2007 LQ4.

If you look at sites with information like
E38 ECM Connector Pinouts

How do you know if it will work with YOUR exact model engine.
example
Link says "Below are the ECM Connectors for 2008 vortec 5.3L harness. Should be similar for 4.8L 6.2L applications. "

But have a 2007 LQ4 from a hummer.
What if wire#24 isnt a fuel pressure in that model - its actually something else ......... *shrug*

How are you guys approaching this if its not a direct pinout for your year/model.

Trying not to spend 20 hours to find it doesnt work.

 

Anyone ?

 

An E38 Is likely not correct for anything with an LQ4.

You have to use the correct pin out for whatever PCM your using.

 

Thanks 1fastbrick !!

So how do you find the PCM version for your truck
And where would you find the corresponding correct pinout .... ?

Was pulled out of a hummer - dont have the VIN.

 

Do you have the harness from the engine, or are you building it from scratch?

It was likely a P59 PCM as the LQ4 has a 24X reluctor wheel.

The easiest is to look up a replacement PCM/ECU from the donor vehicle on a site like Ebay. Find someone that has a real Photo and not a stock image.

 

Yes - black crank sensor - 24x reluctor, green/blue long style connectors to PCM

I have the PCM and the harness.

Will the numbers on the PCM tags suggest what version of PCM - I didnt chekc them as they looked more like serial numbers.
Lets say it is a P59 PCM - then what pinout do you follow ?

example
this site doesnt mentioned version of PCM specifically [http://lt1swap.com/2004vortec_pcm.htm] just says should work for most 2003-2007 years.

thanks guys !!

 

You have to know what your looking for and be able to cross reference it. Your PCM will look like this. P59 PCM

 

Sure.
But lets say its IS in fact as pictured above and is confimed as a P59 PCM - then what ?

is there a documented pinout for each PCM ?

 

Actual PCM pics

 

Standard P59 PCM It was used in several things from 03-07 classic. Had the same service tag # on my 2005 Silverado.

The way there wired is fairly similar, Only a few things changed over the years, like adding an electric fan circuit in 2005. Also a the Generator battery control module on the ground cable. I believe that can be tuned out.