Accelerator Pedal (AP) Sensor - 7.3L - Diesel Only

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Accelerator Pedal (AP) Sensor is mounted on the accelerator pedal on vehicles equipped with 7.3L diesel engines.
The AP sensor detects the position of the accelerator pedal and sends this information as a voltage signal to the Powertrain Control Module (PCM).
If the AP sensor or related circuits fail to operate in a normal manner, the PCM will recognize that the AP sensor signal is out of specification.
The PCM will then operate the transmission at a higher line pressure to prevent transmission damage. This high line pressure causes harsh upshift and engagements.