So continuing my SAI slog, I opted to remove the alternator yesterday to gain access,
and created some high tech test equipment after work today.
The video result shows...
https://www.youtube.com/watch?v=G4_9qSA-m7A
The changeover valve is operating the cut off valve and air is being pumped into the exhaust manifolds.
Looks like buzzing out the wire harness is next.