A hose diagram of a 1990 Toyota can be found on the underside of the hood. It is also available at a website called AutoZone.
Should be a vacuum hose diagram attached to the underside of the hood or nearby.
Toyota ae 91 4AF Vacuum hose diagram
1993 on Toyota corolla vacuum hose
Yes, there is a diagram for the vacuum hose and sensor for this vehicle. It is found in the maintenance manual and in its repair manual.
At the Nico website
I suggest you go to your nearest Toyota dealer and ask for a copy of the hose routing for your vehicle. That is where I got my last one from.
Look on the underhood sticker.
Follow the link and buy the bookhttp://www.themotorbookstore.com/toyota-pickup.html
The best place to find a diagram of hoses for a 1992 Toyota pickup power steering is in the owner's manual. Most auto part stores will also have a diagram of the hose.
follow the lower radiator hose to the engine. the hose attaches to the thermostat housing.
In a repair manual from DISCOUNTAUTOREPAIRMANUALS.COM
1990 Camry 4 cylinder thermostat is located off the bottom intake hose connected to the engine block.