Here is a link, do not know if your dishwasher is covered here but it will give you an overview of how Maytags are put together and some general service help Free Appliance Repair Forum - Downloads
Since the unit runs in Drain mode I would suspect either the timer, the wash start winding or something jamming the motor from going in the wash direction.
The way the motor works is:
The relay to the wash or drain winding is closed.
The timer determines which winding is in circuit.
The relay coil and the main winding are wired in series
As the motor reaches its operating speed it requires less current.
This lower current is not enough to continue to hold the relay closed, it opens and you continue to run with only the main winding. |