Mitsubishi ECU Up for sale is a Working, in excellent condition Mitsubishi Diamante Transmission control TCU / ECU. Should fit most 1997, 1998 & 1999 models. perhaps others as well. See part numbers at the top of the listing and check this Vs your original number to be sure if this is correct for your car. This unit offers a 30 day functionality warranty.As always with this type of component your best bet is to match the part number to the one on your original ECU. A faulty TCU can mimic the symptoms of a failed transmission, even though there is no physical problem with the transmission. Don't replace the transmission or worse- junk the car over something like this. Try replacing this first.If your car does not have these issues but you intend to keep it a while, I recommend our customers keep an extra ECU in the trunk. These units now have to be special ordered from most dealers new for big $$ (often times over $1000!), and you can never find one when you need one. Even now finding a good one second hand is getting to be quite difficult as these cars get older.