Because there is no throttle cable on a drive by wire system the computer needs to see what position you are placing the accelerator and it determines that by looking at the signal from the Accelerator Pedal Position sensor. Similar to the Throttle Position having redundant sensors, the Accelerator Pedal Position has two outputs that can be monitored in scan data as Accelerator Pedal Position D and Accelerator Pedal Position E. The system is set up that way so that if there is a sensor problem it will be noticed because the two outputs will no longer correlate. A mismatch here would set a P2138 and put the system into a limp in mode, limiting how much throttle can be given. Depending on application the two signals may vary in voltage output but they will always move together in sync as you press the pedal.
Kenny@GGAuto.Repair.
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