Join Date: Aug 2017
Location: North Georgia, USA
Racer-X is offline
Re: Late production 95 , S-10 , 2.2 , 5 speed
While the "official" answer given above makes it sound simple, there's more to it than that.
The easiest thing to do is hook up an OBD-II code reader and try it. If it works, you get codes. If it doesn't work, it's probably ALDL on the 16 pin connector (looks like the OBD-II DLC). It won't damage the scan tool or the PCM if you hook up an OBD-II scan tool to the older ALDL connector that looks identical, it just doesn't work.
For the 4.3L VIN "W" engine, I've seen at least 5 different part numbers on the PCM, with PCMs installed in two different locations. I'd bet there are as many permutations on the tutu as well. Some are fully OBD-II. Some aren't fully OBD-II, but use the 16pin DLC and "talk" SAE J1850 protocol, so they communicate to some extent with OBD-II scan tools. Some are ALDL and use a different pin on the DLC with a different protocol (the older, slower ALDL serial protocol).
If you want to know for sure, you can look at the sticker on the upper radiator shroud. OBD-II vehicles specifically say "OBD-II Certified" in those exact words.
It's to the point now where I rarely answer questions about 1995 models because 1995's are like a box of chocolates.
If you can't light up the tires in the first three gears, you need more power.
If you can light up the tires in the first three gears, you need better tires.