Automatic transmissions require fluid pressure to function properly Most run the primary pump off the back of the torque converter which required the engine to be running. I have seen them destroyed by towing, mostly Nissans in my experience. I would not even consider coasting with the engine turned off in your Toyota, unlesss you had specific information from the manufacturer that clearly stated they would cover any warranty issues even with engine off coasting.
Why chance a rejected warranty claim that they can prove with the information stored in your ecu.
regards
Mech
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