Join Date: Jan 2005
Location: The Netherlands
County: Zuid Holland
As you said, the ABS computer calculates speed based on info from the ABS sensors, and sends it to the dasboard speedometer, amongst other things. This speed is also used by a lot of other functions.
If the abs computer doesn't get speed, I would expect an abs error to be indicated.
With "multiecuscan" you can test the speed indicator guage, it could be that the actual guage is defective....