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38-44 psi with pressure regulator vacuum hose disconnected and plugged
there should be one under the hood of the truck above the driver side head light
Try looking in Mitchel's OnDemand5 program under Engine Performance/Vacuum diagrams for this vehicle, Hope this'll help.
Try looking under the hood for the vacuum hose decal or try a junk yard the decal might be under another hood.
Differentials were locked by vacuum pressure on a actuator on the front axle, if there is a problem with this actuator or with your vacuum system the front axle will not engage. You may want to remove the acy=tuator and clean it out, ot locate the vacuum leak in your system.
1993 on Toyota corolla vacuum hose
Pick up a Haynes repair manual. I believe it has what you're looking for.
VACUUM DIAGRAMS ARE TYPICALLY FOUND IN THE ENGINE COMPARTMENT, USUALLY ON A LABEL AFFIXED TO THE UNDERSIDE OF THE HOOD OR ON THE RADIATOR SUPPORT. YOU MAY HAVE TO TAKE OFF A PLASTIC COVER TO ACCESS THA LABEL IF APPLICABLE.
vacuum leak
Try autozone.com They have a good "Emissions" section, that breaks down into componets. They don't have everything ever invented, but they have the biggest slection of vacuum diagrams, all on one site, that I have ever found.