Use the traction pod to go fully forward and hold. Push the enter button.
Keep the traction pod in the middle and release your hand.
Push the enter button.
Use the traction pod to go fully reverse and hold.
Push the enter button.

After pressing the enter button the screen with either show pass or fail. It should pass, if it fails try the calibration over again. The value shown on the screen is the voltage of the pot. This will also give you a good view if something is wrong with the pot.