In my automatic transmission 1995 Daihatsu Hijet S110P with 4wd, there is a transmission computer mounted behind the steering wheel and instrument/gauge cluster. As some of you might have already read, my Hijet (and others with automatic hijets) get crappy acceleration and feel like they're stuck in third gear and never change unless you go to L on the shifter. You can clean the transmission solenoids, you can replace the transmission fluid, you can replace all of the fuel system components, and the car's acceleration does not improve. Well, I just took out my truck's transmission control computer and drove around for a while. It performs _exactly the same_ as with the computer plugged in. It being broken would explain why my PWR button does nothing and why it never seems to shift into gears beyond third. What do I do with this information? How do I test if this thing is actually working? It doesn't appear to be serviceable at all, but I could pry off the backplate (and probably break it). -- Jan 12, 2022 edit: I believe we have solved this issue. Read the thread for more details, but you need to replace the capacitors on your transmission control computer. This fixes issues with the transmission computer not shifting on its own, and the PWR button not functioning.