How big is the engen on the 1997 Toyota previa sc

Question edited for clarity.
Question moved to model category.

Here are the Fuse Box Diagrams

Toyota Previa 1995 Pin Fuse Box/Block Circuit Breaker ...

CarFuseBox https://www.carfusebox.com > toyota-previa-1995-pin...

Apr 15, 2023 - Toyota Previa 1995 Pin Fuse Box/Block Circuit Breaker Diagram ; 1, Relay Heater ; 2, Relay Heater ; 3, (Headlamp) Relay Light ; 4, Relay Engine Oil.

Fuse Box Diagram Toyota

Fuse Box Diagrams https://fuse-box.info > Home > Toyota
Fuse box diagrams (location and assignment of electrical fuses and relays) Toyota Previa (1995, 1996, 1997). Toyota Prius (XW11; 2000-2003)...> ...

Toyota Estima Previa 2G fuse and relay

FuseAndRelay.com https://fuseandrelay.com > toyota > estima-previa

Designation of fuses and relays Toyota Estima Previa 2nd generation, locations of control units and their diagrams. Cigarette lighter fuse.

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Please check the attached links: http://www.autozone.com/repairguides/Toyota-Previa-1991-1997-Repair-Information/ELECTRONIC-ENGINE-CONTROLS/Throttle-Position-Sensor/_/P-0900c1528008a21b
http://zenseeker.net/Previa/PreviaMaintenance-Engine.htm

Watch the video. Third Brake Light Bulb Change Toyota Previa 1991 1997 1993 Toyota Previa...

That previa has a central engine, so all engine work requires you take out driver and or front passenger seat out.

The EGR placement is here >> http://www.autozone.com/autozone/repairguides/Toyota-Previa-1991-1997-Repair-Information/EMISSION-CONTROLS/Exhaust-Gas-Recirculation-System/_/P-0900c1528008a1d5

near the bottom of the page.
Good luck

Which pressure control valve? Oil? Fuel?

If you look down at the engine and notice the larger black hose coming from the top of the radiator to the engine block. Where this hose connects to the engine is called the thermostat housing. If you take the hose off, and unbolt this housing, the thermostat is underneath and easy to swap out.

on all 4 wheels

The original fluid was Dexron III.

Continue using Dexron.

Your vehicle does NOT require Toyota Type T-IV, or WS ATF.

Previa ECMs CANNOT be 'reflashed". Whoever told you that the SC is programmed to 'choke' is lying to you; there is no such thing. That is the same with the slip, the engine cannot cause the trans to slip. Get another opinion from a credible mechanic. The one you have has no clue.

When you say "warning light is on", I assume you are not talking about the oil pressure gauge...
If not, here is your solution:
What you have is a very common problem: The oil LEVEL sensor has failed. Previas have 2 sensors; pressure & level of the oil in the pan...What you need to do is replace it, Toyota part number : 89491-28030.
BUT...This part is $380.45. Not cheap; Sorry but true.