LLY trans tune in 02 LB7

[Chevy1925]

So I'm playing around with different trans tunes just seeing how they learn and such when I gave an 05 LLY trans tune a go.

So far I like the way it's shifting but obviously I have the code for no G solenoid and a check engine light on for it. I found it interesting the D won't highlight either but everything else will on gear selection lol

Any way to kill the code? And will it affect shifting while its on? I didn't see much in efi live for killing he code and I have the solenoid "turned off" so to speak by changing the setting in efi live.

 

[yellowchevy]

I would have thought EFI live could disable but then again the TCM is something to not shut items off willie nillie.

Did you figure it out yesterday?

You could just put a piece of black tape on your cluster!!:thumb:

Yellowchevy

 

[OregonDMAX]

I would have thought EFI live could disable but then again the TCM is something to not shut items off willie nillie.

Did you figure it out yesterday?

You could just put a piece of black tape on your cluster!!:thumb:

Yellowchevy

Or we could put a piece of tape over your mouth :hug:

James does ODLO work with that 05 tune or no?

 

[duratothemax]

ODLO will not work at all if you put an 03-05 tune in an 01-02 truck.

03-05 TCM calibrations are programmed to receive ODLO select via a data bus message from the BCM (after you press/hold the tow/haul button) only...they have the discrete "ODLO switch" input on the TCM connector disabled.

And an 01-02 BCM wont know to acknowledge a long press from the tow/haul button because it was never configured for it.

So there is no way to do ODLO with an 03-05 TCM in an 01-02 truck...

As for the code, EFILive does not have any DTC support mapped for any of the Allison TCM's, which is too bad.

 

[Chevy1925]

I would have thought EFI live could disable but then again the TCM is something to not shut items off willie nillie.



Did you figure it out yesterday?



You could just put a piece of black tape on your cluster!!:thumb:



Yellowchevy

Not yet and no way. That would drive me even more nuts!

Or we could put a piece of tape over your mouth :hug:

James does ODLO work with that 05 tune or no?

ODLO will not work at all if you put an 03-05 tune in an 01-02 truck.

03-05 TCM calibrations are programmed to receive ODLO select via a data bus message from the BCM (after you press/hold the tow/haul button) only...they have the discrete "ODLO switch" input on the TCM connector disabled.

And an 01-02 BCM wont know to acknowledge a long press from the tow/haul button because it was never configured for it.

So there is no way to do ODLO with an 03-05 TCM in an 01-02 truck...

As for the code, EFILive does not have any DTC support mapped for any of the Allison TCM's, which is too bad.

Yeah it doesn't work. I also noticed after 3 key cycles the tcm reverts to "tow/haul mode" only and won't come out of it unless you do a cal flash again, then after 3 key cycles it goes back.

Guess I'll be going back to my 02 tune

 

[duratothemax]

Yeah it doesn't work. I also noticed after 3 key cycles the tcm reverts to "tow/haul mode" only and won't come out of it unless you do a cal flash again, then after 3 key cycles it goes back.

Guess I'll be going back to my 02 tune

Huh, no kidding. Thats weird...ive never heard of anyone running a newer OS in an older truck though, so maybe its just that no one had discovered that yet.

Other than reverting to tow/haul mode, is there anything else weird that occurs when it "defaults"?

Have you tried running a 2003 LB7 TCM OS to see if it does the same thing?

 

[Chevy1925]

Huh, no kidding. Thats weird...ive never heard of anyone running a newer OS in an older truck though, so maybe its just that no one had discovered that yet.

Other than reverting to tow/haul mode, is there anything else weird that occurs when it "defaults"?

Have you tried running a 2003 LB7 TCM OS to see if it does the same thing?

here is all ive found (you probably know most of this):

gear selector will highlight every gear selection accept "D".
shifts through the gears just as a normal truck would.
check engine light on for G solenoid.
after 3 key cycles, i loose "normal" mode and reverts back to "tow/haul" mode only.
ODLO wont work.
tow haul still works when pressed when "normal" mode is working.

when stuck in "tow/haul" mode, upshifts and down shifts become quick and it seems to no longer learn or if it is, its learning very minimally. 1-4th up shifts dont tie up but it feels like a built 4l80e. you get a kick forward on each shift and that up shift is very fast. 4-5th shifts smooth until under power and it will flair. it wont learn out of that.

when normal mode is working, the up shifts and down shifts slow some and they smooth out. i believe that to be more attributed to the fact the converter clutch is not applied though.

i ran an 03 OS back when brian and i swapped TCMs in his old twin turbo truck. once it relearned from his crap shifts (a holy c4 apply piston caused them), it shifted great. just didnt have ODLO. everything worked as it should too. have not tried one since though. As for the LLy tune, this is all with a couple days driving and around 50-60 miles of stop and go under it. the key cycle may be a fluke as its done it twice. Ill do a full reflash at lunch and see if that stops it. originally i did a full flash to get the LLY tune in, drove it and noticed it seemed to be in tow haul mode. i though maybe it was a medium duty tune. then did the cal flash to see if me changing the setting in EFI Live for the G solenoid would keep the CEL off. thats when i noticed normal mode coming back and kept track of when it would stop working. Clearing the code/s only, wont make normal mode come back.

 

[Chevy1925]

Did a full flash and it will not go back to "normal" mode. Even tried a cal flash after that.

I pulled the tune and went back to 02. It's making me uneasy and don't feel like snapping hard parts 2 days before I go to mikes lol

 

[duratothemax]

I wonder if its due to the lack of G-solenoid....have you tried wiring in a dummy solenoid on the G-solenoid circuit just for grins?

 

[Mike L.]

When the CEL is on with the G solenoid code the engine will run rough. Don't know why Allison did that.

 

[Chevy1925]

I wonder if its due to the lack of G-solenoid....have you tried wiring in a dummy solenoid on the G-solenoid circuit just for grins?

No, have not. What would I need Ben?

When the CEL is on with the G solenoid code the engine will run rough. Don't know why Allison did that.

Motor still ran great, not a hiccup in it. Just the strange mode issue

 

[THEFERMANATOR]

You probably weren't going into tow/haul mode, but instead going into hot trans shift mode. When the TCM detects trans temps over 250 degrees or so, it goes into a shift mode similar to tow/haul, but it snaps the shifts pretty abruptly. I had this happen to me once coming down a 4 mile 7% grade with a cold engine. No engine heat meant the stats were closed, and with no coolant flowing through the radiator, it didn't take long for trans temps to get up to 260 since I was only going 25-30 on winding downhills with 8500 pounds pushing me. When it switched to hot trans mode, it shifted rather abruptly to say the least. And when I tried the 05 OS in my BURB, it pissed the TCM off to the point it wouldn't move at all. Had nothing in any gear I put it in.

 

[Chevy1925]

That would more more sense firm, wonder why it thinks the trans is hot? Also explains why I had TC lock up this morning when the trans was cold

 

[THEFERMANATOR]

That would more more sense firm, wonder why it thinks the trans is hot? Also explains why I had TC lock up this morning when the trans was cold

It could be a protection algorthym in the TCM itself since the G solenoid is there primarily to help the trans run cooler at idle and low throttle inputs. If it thinks there is a problem in the G soelnoid circuit, it may go into protection mode.

 

[RPM Motorsports]

I'm running an 04 TCM in an 02, only issue I have is no illuminated "D". Shifts fine and no trouble codes. I only had 03 and newer tcm's laying around when I put the truck together. It was a $2k CL find that had a blown motor.

 

[THEFERMANATOR]

I'm running an 04 TCM in an 02, only issue I have is no illuminated "D". Shifts fine and no trouble codes. I only had 03 and newer tcm's laying around when I put the truck together. It was a $2k CL find that had a blown motor.

Is that an 04 LB7 or 04 LLY? If an 04 LB7 it will work fine in an 01-05 truck with no issues other than no OD/LO via the hardwired switch like 01-02 uses.

 

[RPM Motorsports]

Should have been more clear 04.5 requiring the G. Not sure why it hasn't coded on me yet, I figured it would right away.