You will need a scan tool capable of performing that function (Autell, Snap On, OTC, or factory, NOT a code reader). Depending on the brand of scan tool it will be under ; "additional procedures", "miscellaneous functions ", or "system tests". From there you want to finde "learn ETC" (electronic throttle control) or "learn APP" (accelerator pedal position). It will tell you what to click and when to hold and release the pedal. If there is a wiring problem then it will stop you with an error message.
I would like to help you but you don't need much more information.
I imagine you took the whole set apart to get into your car.
I do not understand, the engine started with a correct idle?
