Vats Delete mainly. Vehicle Anti theft system. The PCM has to get a signal from the BCM (body module) that the truck is being started, and all is well. If not, it will start, and immedeatly die. I know for a fact that ALL 98 vortec PCM's had VATS endbled in them. 97-96-95 is unknown. Also if you want, emmissions delete. You don't need an Evap canister, or an EGR to worry about replacing.


Here are some good links for you.

Power Block pinout... might not be EXACT, but it will help.

Guy here out an 01 4.3 in his yota truck

I recomend you go beg your local GM parts man for the pinouts of the ECU, sensors, and power distribution block at the VERY LEAST. If you are sharp, you can figure it out with just that.

Worst case scenario, you coudl get in touch with speed scene wiring. Here is the harness you would want from them. It makes me shiver to think how much their harness would be.
Speed Scene Wiring

If you need help, let me know. I've done a few of these <img src="/forums/images/graemlins/wink.gif" alt="" />