Air intake control vac question

[BosoMKII]

This canaster gismo is attached to the butterfly inside the manifold and the FPR.
htp://www.cygnusx1.net/supra/library/TSRM/em/EM_50.html

I have been through pages and pages of the manual and I can't figure out if that canaster gets its vaccum pre or post throttle body. Does it matter?
Thanks

 

[jetjock]

The vac source is located in the intake plenum, after the TB. The valve is ecu controlled via a VSV in response to the TPS and engine rpm (NE) signals. I don't have a N/A but that's what my books show.

 

[BosoMKII]

Rock. Thanks.