Theory Of Operation
WARNING: This page is about a different car, the 2015 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic checks for the proper response of the gear shift actuator 1st-3rd to the Transmission Controller Module (TCM) engage command. The gear shift actuator 1st-3rd is controlled by the TCM via the electrovalves PPV1 and PPV2. This diagnostic checks the position sensor 1st-3rd output to confirm that the gear shift actuator 1st-3rd has moved to the proper position when it is controlled by the TCM and that the gear has been engaged.