Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the plug from the diverter motor

Measurement:

Measure for continuity (zero resistance) on each wire of the diverter valve harness.
Check the resistance between:
Blue to Blue (4.4) on X7
Black to Black (4.3) on X7
Red to Red (4.2) on X7
Green to Green (4.1) on X7
Expect continuity (zero resistance) on each test.