Diplomat adp8332 not washing properly?

My dishwasher is not washing properly at the end of the cycle it looks like the dishes have been 'steamed' rather than washed. from searches on the internet it points to the recirculation pump being at fault and this was apparently a weak point with the Askoll pump. I've stripped the pump off and before I buy another wanted to know how I can test it to make sure, it doesn't appear the same as some on various tutorials, the hose to the body ia removable ie isn't bonded at one side and the impellor although it comes off the shaft it has a plastic and rubber drive under it the pump fitted is an Askoll M95.1 part number 461972474392, any help would be appreciated.

Colin Robinson
January 2016