Hey guys...Just starting to gather some information before I start ripping my truck apart before long.

I recently acquired a 2004 8.1l/4l80e combo out of a 04 Yukon XL 2500. I'm trying to figure out how I can find the computer pinouts for the 2004 so I can see what all will be necessary to get all of my gauges/fuel pump, sending unit, etc to work 100% correctly. I definitely am not willing to "half way" do this, I want everything to work just as stock, but I think I need to get the 04 pinouts to see what is necessary. I have my 1997 Factory Service manuals I can compare with, but I'm seeing if I can avoid spending the 130-150 bucks for the 2004 service manuals.

Does anyone here have access to this information? It would be greatly appreciated. I will most definitely have a build thread on this swap, just trying to get as many ducks in a row from the getgo as i can

Thanks fellas!
Bryan

That's a tough one to find online... I never found them.....but those manuals are awesome for the info you are looking for unfortunately
Sounds like a neat swap! keep us posted
Robby

stroker97k1500 wrote:

That's a tough one to find online... I never found them.....but those manuals are awesome for the info you are looking for unfortunately
Sounds like a neat swap! keep us posted
Robby

Yeah, as far as I can tell, I can't find them online. Was really hoping someone with an Alldata account could look? Or perhaps one of our smart fellas here has an inside hookup that could help me out. I will buy the manuals if I have to, but if I can spare spending 150 bucks on manuals just for the wiring, I'd most certainly appreciate that I'll definitely keep this site posted...Perhaps, this info can eventually be added to Lextech's wiring database

I used to go to Superior Chevy or Morse Chevy and they would let me copy pages out of their service manuals. Now that everything is on line they may be able to print it up... I would usually go into the service departments to get that. Parts didnt have access to it. Alldata has it and you can get a 1yr Alldata subscription for less than $20. www.alldatadiy.com

TJ

2x

I have Alldata pro but the DIY is just as good the only difference is that the DIY only lets you pick one YEAR MAKE AND MODEL.

Edit: If you only want the pinouts I can pull them up and E-mail'em, so can Jeff (Lextech)

Get an Alldata subscription or see if your local library has a subscription to it. Also, you might find that it will be easier to locate a 2002 or earlier PCM for your swap, and modify the harness to fit it. In that case you will need the 04, 02, and 97 schematics.

L31Sleeper, thanks for that offer...I really appreciate that! I'm going to send you a PM and maybe you can email those to me. Greatly appreciated.

PSWired, That's a pretty good point. What do you think the benefit of a 2002 PCM would be over the 04 PCM I got with this engine? Not opposed to it, by any means...just wondering what the benefit would be. Would I be able to load the 04 8.1l/4l80e tune on the 02 PCM?

thanks a ton guys!

In 2003 GM began to use the CAN data bus to carry information between modules in the full size trucks, so for example the fuel level output from the PCM will be over the data bus instead of having an analog connection that will work with your old gauge cluster. A 99-02 PCM will make ABS, fuel level gauge, oil pressure gauge, etc. integration easier. Also most 02 and earlier engines had a cable actuated throttle blade- not sure on the 8.1 engines, check that out.

Thanks PS!

The 8.1 has a Drive by wire system...I got the pedal and harness/computer for that with the engine...I can always use a cable driven throttle body if I have to though.

Good information on the 2003 computers though...Didn't know that. I guess a 2002 computer will be necessary. I wonder if the 0411 PCM would work, since that is proven to work with the 97 trucks?

Yes, the 0411 is the PCM used in the 99-02 fullsize V8 trucks.

Just wanted to give a quick update.

L31Sleeper (Justin) sent me the 3 different pinouts for the 97, 02, and 04...The 02 and 04 are VERY similar...It looked like maybe 10 wires max, were different, and need moved around. However, there are a couple of wires that show up on the 04 list that don't show up on the 02 list...The have the circuit number listed, but I have no way of getting what circuit that is...Might have to have Justin look for me again if he doesn't mind. I'm going to make a list of the differences tomorrow at work (haha) and I'll post up again. If it is in fact this similar, i think the wiring part of this swap should be pretty simple (knock on wood)...

Thanks again Justin!

Also, just found out that the tranny i got with this engine is, in fact, a 4l85e Does the 4l85e have the same output shaft as the 4l80e? I only ask because I plan to mate this up to a 241c and I'm hoping the 32 spline input works

blackpearl wrote:

Also, just found out that the tranny i got with this engine is, in fact, a 4l85e Does the 4l85e have the same output shaft as the 4l80e? I only ask because I plan to mate this up to a 241c and I'm hoping the 32 spline input works

pretty sure the 80/85 outputs are the same, like the 60/65 are

blackpearl wrote:

Just wanted to give a quick update.

L31Sleeper (Justin) sent me the 3 different pinouts for the 97, 02, and 04...The 02 and 04 are VERY similar...It looked like maybe 10 wires max, were different, and need moved around. However, there are a couple of wires that show up on the 04 list that don't show up on the 02 list...The have the circuit number listed, but I have no way of getting what circuit that is...Might have to have Justin look for me again if he doesn't mind. I'm going to make a list of the differences tomorrow at work (haha) and I'll post up again. If it is in fact this similar, i think the wiring part of this swap should be pretty simple (knock on wood)...

Thanks again Justin!

Yes, the 02/04 should be very close. The PCM connectors are different but that is not hard to fix. What are the wires that you need identified? Tell me the name and I might be able to tell you where they go.

PSWired wrote:

blackpearl wrote:

Just wanted to give a quick update.

L31Sleeper (Justin) sent me the 3 different pinouts for the 97, 02, and 04...The 02 and 04 are VERY similar...It looked like maybe 10 wires max, were different, and need moved around. However, there are a couple of wires that show up on the 04 list that don't show up on the 02 list...The have the circuit number listed, but I have no way of getting what circuit that is...Might have to have Justin look for me again if he doesn't mind. I'm going to make a list of the differences tomorrow at work (haha) and I'll post up again. If it is in fact this similar, i think the wiring part of this swap should be pretty simple (knock on wood)...

Thanks again Justin!

Yes, the 02/04 should be very close. The PCM connectors are different but that is not hard to fix. What are the wires that you need identified? Tell me the name and I might be able to tell you where they go.

If you don't mind, I'll get back to you around lunch time. I still have to write out the differences between the two...I didn't realize the connectors were different though...Both the 04 and 02 list the connector part number as 12191489...

One of the PCM connectors is a different color. I would also bet that it's keyed differently. My guess would be that you could fix the keying situation with a dremel tool, or just get the right connector housing and swap the pins over since you'll be moving wires around anyway.

PSWired wrote:

blackpearl wrote:

Just wanted to give a quick update.

L31Sleeper (Justin) sent me the 3 different pinouts for the 97, 02, and 04...The 02 and 04 are VERY similar...It looked like maybe 10 wires max, were different, and need moved around. However, there are a couple of wires that show up on the 04 list that don't show up on the 02 list...The have the circuit number listed, but I have no way of getting what circuit that is...Might have to have Justin look for me again if he doesn't mind. I'm going to make a list of the differences tomorrow at work (haha) and I'll post up again. If it is in fact this similar, i think the wiring part of this swap should be pretty simple (knock on wood)...

Thanks again Justin!

Yes, the 02/04 should be very close. The PCM connectors are different but that is not hard to fix. What are the wires that you need identified? Tell me the name and I might be able to tell you where they go.

Ok, it wasn't quite as close as I thought initially, but it's still not too bad...Instead of posting what wires are what, I'm going to post a picture of the differences I found...These are on a "Line" level...if there was a difference on the line between the two pinouts, it was listed here...Everything else ended up exactly the same (same circuit number...and name in most cases)

2004 C1:7 - Not sure what circuit 2705 is, it wasn't on the 02 pinout
2002 C1:17,18 - I don't show these anywhere on the 04 list? Any ideas?
2004 C1:22 - PTO? I thought those were on tractors Again, not on the 02
25,26 - These seem to the be the same, but are on different circuits, I want to make sure the banks are correct on the 02.
2002 C1:32,34 again, these don't show up on the 04 list
2002 C1:38 - what on earth is this? Circuit 1101
2004 C1:39 - am I going to be able to start the truck without this connected? I imagine this is something to do with the factory security.
2002 C1:60 - Circuit 510, low reference, what is circuit 510?

2002 C2:6,8 - What is this? It's a solenoid of some type, but I'm not sure what it controls, doesn't show up on the 04
2002 C2:12-13 - Circuit 1163, not sure of this either
2002 C2:22,23 - ISS High Signal Low Signal - If i recall correctly this is for the front connector on the 4l80e, right? Since that isn't on the 04, should I just run wires from the tranny to here?
2002 C2:51 - Circuit 1227, TFT Sensor Signal?
2002 C2:52 - Generator Field Duty cycle signal? Hmm

Ok, those are most of my questions for now...Just starting to get confused on where some of this stuff from the 04 wiring harness will go, and what I might not need, due to the year of the truck it is going into.

Any and all advice is appreciated.

Thanks PSWired for offering to look!

blackpearl wrote:

PSWired wrote:

blackpearl wrote:

Just wanted to give a quick update.

L31Sleeper (Justin) sent me the 3 different pinouts for the 97, 02, and 04...The 02 and 04 are VERY similar...It looked like maybe 10 wires max, were different, and need moved around. However, there are a couple of wires that show up on the 04 list that don't show up on the 02 list...The have the circuit number listed, but I have no way of getting what circuit that is...Might have to have Justin look for me again if he doesn't mind. I'm going to make a list of the differences tomorrow at work (haha) and I'll post up again. If it is in fact this similar, i think the wiring part of this swap should be pretty simple (knock on wood)...

Thanks again Justin!

Yes, the 02/04 should be very close. The PCM connectors are different but that is not hard to fix. What are the wires that you need identified? Tell me the name and I might be able to tell you where they go.

Ok, it wasn't quite as close as I thought initially, but it's still not too bad...Instead of posting what wires are what, I'm going to post a picture of the differences I found...These are on a "Line" level...if there was a difference on the line between the two pinouts, it was listed here...Everything else ended up exactly the same (same circuit number...and name in most cases)

2004 C1:7 - Not sure what circuit 2705 is, it wasn't on the 02 pinout

Not sure here

2002 C1:17,18 - I don't show these anywhere on the 04 list? Any ideas?

Looks like your 04 diagram is for a manual transmission. Find the one for the 4L60e and you'll see where all these sensor lines go.

2004 C1:22 - PTO? I thought those were on tractors Again, not on the 02

Ignore all the PTO stuff, those cavities will be unpopulated.

25,26 - These seem to the be the same, but are on different circuits, I want to make sure the banks are correct on the 02.
2002 C1:32,34 again, these don't show up on the 04 list

More transmission stuff

2002 C1:38 - what on earth is this? Circuit 1101

For the stability control system- ignore!

2004 C1:39 - am I going to be able to start the truck without this connected? I imagine this is something to do with the factory security.

Somewhere on the 02 diagram, there should be a start request line and a starter relay control output. The sequence goes like this:

Ignition switch > neutral safety switch on transmission > PCM start request input > PCM starter relay control output > starter relay > starter solenoid

If there is no starter control in the 02 PCM for the 8.1, then you'll attach the neutral safety switch output directly to a starter relay or the starter solenoid, depending on your wiring harness.

2002 C1:60 - Circuit 510, low reference, what is circuit 510?

Don't know...

2002 C2:6,8 - What is this? It's a solenoid of some type, but I'm not sure what it controls, doesn't show up on the 04

Pressure control solenoid- more transmission stuff

2002 C2:12-13 - Circuit 1163, not sure of this either

This is the gas pedal (accelerator pedal position) sensor

2002 C2:22,23 - ISS High Signal Low Signal - If i recall correctly this is for the front connector on the 4l80e, right? Since that isn't on the 04, should I just run wires from the tranny to here?

Yes, this is transmission stuff. You need to get the diagrams for the right transmissions.

2002 C2:51 - Circuit 1227, TFT Sensor Signal?

Transmission fluid temperature.

2002 C2:52 - Generator Field Duty cycle signal? Hmm

Connects to brown wire coming out of alternator.

Ok, those are most of my questions for now...Just starting to get confused on where some of this stuff from the 04 wiring harness will go, and what I might not need, due to the year of the truck it is going into.

Any and all advice is appreciated.

Thanks PSWired for offering to look!

All of this will match up much better when you have the correct transmission versions!

Oh, and my comments are inline above. They don't stand out very well...

PSWired wrote:

All of this will match up much better when you have the correct transmission versions!

Oh, and my comments are inline above. They don't stand out very well...

I was wondering about that actually...(the transmission)

Thank you so much for the help...Looks like you cleared up most of my questions...guess I should try and verify if I have the right transmissions through Justin.

Justin? Can I get a little help?

Did you get what you need ??