DP Tuner does not activate EBPV on 7.3l
 

Since the time I replaced my turbo, the DP tuner does not activate the EBPV.
I pull a 5th wheel RV and I use the EBPV closed ( when going down hill) as instructed by the tuner. The valve stays in the open position and will not close.
All other programs on the tuner work fine.
Everything is seems to be connected properly.
Anybody have any suggestions?
Thanks
Dfar