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I'm just reading and studying up before attempting to wire and install my Haltech ecu in parallel to the stock one.

I came across a Word file with pinout listings which was formatted such that it printed to about 17 pages. For quick reference I decided to consolidate it all and, heck why not color code it to keep it easy?

I have more to go and will add the excel file to this post when done, but here is the work so far in png image for a quick reference guide where each connector's pinouts can print as a single page.

>> And by all means please proof read my work and offer any corrections. <<

Images updated 2-23-23. International 5.56 day?

If you try to save them from the screen on your device they come out as lower quality .webp files. I'll attach these three in a zip file below in cleaner .png

 

Here is the final product (File attached at bottom) including the throttle pinouts and electrical schematics.

Easy printable format with quick visual reference. I believe this was done on Excel 2010 so almost anyone can use it. Or if you don't have Office you can open it with Libre or Apache which are both free platforms which emulate MS Office and work with their file types.


>> File removed<<

 

This is why I go over certain projects and actually read the instructions ahead of time to process them out and make sense. Sometimes you encounter errors like this where if you breezed past it you might not catch what was wrong until you went to start your car two months later and it had a misfire you couldn't easily diagnose. I do happen to be adding this to my Excel sheet so it is an easy A to B, left to right format for the wiring connections to be made.

The lines in the Diagram for Injectors 7 and 8 are crossed. The GM pins are correct. The Haltech wiring diagram seems to be big on sequential numbering so my initial guess is simply that the visual line part of the diagram is in error but I will have to verify.

 

Attached is some more work from tonight. Some of the examples I am working from such as the TAC diagrams don't appear to be complete. And so there are some Haltech references to wires at specifics terminals which I trust the position of, but the color code for the wires may be wrong. I won't know until I dig in.


This file should supercede the one uploaded above as I have added and merged several pin descriptions to be more descriptive/accurate and revamped the typed color code to be simpler to read.

 

I got to the TAC wiring today and realized that the information given to me was incomplete. The C2 TAC Module correctly reflect what is found in my 2003 C5. I entered the color coding based on the actual lines on my car and copy/pasted the wire function because it seemed to match both the other C2 data shown lower in the file as well as the pinout guide provided by Haltech for the C2 TAC module. I do not currently have information on which circuits associate with these wires.

If I find more information which either fills in gaps or proves it to be incorrect I will amend the file.

I was also surprised to find my own files (from earlier versions above) looking back at me when googling for more information on the correct C2 data as 'Jesse B Shredical' who I bump into frequently on FB and I believe he has some posts here on the forum as @shredjesse has incorporated them into his how-to website which I'll link here: http://www.shredjesse.com/1999-c5-co...-documentation

 

Hope you don't mind I captured and referenced those. Wanted to capture them to make sure folks could find them!

Let me know if it's a problem or you want attribution or anything. I get $0 for that website and infact it costs me money, haha. I just want to make sure info isn't lost to time on these!

 

Even if you made a million on that info, I am not that guy. Share and share alike with these. In fact, before you posted I went back and just added the images themselves as cleaner PNG format to be downloaded since the forum here if you try to save them degrades to webp. Feel free to spread the cleaner copies and the excel file too!

 

I added the apparently pretty simple pin guide for converting a 1999-2003 0411 PCM harness for use with a P59 to enable flex fuel use on a C5. It exists in its own sheet on the far right with general instructions.

At some point in the future when I have time I will dig up the pinouts for the 1997-1998 PCM which I believe was the P01(?) and figure out the more involved re-pinning.

 

I've been struggling with the parallel TPS setup. Finally. Thank you so much.

 

Does the red pin 24 for TPS sig also have to be done for a Holley Terminator X Max? Which TPS signal is needed? It looks like their are 2 on each TAC connector. I'm about to undertake piggybacking a Holley ECU very soon and this popped up during my research. I need the stock PCM to be happy and not throw any codes to pass emissions testing still unfortunately.

 

Moved to C5 Tech.

 

Where can i find the accompanying pages to this diagram?

 

What do you mean by accompanying pages?

 

bottom right corner of the schematic...it says "Sheet 1 of 3". There are 2 more that cover the TAC module and cover coils 7 & 8 along with other things that need to be done in the wiring.

 

 

On my 2004, PCM C2 plug pin 24....there is no wire there to even get a TPS signal from. I wonder if that is a misprint.

 

You have a 2004 and therefore a P59 in a one-year-only ECU setup. Everyone else has a PO1, though some call the 01-03 models "0411" by their part number to differentiate them because they had a faster chip. The P59 is double the speed of the 0411 and can reflashed to unlock some elemental flex fuel maps. Other guys aftermarket have hacked some of them up to add things like two-step and whatnot but the expense and headache of that is pointless vs a Rebel LS which throws the door wide open for options.

Odd and annoying that the forum does NOT update me of people posting to a thread I have commented on or started if it has gone cold for a while. I basically surf the page by the "My Recent Topics" link and only venture into General or elsewhere when I'm diverting myself from something else.

I could not attach an excel file to the DM we have running so I'll just post screen shots of the pinouts for you here.

You had asked the question of me by DM about completion of the parallel install. I got the ECU lines carved out so I can add the harness and set things up. I began rewiring my coils and the harnesses for the injectors / tb / sensors two years ago when I swapped from SC to TT with my build. Amidst several events which have kept me out of the garage the car has sat and I now have an R3 instead of the Elite 2500T. When I finally get back around to wiring I will have to go back again and see what I may need to adapt from the old notes to the (likely) different Haltech harness needs.

 

By ECU do you mean PCM. Just trying to follow the factory nomenclature here and terminology the OP is trying to use.

What do you mean by one-year-only? Are you saying position 24 on connector C2 is uniquely empty for a 2004 PCM?

....then there is this note on the Haltech directions:

 

Looking at the images it appears pin 24 does not exist for any oem pcm/ecu. Not sure what the question is then.

 

Yes, I am aware of the absence of pin 24 in C2.

The question is directed at your statement ... "You have a 2004 and therefore a P59 in a one-year-only ECU setup."

What was the intended message to the OP?