Originally Posted by N54_Fan
Could you have left the temp sensor on the water pump off? If so there woould be "no communication" There is a plug that is attached to the WP that needs to be plugged in well. Also the ground for the WP is just in front an dto the driver side of the pump. If it is loose or disconnected it too would result in "no communication".
Temp sensor? I believe there is only one four pin connector to the pump that is plugged in. The ground is the wire that is towards the front of vehicle near the pump? it seemed tight