The upper washer sprayer arm does not seem to be turning during wash cycle.
You may want to start the troubleshooting from verifying proper connection of the upper spray arm manifold to the water feed tube at the back wall of the dishwasher (#6 & #1 on the diagram.
If there is nothing wrong, then most likely the cause of the problem is the pump chopper (#6 on the [URL="http://www.appliancepartspros.com/pump-motor-parts-for-kitchenaid-kuds30ivbt4.html)). You can find more detailed instructions in one of our previous post - http://forum.appliancepartspros.com/dishwasher-repair/2903-whirlpool-dishwasher.html
Here are the breakdown diagrams for Kitchen Aid dishwasher [MODEL]KUDS30IVBT4[/MODEL]
Good luck.