This step will require a multimeter. If you aren't familiar with how to use one, here is a guide that will help you.

Disconnect the top bare copper wire aligned with terminal #5.

Be sure to grip the connector and not the wire when disconnecting.

Measure the resistance from the diagonal terminal (between terminals #4–#6) and the top copper wire aligned with terminal #5.

This reading should be 3.3–3.6 Ω. If it is outside this range the motor is defective and should be replaced.