Turn off your KitchenAid refrigerator by pressing the "Off" switch on the inside, and then unplug the power cable from the wall outlet.
Pull your refrigerator from the wall and then locate the water tube leading to the water valve. Move the shut-off valve for the water supply to the "Off" position.
Use a screwdriver to remove the screw holding in the back panel and then remove the back access panel.
Remove the water tube by gently pulling it from the water valve. Use a screwdriver to remove the flare nut holding the water valve's bracket to the refrigerator.
Pull the water valve from the refrigerator and then disconnect the wires from the terminal. Set a multitester device to RX1 ohms and connect it to the terminal.
View the ohm rating you receive for the water valve, and then look for a marking on water valve that shows what reading you should receive. Typically, you will want a reading between 200 and 500 ohms.