Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Unplug the mains harness (left hand side) from the pump

Measurement:

Test 1:
Measure the resistance between the left and right pins of the pump.
Expected resistance greater than 1 MOhm (or O.L.)
Test 2.
Measure for resistance between the middle and right pins of the pump.
Expected resistance greater than 1 MOhm (or O.L.)