Suggest you have good read through the OBDII thread in the Corolla/Sportivo section. There is a lot of good stuff in there on this subject, especially from the " Sucess I've got it working" section. I used the information to get mine working and I can tell you it's not easy, but it is doable. It works on both my 2001 Camry and 2005 Corolla. Toyota are very protective of their software. It may take a while for you to work it out, but it does work if you follow the steps. The best place to start is from "SUCESS I HAVE IT WORKING!!". That's where most of the info you want is.You will need the Techstream software. It's awhile since I did mine so my memory of what I did do is somewhat faded..But it does work....
I hope I have been of some help and the best of luck to you..By the way one of the things that does happen when you plug it in is, the ABS light does blink!! The ELM327 is not the unit you need. You will need a TIS Compatible one, it's all in that thread...