Hey everyone this is my first time posting on this site. I love all the stuff I have picked up so far but this i am kind of stuck on. Are the ECU's from a 90 to 95 4runner interchangeable? My buddy is having some serious problems with his rig. I have a spare romputer and i was wondering if they are the same. Mine spare is 4X4 manuel his rig is 4X4 Auto thanks in advance

 

You really need two things:
1) The factory service manual
2) Compare pins on the ECU.

I know that the 1993 had at least 3 different ECUs.
4wd manual
4wd auto
2wd

They're pinned differently and have different connectors, so you can mix 'em up.

However,earlier toyotas sometimes have the same connectors and different pins - IE the 86 turbo and 87-88.

Basically, I'd need to see a pin out of your connector and compare that to the pin out of the 1995.

Something like this diagram below:



It's likely that they would work, but check before making an electrical disaster...