Vacuum Control Valve (VCV)
Apply more than 3.5 in. (90 mm) Hg vacuum to port "S". Plug ports "R" and "Y", then blow air into port "T". Air should flow out "U", "W" and "Z". With no vacuum at "S", no air should flow.
Apply more than 3.5 in. (90 mm) Hg vacuum to port "S". Plug ports "R" and "Y", then blow air into port "T". Air should flow out "U", "W" and "Z". With no vacuum at "S", no air should flow.