The wash pump or circulation pump in your Ikea dishwasher is the main motor if you like, the pump that drives the water around the dishwasher to the spray arms generating the spray and wash action. These are range or model specific parts.
Before replacing the wash motor do check the capacitor that is often used as, if this is fault, your will get the motor not starting or running poorly causing a poor spray action.
For technical help and advice please use the dishwasher forum where you can get expert help from dishwasher repairer technicians.
There is also a lot more help and advice about dishwasher faults in the dishwasher self help area of the website.