Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove pump cable from the pump
Disconnect the pump cable at the inline connector

Measurement:

Test 1.
Measure the resistance between pin 1 on the pump connector
to pin 1 on the pump inline connector.
Test 2.
Measure the resistance between pin 2 on the pump connector
to pin 2 on the pump inline connector.
Test 3.
Measure the resistance between pin 3 on the pump connector
to pin 3 on the pump inline connector.
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness.