Hi JackPinMV, I had EXACTLY your same problem.
The "motherboard" of the throttle is gone. You should contact TM customer service and buy a new one...they are going to send the new motherboard and you just put the new one into the older one position. You just open the throttle (it is very easy, I did it by myself and believe I am denied for these things) and switch the new motherboard with the old one.
As cost I remember around 80euros with shipment.