Ok I'm off work and don't have to rush. My original post. I was trying to say, I made that post before I purchased the truck and knew more about it. I was mistaken in thinking it was a 2000 until I saw the title of the vehicle. I then asked for the 2001 schematic and it was supplied in that thread. I know I have the 0411, it has 2 connectors not 4 like the 2000 pcm. The 2000 schematics are irrelevant.

So why does my 2001 Blazer with an 0411 pcm/harness not have an EGR pin in slot 55? Any ideas?

 

it should unless it is 2003/2004 (which didn't have EGR). Sorry, doesn't look like I'm going to be able to help. Good luck.

 

Ok, then the only explanation is the people I bought it from replaced the PCM connector with one from a 2003/2004. Assuming the other connections are mostly the same. The truck came with another wire harness and some other wire harness stuff

 

That might be possible.