Handed my RS200 turbo into my sparks today who plugged in his computer into my ecu plugs both under the dash and bonnet and it could not find either one, got something on some of the controls in the car from under the dash but not the engine. Wot now lol??

altezza is not obdII,
you will need to do a little more research through the forum to find out which code reader you will need.
maybe have to go to a toyota dealer, not sure, don't remember.
topic has already been covered in this forum.
also try tezzaworld, they would know better, for sure.
good luck.

Can't remember if I've put this link up before? [url="http://bitcrusher.org/3S-GE_Codes_List.pdf"]http://bitcrusher.or..._Codes_List.pdf[/url]
Lots of info on the [url="http://z4.invisionfree.com/lexusaltezzaclub/index.php?"]ACNZA Forums[/url] as well