From the service manual.
ACCELERATOR PEDAL POSITION (APP) SENSOR
The accelerator pedal position (APP) sensor is a three-track potentiometer that is used to calculate driver demand for fuel quantity. The sensor receives VREF voltage from the PCM and provides a variable voltage signal directly proportional to the accelerator pedal position. A PCM detected fault of one of the three sensor track signals will permit normal operation. A fault with two sensor signals will only allow the engine to operate at idle.
If one or more of the three tracks was indicating an error, I'd be surprised to not see a specific code for it.