Series 60 Turbo Boost

[Vantare]

For you series 60 guys or anybody else we are traveling with friends that have 60's in their Prevost,here is the problem today his boost went away no codes showing.

We have cleaned all connections , pins, checked the turbo,air cooler for leaks and even changed the sensor the silly thing will loose power no black smoke no boost pressure but you can turn the cruise control and the boost goes up to 30 lbs fairly easy. Prevost Tech was no help it was a waste of an hour.

we are completely lost,

Vantare