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The water inlet valve cam be tested on the J3 5 Blue to the J3-1 white for the cold water .
The hot water is tested on the J3-4 Red to the J3-1 white looking for 120 volts A/C
And it is actually the shift actuator and yes that is one of the components that the control board also checks before starting the washer .
You can ohm it out on the control board it is on the J16-1 Blue and J16-2 Pink and should read 2K to 3.5K ohms
And you can test the shifter for D/C voltage J2-4 Black + to the J2-3 Gray - for 13 volts D/C