If you have told me that the ruling that reflected the engine diagnosis unit related the accelerator and that changing it did not get anything, because you just had the doubt.
You would have the fault very possible in the connector of the accelerator pedal position sensor, since depending on the engine you carry, you accelerately accelerate in the engine through a steel cable (as formerly) or, what your car makes is to convert the position of the accelerator pedal into an electrical signal that the switchboard interprets and prepares.
If the collector breaks, do not accelerate and the light turns on, if the cables are broken, they are short -circuit or the connector is damaged, the result is the same, but changing the piece you do not advance anything, because the problem does not have the piece but the cables.
Greetings and denounces your case in all the forums you find and in some consumer association. Press and notice, know that you have the pan for the handle.