Looking for detailed engine bay / ECU wiring diagrams

nmaier2201 · #1 (**permalink**) 01-07-09, 12:30 PM

I'm not going to go into the cause or the #$(*#(*$ reasons why, but I have an outstanding task to fix damage to my LS2 ECU main wiring harness. So I'm looking for a detailed mapping of wiring color codes for the ECU or the entire engine bay.
I have looked online, at the FAQ, and even did a cursory search here....fruitless for that level of detail

If someone has this information in a LS2 wiring diagram I would be more than grateful. I need to repair the wiring between the ECU and the fuse block, knowing which wires are what and where they go would be just a LITTLE helpful with the troubleshooting that is bound to follow

PM me if you got any info.

Thanks!

darkman · #2 (**permalink**) 01-07-09, 12:49 PM

Given the ambitous nature of your project I suggest you get the service manual. I bought mine, which is the official GM licensed version, through Helminc.com. Cost is about $135.

trukk · #3 (**permalink**) 01-07-09, 12:58 PM

Quote:

Originally Posted by darkman

Given the ambitous nature of your project I suggest you get the service manual. I bought mine, which is the official GM licensed version, through Helminc.com. Cost is about $135.

Ditto that.

I have the manuals as well. About 13" thick spread across 3 volumes. It has a LOT of wiring diagrams.

-Chris

perfect · #4 (**permalink**) 01-07-09, 01:00 PM

if you want to save some money, there is also a guy on the classifieds selling the GM service manual on disk. I believe it has the same information as the printed service manuals.

when I get home I'll see what I can find for you on the copy that I have.

nmaier2201 · #5 (**permalink**) 01-07-09, 01:22 PM

Aww that dude in the classified selling the digital copies is gone...

Anyone have a digital copy they want to part with?

Service manual eh? ......now why didn't I think of that. If it has detailed wiring docs... then it's worth it just for that. Thanks guys. Even if I have to buy a printed one.. it'll be worth it.

nmaier2201 · #6 (**permalink**) 01-07-09, 01:46 PM

Thanks Perfect. Let me know, unless I want to pay 50 bucks for the Helminic overnight shipping I will not get it in the next couple days. I'll pry buy it anyways, but just won't have it in time for the repairs.

ctsv154 · #7 (**permalink**) 01-07-09, 01:47 PM

Look on ebay too. There was a guy selling the cd on there.

rdjiv · #8 (**permalink**) 01-07-09, 02:07 PM

manual is well worth it...i'm sifting through mine right now attempting to figure out why my brakes are leaking.

nmaier2201 · #9 (**permalink**) 01-07-09, 02:15 PM

Quote:

Originally Posted by rdjiv

manual is well worth it...i'm sifting through mine right now attempting to figure out why my brakes are leaking.

.... if you happen to come across a ECU wiring diagram in your searches... let me know

NormV · #10 (**permalink**) 01-07-09, 02:18 PM

Should be less than $400 shipped for a new harness. It's your time and money to weigh in.

Unless you strip the harness of the black coatings and disect and lead each wire to where it is supposed to go or you'll never match by color as they use the same color multiple times.

Good luck!

Norm

nmaier2201 · #11 (**permalink**) 01-07-09, 02:25 PM

i'd buy it for 400 bucks. The dealer quoted me 1000.00 for a new harness. GM doesn't mess around anymore... 1 harness for every sensor and plug on the whole motor.

I did see a guy on ebay selling custom ls2 harnesses (minus ECU) for ~600 something. no digital service manuals though...I have seen them in the past both here and on ebay..... figures when I actually need one they are all gone.

I was afraid that GM might switch colors (I have seen that on some previous chevy's I have had in the past) I guess I was hoping that the service manual showed the color out of the ECU and what it was for... regardless of the color it changed to on the way there.

perfect · #12 (**permalink**) 01-07-09, 02:45 PM

the guy selling the CD can be reached at jonlisa (at) aol (dot) com

hope that doesn't go against our forum policy

rdjiv · #13 (**permalink**) 01-07-09, 09:54 PM

i think what you are looking for is in chapter 11, starting around page 11-72 in volume 3. many pages of wiring systems and power management diagrams with the color coding. not much good that does you and unfortunately my scanner is inop.

lawrence1 · #14 (**permalink**) 03-01-09, 09:59 PM

might want to talk to luke at lindsey cadillac. $1000 is more than retail. my local dealer quoted me at $600+ for the harness.
i had to rebuild mine at the ECU connectors and it wasn't cheap. i had to buy new connector plugs and new wire terminals and that was ~$200 with the discount as cost on those little terminals is $1.79-$2.49 EACH and there's quite a few of them.

a new harness might be closer to $500 at cost but you'd probably have to lift the motor to be able to route it correctly to all the sensors that have to plug in. I don't know how mechanically inclined you are but either way it's not an easy job.

i decided to repair mine and paid a tech at the dealership to fix it as a side job. it took him ~5 hrs to do from what he said. good luck.

nmaier2201 · #15 (**permalink**) 03-02-09, 12:11 PM

I did end up buying the service manual and it was money well spent. I also ended up repairing my harness and not buying a new one. It was just too bitter of a pill to swallow. It took me almost 8hrs to repair it all but hopefully it should hold up well...

my only regret is my fogs don't work now.... I'm willing to bet I had something to do with it

Of course rewiring the main ECU if I had to pick something to not work correctly... I'd pick the fogs.... and I'm not taking it apart again just to trouble shoot that ... I'd rather run another jumper for the lights when I get around to it.

Bottom line it... either way it takes a SH*(% ton of hrs to fix.