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Thread: lly tcm j1939 messages

  1. #1
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    Default lly tcm j1939 messages

    this is a new set of tables in the lly stuff, what do they do? it seems as if it gives some flexibility with the defuel stuff when the tcm requests it, but it changes it in the ecm. i like it and have tried it but it seems to not work. or i did it wrong. i had set it to g0801-4000 rpm, then g0802-2500. basically saying under 2500rpm don't acknowledge the message from the tcm and ove it do the defuel. but it did npt work for me. any thoughts?

  2. #2
    Lifetime Member vortecfcar's Avatar
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    This handy new table didn't work on any 5 speed I've tried it one either :(... for the record.

    I like the idea though, if we can get it to do it's thing.

    Nick

  3. #3
    Lifetime Member Cougar281's Avatar
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    Worked on mine when I set it to "Torque Limit Req Disabled"...

    D5194 & D5195 are 8.1L only though (according to the description)....

    Edit: I'm stoopid... Maybe I should read slower . Changing the TCM worked, I haven't tried the ECM, although I think a table or two dissapeared. I thought there was one in the ECM tune that had the same options as the TCM (Like D5197 in the TCM).

  4. #4
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    there is a new table in the latest download that basically tells the ecm to ignore the tcm request unless x,y,z parameters are met that you set up. it would be very nice to have them working. this way you can leave a defuel on in the tcm, and have it ignored in the ecm for low speed, normal driving when your not making huge torque.

  5. #5
    Forum tyhee Site Admin GMPX's Avatar
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    I think the issue is the LLY ECM was used with two TCM types, the Allison TCM and the T42 (for the 4L80E), then the Allison TCM was also used on the 8.1L gas motor.
    It's probably a situation where certain vehicles / transmissions will use the J1939 messages for torque control whilst others don't.

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
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  6. #6
    Lifetime Member Cougar281's Avatar
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    Quote Originally Posted by GMPX View Post
    I think the issue is the LLY ECM was used with two TCM types, the Allison TCM and the T42 (for the 4L80E), then the Allison TCM was also used on the 8.1L gas motor.
    It's probably a situation where certain vehicles / transmissions will use the J1939 messages for torque control whilst others don't.

    Cheers,
    Ross
    Maybe I'm , but where did they LLY ECM get used with a T42/4L80E? Isn't the only Duramax application using the 4L80E the vans, and didn't they come out in 06 with the new LBZ/LMM style Bosch ECM?

  7. #7
    Forum tyhee Site Admin GMPX's Avatar
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    I'm allowed to make dumb comments every now and then
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


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