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Thread: Engine/transmission programming dilemma for GM truck

  1. #1
    Senior Member PSWired's Avatar
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    Default Engine/transmission programming dilemma for GM truck

    Hi everyone, I am planning to purchase FlashScan soon to use on a project I am undertaking. I'm installing a 2002 LQ9 (6.0L 10.1:1 compression genIII truck engine, used in escalade and SS) along with a 4L80e transmission (used in 3/4 ton and heavier pickups) using a 2002 PCM and wiring harness from a 3/4 ton truck into my 95 chevy pickup. I need to come up with a PCM image that will support the 4L80e and have calibration that will run the higher compression LQ9. Would I be able to take the calibration on my PCM now, for a low compression 6L motor and 4L80e, and copy the engine tables from another vehicle equipped with an LQ9 motor easily with EFILive's offerings? If not, what is the best way to go about doing this?

    My next question regards electric fan control. I'd like to use the PCM to control my electric cooling fans. I see the camaro LS1 computers have a provision for two speed fan control. Is there a way to make this feature work with my 2002 truck PCM? Of course I would have to add pins to the PCM connector and what not. Thanks in advance.

    Patrick

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    Lifetime Member Steve Bryant's Avatar
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    Patrick,
    The short answer is yes, I believe that it would work with some trial and error on your part. I have been one of the Beta Testers and I have a 2000 Yukon XL (K2500) with the LQ4 and 4L80E. The Basic calibration that is in the PCM you have for an LQ4/4L80E can be modified for the LQ9 by advancing the high and low octane spark tables for 91 octane fuel (as a starting place, you could copy the values directly out of a 2002 Escalade). I'm pretty sure that the fan functionality exists in the PCM already, you just have to go into the fan table and enable it (it will be disabled for the truck application initially) and add the pins, wiring interface and fuse(s) plus the fans.

    All my best,
    Steve

  3. #3
    Lifetime Member SinisterSS's Avatar
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    Steve's EFILive file with the 4L80E and the file of my SS with the LQ9 are posted here. 8)
    2009 Z06 LS7 / 2008 Sierra Denali AWD L92 6L80E
    Flashing control modules since 2001. 8-)
    Who needs a MAP sensor on a supercharged LS6 anyway.


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    Senior Member PSWired's Avatar
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    Wow thanks for the quick reponses! Now does anyone know if the truck PCMs support the two speed fan control or just single speed?

  5. #5
    Senior Member PSWired's Avatar
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    Oh and one more thing... will I run into any licensing problems reading other files to compile into one? I.E. do I need to use one PCM license per file read?

  6. #6
    Lifetime Member SinisterSS's Avatar
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    Licenses are only used when you flash. You can read any supported vehicle you can get your hands on for "free".

    Here's a screenshot of Steve's 2000 stock tune with the fan settings.
    Last edited by SinisterSS; July 11th, 2006 at 12:27 PM.
    2009 Z06 LS7 / 2008 Sierra Denali AWD L92 6L80E
    Flashing control modules since 2001. 8-)
    Who needs a MAP sensor on a supercharged LS6 anyway.


  7. #7
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by SinisterSS
    Licenses are only used when you flash. You can read any supported vehicle you can get your hands on for "free".
    I have actually considered going into the local GM dealer and 'test driving' the latest car just to dump the cal out...c'mon, you know you want to as well!!.
    Might even reflash it for them so the next real customer gets a surprise when the thing steps sideways on a 1-2 shift :lol: :lol:

    Cheers,
    Ross

  8. #8
    EFILive Reseller wait4me's Avatar
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    lol i wish someone would have done that for me when i got a new car.. lol you would think that dealers would try to promote computer mods as a special to the customer.. i would deffinatly buy a faster stock vehicle than a slow one..
    "If you can leave a black mark on the pavement, from the exit of one corner to the braking point of the next one, you have enough horsepower."

  9. #9
    Lifetime Member Steve Bryant's Avatar
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    Patrick,
    I opened Rick's 2004 Silverado SS .tun/bin file and have looked at the fan functionality (actually this aspect hasn't changed much since my 2000). I've done a screen copy below so you can look at what you would need to do. You would enable the fan operation and set the parameter values, save the .tun file and "download"/flash the PCM. Then, with the wiring and electric fans in place, it should work like a champ.

    Then I also did a screen dump showing the high octane spark table (I turned the 3D map so you could see the contour of the table better - this is easy to do and only takes a couple of seconds). You can copy this whole table by clicking on the upper left hand cell (A1 position which is blank) in the 2D table and select copy, then go to the same table for your 2002 PCM and click on cell A1 and select paste and all the values go right into your 2002 High Octane Table. Then you'll want to further optimize this and some other tables, but that's a lot of the fun and learning experience!

    Steve

  10. #10
    Senior Member PSWired's Avatar
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    Dang, you guys are just full of information! This PWM fan control has my interest. If I come up with the proper solid state switching circuitry to modulate the fan power, will my 2002 truck PCM support this feature? What pin numbers on the PCM would I use for this feature or the series/parallel fan wiring setup?

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