There's no such bike. Do you mean an M1, T1, or maybe D11?
AFAIK, like most (all?) makers Fiido don't publish wiring diagrams, but most of it is pretty straightforward. If you need a spare/new/replacement throttle, the best place to buy one is Fiido themselves; not expensive and the wiring/plugs all match so it's simple plug-and-play, whereas the wiring/plugs of those you buy off ebay etc don't always match (others have tried).