I followed the water path from the valve under the sink to the valve in the dishwasher. Checked that the valve in the dishwasher was not opening and that it was not plugged. But the solenoid integrated with the valve was not activated. Checked the diagrams on AppliancePartsPros.com for this dishwasher model number and ordered the valve. This was the easy part.
While I was at it, I ordered the 2 hoses from and in the dishwasher for the return of the used water to the sink as they were many years old. Again, it was easy to identify them and ordered them.
I often try to fix things myself first. AppliancePartsPros.com is especially easy to find the required parts.