[mozso]

Up to 2008 most European Toyotas don't use Can-Bus, we are ISO OBD-II (EOBD).

As for your 7th gen Celica you might want to try OBD 1 scanner. This is the protocol most aging Hondas use from that time as well.

Edit: although in many parts of the world OBD-II was mandatory after 2000-2001 I found info that many JDM Toyotas do not use OBD-II up until 2003. Try with some older OBD-1 scanner I think it will work.

You can use alternative method to flash the CEL using the check engine light and then manually decode it.

Try this ukraine website and translate with google:
http://translate.google.com/translate?hl=sl&sl=ru&tl=en&u=http://www.alflash.com.ua/dtctoyota.htm