Wiring differences truck to F body PCM?

[EagleMark]

Trying to figure out if I did something wrong in tune or have a bad PCM or wiring differences in truck to F body harness?

Motor is a 2002 5.3L DWC with TH400 trans, I used a 2002 Chevrolet Silverado Truck Automatic LM7 5.3 Litre (12212156) with Camaro manual trans segmant swap and diagnostics. But it won't run right and sets no codes. Then I find out his origanal harness and PCM is a F body LS1 6.0L and runs? Supposedly a stock PCM tune but throws a lot of auto trans DTCs...

[minytrker]

You can full flash that PCM to truck or f body tune. The pcm's aren't different but a truck harness and a f body harness have some different pinouts. What is your harness out of?

[EagleMark]

I assumed the engine harness and PCM were all from one vehicle before I mailed him a PCM...

Harness is out of F body.

What would be the best way to build a .tun for 5.3L truck engine, TH400 trans to F body harness? Or is it simple enough pin out changes.

Motor is already in truck and running, so harness has been worked on for fitment and injector issues. Just won't run right with the PCM I sent, starts and idles but acts like fuel cut off when reved? So is it there differences in .tun file?

[minytrker]

Start off with a 5.3 truck tune with OS 12212156 and do segment swap from a 2002 6 speed f body OS 12212156. Thats probably the easiest way or just start from a 2002 6 speed f body tune OS 12212156. Either way would work, I would do the first way myself.

[EagleMark]

I did do it the first way. So I must have something wrong or a bad PCM...

[mr.prick]

I have a list of pinouts using what I found for the 2002 5.7 Fbody,Ybody & 2000 6.0 Silverado.
Would that help?

[EagleMark]

Maybe? Thank you. Since I seem to get all pieced together transplants it can't hurt now or future... way easier to do this hands on!

[mr.prick]

:angel_innocent:
14320

If anyone has anything to add or edit in this list, please reply.

I could not find anything with all the pin assignments for the LS1 pcm.
This is based off an Fbody list that's been around for a while.

[EagleMark]

Well that is enough changes to understand why it won't work! Thanks!

So solution to a .tun file is build a 5.3L out of a 6.0L manual F body file?

[mr.prick]

You are running an auto trans with a manual tune?

[EagleMark]

It's a 5.3L and TH400 trans so yes. Would there be a better route?

[ScarabEpic22]

Pick either a truck PCM wiring or F-Body then build your tune from there. If you go truck 5.3 wiring, then use a truck OS and seg swap a F-body manual trans seg. If you go F-body 5.7 manual wiring, then use a manual Camaro OS and adjust the tune for the 5.3. Either way will work, there are some reasons for going with a truck OS vs car OS and vice-versa but Im well versed in the differences.

[EagleMark]

Pick either a truck PCM wiring or F-Body then build your tune from there. If you go truck 5.3 wiring, then use a truck OS and seg swap a F-body manual trans seg. If you go F-body 5.7 manual wiring, then use a manual Camaro OS and adjust the tune for the 5.3. Either way will work, there are some reasons for going with a truck OS vs car OS and vice-versa but Im well versed in the differences.Well we have a F body harness connected to 5.3L truck engine, done by someone, and it runs decent with a F body 6.0L auto PCM. So obvious choice would be F body manual, right? Then 5.3L adjustments to it.

I'm all ears...

[ScarabEpic22]

So the PCM side is for a manual F-body? Then yes, use a F-body tune (no such thing as a stock 6.0L F-body tune fwiw) and change all the settings on the engine side to a stock 5.3 to start with. :D

[EagleMark]

5.7L I knew that, my bad, he told me it was a 6.0L PCM in a 5.3L truck engine....turns out to be a 5.7L F body harness and PCM, this is where the mis-information and wrong tune began. Now with your guys help I also know of the wiring differences...

:good:

[y5mgisi]

What did you end up doing to rectify this situation? I have the EXACT situation going on with my swap! LS1 PCM and harness, stock 5.3, and th400. I have had a guy try to reprogram the PCM twice but he is having trouble with it. I had the same issue you had also, in that the o2 sensors werent being read with the 5.3 program, but they would read fine with the ls1 program.

[y5mgisi]

LOL!!! Wow! If i would have just read your user name! Its you! I bet this was about my truck wasnt it? LOL oh boy... Well let me know if/when you want to give it another shot. Glad i didnt bad mouth you! Lol

[minytrker]

If you still dont have it fixed pm me.

[EagleMark]

LOL!!! Wow! If i would have just read your user name! Its you! I bet this was about my truck wasnt it? LOL oh boy... Well let me know if/when you want to give it another shot. Glad i didnt bad mouth you! LolWell that was 5 months ago and after I sent the wiring changes needed and didn't here back I thought it was fixed...

Maybe minytrker has a better answer?

[y5mgisi]

Nope. After that it went back to get stuck in paint jail again... Anyway, i'll send him a PM and see what he has to say. I remember that it was a hassle for one reason or another and that it wasnt easy to stick the 5.3 parameters into the pcm and have it still read the 02s. Hope you dont think i was dogging on you! I still REALLY appreciate you helping me out the way you did!

[y5mgisi]

miny, I cant for the life of me figure out how to send a PM on this forum! Can you perhaps send me one? I would like to hear what you have to say regarding this issue.

[EagleMark]

Wasn't a hassle, just a learning experience. I like helping the guys at CK5.

The issue was case ground to isolated ground O2 sensors. I've never heard of or dealt with them before. Thought you rewired and were done? I'd still like to know if that is the cure to a truck tun in a F body harness.

[y5mgisi]

I have been trying to avoid that still. Could end up being my only option, but I would really like to not have to rip open my harness.

[joecar]

miny, I cant for the life of me figure out how to send a PM on this forum!
...

You need 10 posts to your name first.

[y5mgisi]

Well then i'll start subscribing to some threads! Incredibly informative stuff on here!

[y5mgisi]

Oye. Most the stuff i would sound like a tard to respond to. I'll just pad a little if thats quite alright? Only need 3 more after this.

[y5mgisi]

And only two more after this.

[y5mgisi]

One more.

[y5mgisi]

And number 10! PM coming to miny

[y5mgisi]

Still cant do it!

[joecar]

I notified the forum admin.

[y5mgisi]

Thanks! I got an E-mail from Andrew who is assisting me with the problem.

[y5mgisi]

Just to add a little information as to whats going on, here are some screen shots from my "scan tool". So the o2's are "reading" full rich and the fuel trims arent adjusting because the o2's arent ever being seen by the computer because it never goes into closed loop. Near as i can tell. Previously, running the ls1 tune, it would go into closed loop almost immediately and start adjusting the fuel trims down. With the ls1 tune, the o2's would bounce up and down just like a heart monitor as they should.

15290

15291

15292

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[y5mgisi]

Got a PM into miny now with Andrew's help!

[y5mgisi]

Just for fun, here is a link to my swap thread.

http://coloradok5.com/forums/showthread.php?t=294573

[joecar]

Just for fun, here is a link to my swap thread.

http://coloradok5.com/forums/showthread.php?t=294573

Does this work ok (it sees the low pressure side of the pump when the TS opens):


http://i597.photobucket.com/albums/tt55/y5mgisi/IMAG0614.jpg

[y5mgisi]

Actually thats one of the things i intend to change. I have a problem with the truck getting hot on the highway. Im going to plug that hole and run the steam lin to the water pump like everyone else does and see if that helps.

[EagleMark]

PM me your number. I'll be in Portland the 13th through..... we'll flash the F body tune back in. Unless someone tells you how to fix a truck tune.

[y5mgisi]

Nice man! PM coming! Thanks AGAIN!