Good luck finding out the protocol, I went to my local Toyota dealer (I am in Tassie) and asked whether the Daihatsu Sirion GTVi 2000 model was OBD ll compliant and the answer was "we don't know we just plug in the diagnostic tool and it works" real confidence inspiring.
I want SG2 but I would like to know that it at least may work.
Oh, and I emailed Toyota Australia the same question and have received no reply.
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