Before testing the timer motor, unplug the dishwasher
or shut off the power at the fuse
box or breaker
panel to avoid an electrical shock hazard.
The timer motor regulates the length
of time power is routed to each component. If the timer motor
does not function properly, it can result in a wide range of problems.
Common symptoms include sticking in a cycle, cycle times running
too long, or failure of the dishwasher to start at all.
To service the timer motor, it is necessary to
access the control panel in the door. Access varies by model;
on some models you can remove just the control panel on others
you must remove the interior or exterior panel of the door.
Before testing the timer motor, unplug the dishwasher
or shut off the power at the 
