Power Take Off
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The PTO system provides an input signal to the PCM indicating there is an additional load being applied to the engine. The PCM disables the on board diagnostic (OBD) monitors and increases the engine RPM based on the PTO system or auxiliary idle control input.