Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Gain access to pump wiring connections
Disconnect wires from the pump

Measurement:

Test 1:
Measure the resistance across the disconnected pump live and neutral.
Resistance should be approximately 160 Ohms or greater.
(ErP pumps will be significantly higher)
Test 2:
Measure the resistance between the disconnected pump live and earth.
Expect greater than 1M Ohm.
Test 3:
Measure the resistance between the disconnected pump neutral and earth.
Expect greater than 1M Ohm.
Note:
Pump located external to appliance and connections may differ.