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Accelerator Pedal Position (APP) SensorIt does say that a fault with 2 sensor signals will only allow the engine to idle, but it also says a detected malfunction will light the wrench, throwing it into limp mode. And my understanding is that once this happens, just as you mentioned, the key has to by cycled for it to clear if the conditions have cleared also.
The APP sensor is a 3-track potentiometer that is used to calculate driver demand for fuel quantity. The sensor receives a VREF voltage from the PCM and provides a variable voltage signal directly proportional to the accelerator pedal position.
A detected malfunction of the APP sensor illuminates the electronic throttle control (wrench) indicator. A PCM detected fault on one of the 3 sensor signals permits normal engine operation. A fault with 2 sensor signals only allows the engine to operate at idle.