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Thread: DBW pedal and TAC module differences

  1. #1
    Lifetime Member DURAtotheMAX's Avatar
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    Default DBW pedal and TAC module differences

    I posted this on LS1tech also, but ive never gotten any responses in any thread Ive posted over there...everyone here is much more helpful.

    Ok so Im piecing together my setup thats going in my offroad buggy.

    99 4.8 mated to a TH400 (used the spacer etc..)

    I converted it to drive by wire.

    Im not sure what year the [truck/SUV] harness is from. It has RVC (regulated voltage control, the "smart" alternator control module) so that means it has to be at least a 2005, and at the most a 2007 because its an LS1-style harness (GMT-800). I might take the part number to the GM dealer and see if they can look up what applications it was used in.

    I bought a TAC module and pedal assembly from a 2005.

    I know they switched to the new style pedal in 2006, and I would assume a new TAC module too?

    Heres where I get confused...im looking at the GM service manuals and it seems that from 2003-2004 the pedal had 3 sensors. Then in 2005 it went to 2 sensors (but still the old style pedal assembly with the external springs and pivoting pedal etc), and then in 2006 they went to the completely new pedal assembly (which also has 2 sensors).

    I know the TAC module will care what kinda pedal its talking to, but does the PCM care what TAC module its talking to, as long as the PCM is an 03-07 and the TAC module is an 03-07???

    Why im asking is because I want to run a manual trans OS in the PCM because im running a TH400. But the only manual 4.8 OS I can find (in EFILive format) is from a 2004...which supposedly has the 3 sensor accellerator pedal assy,

    If I use the 2004 PCM is it going to care that its talking to a newer 2005 TAC module [that only monitors 2 accellerator pedal sensors instead of 3]??????

    Im guessing it wont matter....because ive looked at the schematics from 2003-2007 TAC modules, and the PCM <---> TAC wiring is identical. Only difference is the TAC <---> pedal wiring itself on the 2003-2004, 2005, and 2006-2007 trucks.

    I suppose I could just go ahead and try it, but I just thought I would check to see if anyone knew the answer for sure...

    thanks
    Ben
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  2. #2
    Lifetime Member minytrker's Avatar
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    Default

    The newer ones dont use a tac module. I dont remember using on on the last two swaps I done with 07+ motors and harness's and dbw.
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
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  3. #3
    Lifetime Member DURAtotheMAX's Avatar
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    yeah I know the E38, E40, etc.. dont use TAC modules.

    Im talking about LS1 style ECM's, which were used up until early 2007 on the GMT-800 trucks.
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  4. #4
    Senior Member Chuck L.'s Avatar
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    Have you read this thread? Seems to have considerable info on DBW, match/mismatch..
    http://www.ls1tech.com/forums/conver...silverado.html
    Chuck L.
    CODY Motorsports
    Fuel Injector Service
    Madison, GA.
    706-342-3152
    770-265-5144 [C]

  5. #5
    Lifetime Member DURAtotheMAX's Avatar
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    I got it all working. 2004 OS and PCM, with a 2005 TAC module and 2005 2-pot pedal assembly. The PCM doesnt seem to care, no codes or anything, works perfectly. (even tho stock 2004 apps had a TAC/pedal assembly setup for 3-pots, and 05+ only had 2-pots in the pedal assembly)

    ben
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  6. #6
    Lifetime Member GAMEOVER's Avatar
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    Quote Originally Posted by Chuck L. View Post
    Have you read this thread? Seems to have considerable info on DBW, match/mismatch..
    http://www.ls1tech.com/forums/conver...silverado.html
    Thats got a lot of good info....
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

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