A bit more info about the car would be helpful for helping you. That it is a petrol changes the possibilities, potentially.
Is this a 100-series?
Afaik, there was never a GXR sold in Europe, where are you, and which market was the cruiser intended for?
E.g. the petrol versions in the US have OBD2. In Europe it is mainly M-OBD. Oz is a different case again.
There is the Toyota Intelligent Tester, which would work an all, afaik.
Please make a signatur line in your profile, with the main vehicle details.