regulator valves of the valve body, which control the slide valves in the valve body.