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Thread: strange acting T42 4L60E combo with 4wd tun file

  1. #11
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    Default Tc

    Only the manual TC shows the ECM getting the 4 Lo signal direct. I tried to wire my ECM this way with no luck; my VSS reads the same with signal or not.

    You are correct Robbie, only the manual TC has that 4wdlow connection to the ECM. That is what I have to use, 'cause my old '97 TC and the TCCM has no other connections to the ECM.
    Just to be sure I'll email you some schematics to compare with the Mitchel manual. ( I also have the Mitchel, an Alldata subscription for the '07 Suburban, and the GM manuals from '07..)

    Harald
    If nobody has done it before, somebody has to do it....

    1997 Tahoe 2dr 4WD
    2002 Alfa Romeo Sportswagon 2.0 JTD
    1982 Deutz Intrac 2004A
    2003 friesian Horse " Henry"

  2. #12
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    Default TCM 4wdlow ECM

    So , I tried to hard wire the 4 Lo signal into the ECM as if it were the "Manual" Transfer case, no luck. Maybe my calibration won't recognize those terminals.

    I think this is something we should keep an eye on. If different ECM tun files have different settings for the ECM 4wdlow input then this is an explanation for our problems.
    I remember Patrick (PSwired) saying that his combo (LMG plus 6 speed tranny) is shifting fine in 4wdlow but he also uses the 4wdlow input on the ECM and I have his original tun file in my ECM.. ?? even more questions...

    Harald
    If nobody has done it before, somebody has to do it....

    1997 Tahoe 2dr 4WD
    2002 Alfa Romeo Sportswagon 2.0 JTD
    1982 Deutz Intrac 2004A
    2003 friesian Horse " Henry"

  3. #13
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    Default Vss

    I went down the software path at first. Maybe a patch in the ECM to fool it into thinking it had a Manual TC and recognize the 4 lo input. But then what about the TCM calibration? Would it need to be modified? I like my tune and don't want to load a new one.

    Since IM still fighting the AFM software issue already, I decided to go around the 4 lo problem.

    I need a 40 tooth reluctor VSS anyway, so why not put it on the transmission output shaft and drive the speedometer from the TC.

    I guess it's a hardware band aid for a software problem, hope it works.

    These programmers are busy guys and will eventually get to all these issues , then it will become a matter of downloading software

  4. #14
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    Default

    Hi guys, what was the original powertrain in these two trucks?

  5. #15
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    Default Info on all components 1997 Tahoe swap

    ok this is all to my best knowledge:

    Parts summary 1997 Tahoe

    Engine 5.3 LMG 1GKFC130X7R239150 2007 Yukon 5.3 2wd

    ECM 3GNEC12047G152683 2007 Avalanche 2wd
    12605897 YNAU service number 12597121 86ynauk16194d88a


    Tranny 4L60E 1GNFK16367R390210 2007 Suburban 5.3 4wd

    TCM 3GNEC12047G152683 2007 Suburban 2wd

    Engine fuse box 1GNFK13087J142792 2007 Tahoe 5.3 4wd

    BCM 1GKFK163X7R007000 2007 Yukon 4wd

    Instrument cluster 1GNFK163X7J164217 2007 Suburban 4wd

    Gas pedal 1GKFK13J67R003500 2007 Yukon 4wd

    Air flow meter 1GCEC19C27Z500313 2007 Silverado 4.8 2wd


    My Tahoe is/was 1997 2dr 4wd, engine 5.7 Vortec, tranny 4L60E, TC NP241 (which is the only 1997 part left in the drive train)

    Harald
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    If nobody has done it before, somebody has to do it....

    1997 Tahoe 2dr 4WD
    2002 Alfa Romeo Sportswagon 2.0 JTD
    1982 Deutz Intrac 2004A
    2003 friesian Horse " Henry"

  6. #16
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    Default

    Quote Originally Posted by harascho View Post
    ok this is all to my best knowledge:

    Parts summary 1997 Tahoe

    Engine 5.3 LMG 1GKFC130X7R239150 2007 Yukon 5.3 2wd

    ECM 3GNEC12047G152683 2007 Avalanche 2wd
    12605897 YNAU service number 12597121 86ynauk16194d88a


    Tranny 4L60E 1GNFK16367R390210 2007 Suburban 5.3 4wd

    TCM 3GNEC12047G152683 2007 Suburban 2wd

    Engine fuse box 1GNFK13087J142792 2007 Tahoe 5.3 4wd

    BCM 1GKFK163X7R007000 2007 Yukon 4wd

    Instrument cluster 1GNFK163X7J164217 2007 Suburban 4wd

    Gas pedal 1GKFK13J67R003500 2007 Yukon 4wd

    Air flow meter 1GCEC19C27Z500313 2007 Silverado 4.8 2wd


    My Tahoe is/was 1997 2dr 4wd, engine 5.7 Vortec, tranny 4L60E, TC NP241 (which is the only 1997 part left in the drive train)

    Harald
    Ok good. Do you have the correct VIN's these items are out of? Some of the VIN's have been zeroed which makes them difficult to check.

    And are you using the BCM?

    Cheers.

  7. #17
    Senior Member PSWired's Avatar
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    Default

    To provide some more information, here's my setup:

    2009 5.3 LMG engine from 4WD tahoe (unknown transfer case type, but can dig up the VIN if you guys want)
    2007 6L80e transmission, 4WD version
    NP241 transfer case
    1995 GMC Yukon 4WD

    The VSS signal comes from the 6L80e internal sensors. The transfer case output shaft mounted VSS is used only for the ABS system and my speedometer (temporarily until I get the CAN interface box built). The 4LO signal from the transfer case goes to the ECM pin per the GM diagrams.

    The transmission shifts normally in 4LO. However, the speed as seen by the ECM is incorrect when in 4LO mode. I am going to wait until I have the matching 2009 OS and cal in the TCM before I do any further troubleshooting. There are some little incompatibilities between the '07 and '09 operating systems. Waiting on 2009 T43 support from EFILive before doing anything else.
    1995 GMC Yukon 4WD 4DR
    5.3 "LMG" engine: E85 with AFM
    6L80e 6 speed automatic transmission

  8. #18
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    Default Good Morning

    @ Patrick: Wasn't that a 2007 5.3 LMG with an ECM and 2009 OS or am I confused 'cause it's too cold over here?
    And just to be very sure, I think I asked before, that 4wdlow signal to the ECM is a low active signal (low when in 4wdlow)

    @gm308: Those VIN infos is all I got. Yes I use the BCM. I wired all my exterior lights in the 2007 way with the BCM as the "master". I also got the auto headlight running thanks to an ambient light sensor. The last thing I wired is the RCDLR to get the tire pressure monitor system runnig. As soon as I have new valve stems I will mount the sensors.

    Harald
    If nobody has done it before, somebody has to do it....

    1997 Tahoe 2dr 4WD
    2002 Alfa Romeo Sportswagon 2.0 JTD
    1982 Deutz Intrac 2004A
    2003 friesian Horse " Henry"

  9. #19
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    Default

    Quote Originally Posted by harascho View Post
    @ Patrick: Wasn't that a 2007 5.3 LMG with an ECM and 2009 OS or am I confused 'cause it's too cold over here?
    And just to be very sure, I think I asked before, that 4wdlow signal to the ECM is a low active signal (low when in 4wdlow)

    @gm308: Those VIN infos is all I got. Yes I use the BCM. I wired all my exterior lights in the 2007 way with the BCM as the "master". I also got the auto headlight running thanks to an ambient light sensor. The last thing I wired is the RCDLR to get the tire pressure monitor system runnig. As soon as I have new valve stems I will mount the sensors.

    Harald
    That is a real mix of different parts.

    Are you 100% sure your ECM and TCM and BCM are a matched set for 4WD?


  10. #20
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    Default ECM, TCM and BCM

    No I'm not.

    TCM, ECM and engine came from 2wd applications only the BCM and tranny were 4wd.

    I thought that there is no hardware difference in the components (ECM, TCM..) between 2wd and 4wd this is just a matter of the OS and calibration?

    I have Patricks OS and calibration in my ECM (his ECM was 4wd..and had the same OS..) and now I am fighting with the TCM 4wd tunes...

    The more I dig into it the more confusion is in my head....

    Harald
    If nobody has done it before, somebody has to do it....

    1997 Tahoe 2dr 4WD
    2002 Alfa Romeo Sportswagon 2.0 JTD
    1982 Deutz Intrac 2004A
    2003 friesian Horse " Henry"

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