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Thread: Need to verify if tune file I downloaded is 4L80E

  1. #11
    Joe (Moderator) joecar's Avatar
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    Here is 4th gear ratio reference: 11506-4l80e-question




  2. #12
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by joecar View Post
    Here is 4th gear ratio reference: 11506-4l80e-question

    i.e. to see if 4th gear is commanding you should see engine rpm drop even tho the pid GM.TIS stays the same as for 3rd gear...

    take a log of these pids:
    - GM.TIS
    - GM.TOS
    - SAE.RPM
    - SAE.VSS
    - SAE.TP
    - SAE. MAP
    - GM.GEAR
    - GM.BOXRATIO
    - GM.TCCMODE

  3. #13
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    Quote Originally Posted by joecar View Post
    i.e. to see if 4th gear is commanding you should see engine rpm drop even tho the pid GM.TIS stays the same as for 3rd gear...

    take a log of these pids:
    - GM.TIS
    - GM.TOS
    - SAE.RPM
    - SAE.VSS
    - SAE.TP
    - SAE. MAP
    - GM.GEAR
    - GM.BOXRATIO
    - GM.TCCMODE
    Thanks I will get to it in a few days. I just had dental surgery today and am out on painkillers for some time .. lol

    Sent from my SAMSUNG-SM-G900A using Tapatalk

  4. #14
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    Quote Originally Posted by joecar View Post
    Do you also have the TCM wiring diagram that goes with that, I want to see if they agree.
    Yes the connector schematic I obtained while trouble shooting was the correct one for the tune and shows 4L80E and 4L60E options on the G3500 van T42 TCM. Everything else seems to be in the same spot as in the T42 Connector on the sloppy mechanics page. I'll verify again on GM site to make sure and convert them to images instead of PDF so I can upload on EFILive



    Sent from my SAMSUNG-SM-G900A using Tapatalk

  5. #15
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Mean Green Z28 View Post
    Thanks I will get to it in a few days. I just had dental surgery today and am out on painkillers for some time .. lol

    Sent from my SAMSUNG-SM-G900A using Tapatalk
    No worries, take your time, take care.

  6. #16
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    Quote Originally Posted by joecar View Post
    No worries, take your time, take care.
    Well the main difference I see for now is that the 2009 T42 Connector has 3 sets of the GMLAN Serial Bus signals coming to it while the older Connector shows only 2 sets. Would that cause any issues? the Circuit number for them all is 2500/2501 ... the only other changes are the TFP Switches (A,B,C) and where the ISS Low signal is terminated (26 vs. 45).

    If I was to add the two GMLAN signals to 15 and 19, can I just jump it off of the other pins or is there a chance that these area headed somewhere else? Ofcourse I have to verify with my year's connector be I say this is it. Haven't got access to the site yet.

  7. #17
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    Here we are!!! Everything converted to JPG so I can upload them

    2009 G3500 Transmission Connector
    Click image for larger version. 

Name:	2009 G3500 VAN Transmission Connector Pinout.jpg 
Views:	309 
Size:	307.9 KB 
ID:	20621

    2009 G3500 T42 Connector
    Click image for larger version. 

Name:	2009 G3500 VAN T42 Connector Pinout.jpg 
Views:	292 
Size:	466.9 KB 
ID:	20624

    2009 Silverado Transmission Connector
    Click image for larger version. 

Name:	2009 Silverado 4L60E Transmission Connector Pinout.jpg 
Views:	228 
Size:	268.9 KB 
ID:	20622

    2009 Silverado T42 Connector
    Click image for larger version. 

Name:	2009 Silverado T42 Connector Pinouts.jpg 
Views:	427 
Size:	373.3 KB 
ID:	20623

    Here's an easier pic with comparisons of each connector...

    2009 G3500 vs. Silverado T42 Connector Comparison
    Click image for larger version. 

Name:	2009 G3500 vs. Silverado T42 Connector Comparison.jpg 
Views:	301 
Size:	846.4 KB 
ID:	20632

    2009 G3500 vs. Silverado Transmission Connector Comparison
    Click image for larger version. 

Name:	2009 G3500 vs. Silverado Transmission Connector Comparison.jpg 
Views:	269 
Size:	568.7 KB 
ID:	20631
    Last edited by Mean Green Z28; January 13th, 2017 at 06:51 AM.

  8. #18

  9. #19
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    So I opened up the scanner tool and started saving up a pid file ... most are invalid?

    Click image for larger version. 

Name:	T42 PIDs.JPG 
Views:	261 
Size:	56.8 KB 
ID:	20633

  10. #20
    Joe (Moderator) joecar's Avatar
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    Thanks for posting above pdf's.


    Quote Originally Posted by Mean Green Z28 View Post
    So I opened up the scanner tool and started saving up a pid file ... most are invalid?

    Click image for larger version. 

Name:	T42 PIDs.JPG 
Views:	261 
Size:	56.8 KB 
ID:	20633
    In scantool go Info->Validate Pids

    ( unless T42 does not support those pids, which does not help at all )

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