This transmission has some unique problems that can cause you to scratch your head. Add the lack of information available from the manufacturer and your frustration level can skyrocket. Here are some common problems and suggestions on how to resolve them.
I find any articles or training related to the topic of re-flashing or reprogramming computers to be of great interest and a great help to me and to all transmission technicians because it has become a very prominent repair procedure. In fact, looking through the past 10 years of OE bulletins, I find that the ratio of actual repairs versus computer reprogramming has changed dramatically, totally favoring computer reprogramming.
Toyota vehicles using either the U140 or 240 series transmissions (see Figure 1) are known to produce a brutal 2-3 shift, to the point that the direct clutch disintegrates and spreads debris into the system, taking out the drum and cover (see Figure 2).