Dishwasher Wont Start

My dishwasher, which I bought used, will fill up with water, but will not start. The water will drain out as well. It sounds like an electrical problem, maybe a relay, but I have no paper work on the unit. Any ideas???

Here is a service manual
http://www.servicematters.com/maytag_library/docs/16021814.pdf

And the tech sheet
http://www.servicematters.com/maytag_library/docs/16023224.pdf

And the parts breakdown
Model Search

Try to run the diagnostics.
Check the wiring to the motor and its capacitor