what should the voltage be at the EGR VSV connection on 1997 Toyota RAV4

PO 401 NEW VSV shows no vacuum. EGR line off Q port attached to
vacuum pump ing. on o vac. with ign. off will some time hold 15 in. when ing is turned on it looses vacuum. Replaced VSV & modulator. no changes. I have been able to find the suggested voltage @ the VSV plug. po401 (2 codes)

Asked by for the 1997 Toyota RAV4
1 answer
I would go to this link and follow this article. I wrote this as I do Emissions Diagnosis and Repair at a Gold Shield Station in Calif. A P0401 is somewhat common on Toyota and they can be stubborn to resolve. The passages have to be 'perfecto' clean.