Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector X2 from the PCB
Remove the connector from the diverter valve motor

Measurement:

Measure the resistance of each of the wires in the diverter valve harness as listed in the table below.
Pin on connector (X2)Diverter Valve Connector
8 (Pink)Pink
17 (Brown) Brown
7 (Blue)Blue
18 (Black)Black

Expect continuity on each of the tests.
Also visually inspect the condition of the harness.
Note:
Each pin on the PCB connector is numbered.