Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect connector from pump

Measurement:

Test 1:
Measure the resistance across the pump live (right) and the neutral (left) pin.
Expect greater than 1M Ohm.
Test 2:
Measure the resistance between the pump live (right) pin and the pump earth (middle) pin.
Expect greater than 1M Ohm.
Test 3:
Measure the resistance between the pump neutral (left) and the pump earth (middle) pin.
Expect greater than 1M Ohm.