There is probably a way to turn the homing off so you would be able to test the motor but I'm not sure where in the software that setting might be.I gave it a try.
Unfortunately our controller wants to home the machine right after turning it on. So I turned it off and moved the gantry right to the trigger point indicating home in the hopes it would fool the controller...but it didn't work.
The controller rotates the Y2 motor one direction for about a 1/4 turn and then back...then it stops and gives an error on the Y-axis.
After this the controller basically freezes up. Only option is to turn it off.