That uses two TPS sensors in the electronic throttle body as they work opposite of each other. One has the volts increase as the other has the volts decrease and they use two for back-up to be sure its right. I have been away from the dealer since 2011 but we did have some bad throtle bodies a few times and I believe they have to be replaced as a unit as I dont think you can get any seperate parts for the ETB. We had a tool that would record all the electronics that I would use on cust cars with intermitant problems as I could actually put it on the vehicle and give it to the cust. All they had to do was press the button on the switch I would put in the vehicle when it acted up and it would record the electronics and many times helped me fix these part time problems that never seemed to act up when it got to the shop. I would download the recordings and then diagnose them. Ron