I've followed the steps outlined by Compact SUV Lover and found the following:
1) The vacuum modulator filter is clean.
2) With the engine off, when blowing air into port Q of the vacuum modulator, air comes out R but not P.
3) With the engine running at 2,500 rpm, air passes from Q to R, but not P.
4) Per this procedure: http://www.autoshop101.com/forms/h61.pdf
(page 7) I ran the engine at 2,500 rpm and connected port R to manifold vacuum. The engine continued to run smooth.
5) With the engine idling, I applied manifold vacuum to the EGR valve -- I heard a click from the valve, and the engine died.
#5 indicates that the EGR valve is good.
#2 thru #4 indicate that the vacuum modulator is bad.
From the posts I read, I really expected to find the VSV bad.
I'm planning to replace the vacuum modulator, but hoping it is a returnable part -- just in case.
Question -- what is the quickest way to determine whether a repair (replacing the vacuum modulator in this case) solved the problem?
We need to have the RAV emissions tested by November 27.