Mech End stops on teenyslu not functioning properly

Hi

I'm having some trouble getting the end stops on my teensyly board functioning properly.

when I type M119 I only get the X and Z reading back correctly. Y won't return a high value at all.

x end stop only returns a value when it is plugged into the E port . z seems to work fine plugged in z port

I've checked through the sprinter firmware and it appears to be set up correctly. I'm using board 8 as specified in the geeetech teensylu wiki


I believe it may be the board, what are some steps to determine what's happening here?

thanks

David