Yaris Sedan Throttle Failure- Electronic

[ras3448]

Hello Yaris World. I'm now a dual Prius/Yaris owner and enjoying the experience, but my Yaris has hit a major setback, mostly mea culpa.

I had a real long post, but it logged me out when I clicked submit :(

Anyway, I believe that I reversed the poles when I was jumping my '07 Yaris Sedan. Now I am getting no throttle response from the accelerator pedal. Also, the Check Engine, ABS, and BRAKE lights remain on. All other functions work, including lights, radio, power windows, A/C. The engine starts up and idles fine, and the transmission will shift into gear and move the car, but only at idle speed.

I've read a number of other posts, and the only thing that stands out is a ScanGauge ReadOut: P0121, which indicates "throttle pedal sensor switch "A" circuit range/performance". But I'm not sure if that applies to my situation.

I could really use y'alls help, I'm having my poor Yaris towed to the dealership tomorrow to have them see what's wrong, but I'm wary of dealers. Any input is much appreciated. If you need any more details to help/diagnose/hypothesize about this, please tell me and I'll be refreshing this page obsessively.

Thanks!