I have tried on a few occasions to read Toyota and Mazda vehicles using the specific adapters supplied with the system and failed to read the vehicles on all the occasions. Using the Nissan and BMW adapters have been successful, no problems with standard 16 pin OBD as expected, and had no chance to use the others. but cant rely on the pair mentioned above. Any ideas?

Is there a definitive list of non supported vehicles then? I cannot go to a customer telling them I can read the car then having to let them down after trying all corners of the Maxidas...