stumped, 4l80e TCC lock up issue
Thread Starter
Joined: Nov 2013
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From: Portlandia
stumped, 4l80e TCC lock up issue finally getting somewhere with tuning this turbo truck and it's a hoot! lights the 255's in any gear, at any speed on 7psi.
but I'm still wrasslin the 4l80e to work correctly.
my current problem is the TCC will not lock up on it's own.
I can command it in the HPT scanner and it works fine so mechanically and electronically things on the trans side are ok.
I have doen some searching around and found that false misfires from a big cam will prevent lock up, so I maxed those tables as recommend here
http://www.hptuners.com/forum/showth...C-Lock-up-help
however they're talking about an e67 pcm and t42 tcu, so I dont have the ability to try the other fix they recommend, which is disabling the Min TPS Throttle Release.
I'm using an 0411 pcm with a 3 bar SD with RTT.
Assuming my TCC brake switch is wired correctly (will verify asap) what else can prevent lock up? ECT? My ECT is around 160*F on the freeway
Thanks for the help!
but I'm still wrasslin the 4l80e to work correctly.
my current problem is the TCC will not lock up on it's own.
I can command it in the HPT scanner and it works fine so mechanically and electronically things on the trans side are ok.
I have doen some searching around and found that false misfires from a big cam will prevent lock up, so I maxed those tables as recommend here
http://www.hptuners.com/forum/showth...C-Lock-up-help
however they're talking about an e67 pcm and t42 tcu, so I dont have the ability to try the other fix they recommend, which is disabling the Min TPS Throttle Release.
I'm using an 0411 pcm with a 3 bar SD with RTT.
Assuming my TCC brake switch is wired correctly (will verify asap) what else can prevent lock up? ECT? My ECT is around 160*F on the freeway
Thanks for the help!
You aren't the only one with this problem man. I did quite a bit of searching before my 4l80e swap and saw this issue brought up several times with the segment swaps. I decided to skip out on the segment swap all together and do the relay mod instead. Super simple and no segment swap required, maybe you should give it a try.
RyanR
RyanR
Thread Starter
Joined: Nov 2013
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From: Portlandia
12202088 was the original OS. I have another 80e segment, maybe i'll try the other one.
its funny every other 4l80e swap ive done has been a snap. the one i actually use a 4l80e harness for bites me in the ***.
its funny every other 4l80e swap ive done has been a snap. the one i actually use a 4l80e harness for bites me in the ***.
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Thread Starter
Joined: Nov 2013
Posts: 6,389
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From: Portlandia
didn't get a chance to play with the turbo truck today. but I was thinking I could in a pinch, rig a toggle switch to ground pin "S" and that oughta lock it for highway use.
not very elegant, but if it's really a problem with the segment i'll have to source another pcm or OS swap this one.
not very elegant, but if it's really a problem with the segment i'll have to source another pcm or OS swap this one.
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A little off topic but but as far are the tcc unlocking, does yours unlock when you lift off the throttle. I have tried all kind of settings in mine and many setting of others I found in threads searching and nothing has worked for me. If I get less than 2% tps my tc unlocks. I see your setting there in the throttle release pic, I guess I'll try yours but they look stock?
Last edited by Firebirdmuscle; Sep 27, 2016 at 10:19 PM.
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
verified continuity from pin 33 - blue to brake switch. 12v constant until brake depressed.
reflashed with a different segment, but same 12202088 OS native to this PCM
I can still command a lock up from the HPT scanner so I think I'm good mechanically and electronically. My problem is either in the tune parameters or the segment itself.
I noticed that i'm still getting MAF codes (MAF disabled, but codes active so it defaults to the main VE) that light my MIL despite setting them to no MIL. it doesn't cause a limp mode, but i clear them and they come right back, lighting the MIL.
Another theory I have is that due to my 3600 stall and hd2 kit, the high and low speed VSS parameters as stock are inhibiting lock up.
My next step is to flash a more common OS to a spare PCM and see if that works. But then I'm out another 4 credits if that doesn't fix my problem.
reflashed with a different segment, but same 12202088 OS native to this PCM
I can still command a lock up from the HPT scanner so I think I'm good mechanically and electronically. My problem is either in the tune parameters or the segment itself.
I noticed that i'm still getting MAF codes (MAF disabled, but codes active so it defaults to the main VE) that light my MIL despite setting them to no MIL. it doesn't cause a limp mode, but i clear them and they come right back, lighting the MIL.
Another theory I have is that due to my 3600 stall and hd2 kit, the high and low speed VSS parameters as stock are inhibiting lock up.
My next step is to flash a more common OS to a spare PCM and see if that works. But then I'm out another 4 credits if that doesn't fix my problem.
Thread Starter
Joined: Nov 2013
Posts: 6,389
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From: Portlandia
played around with the VSS parameters, nothing doing.
guess i'm gonna flash this other PCM I have to a more common OS.
if anyone has anything else to look at first, please chime in.
guess i'm gonna flash this other PCM I have to a more common OS.
if anyone has anything else to look at first, please chime in.
Why do you have everything in the 0% TPS column set to 255 in the apply/release table? That is not the way a stock 4L80 calibration is. I'm not saying that is your problem but it looks odd.
Thread Starter
Joined: Nov 2013
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From: Portlandia
I dont know, haha those values were there when I swapped trans segments so I assumed they were there on purpose.
I swapped to a 12212156 OS from my other 5.3/4l80e swapped truck and will copy over the 4l80e parameters in that which work excellent.
if you have an example of a stock 4l80e tune for the 12212156 OS, please share it or some screen shots of how the apply/release ought to look.
I have noticed that during certain segment swaps data is lost or transposed incorrectly. my main VE table defaults to 552 en every cell when I swap a trans segment.
fingers crossed I can get this to work
I swapped to a 12212156 OS from my other 5.3/4l80e swapped truck and will copy over the 4l80e parameters in that which work excellent.
if you have an example of a stock 4l80e tune for the 12212156 OS, please share it or some screen shots of how the apply/release ought to look.
I have noticed that during certain segment swaps data is lost or transposed incorrectly. my main VE table defaults to 552 en every cell when I swap a trans segment.
fingers crossed I can get this to work
Pro tip. When you refer to an OS # give the vehicle type and MY so it narrows down the search for others trying to help. And I've done a lot of 80 segment swaps with Tunercat OBD2 and never have those issues you describe. Just copy what is in the 6.3% column to the 0% and it will look normal.
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
Pro tip. When you refer to an OS # give the vehicle type and MY so it narrows down the search for others trying to help. And I've done a lot of 80 segment swaps with Tunercat OBD2 and never have those issues you describe. Just copy what is in the 6.3% column to the 0% and it will look normal.
Hey thanks for the heads up. Will do.
Doug
Thread Starter
Joined: Nov 2013
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From: Portlandia
ok so the new OS (12212156) is from a 2002 silverado 1500 that was originally a 4l60e tune. I segment swapped it with segment 9358280 to a 4l80e after the 2nd "built" 60e died. Aside from bolting it in and some wiring changes, i changed shift speeds and it's been a champ.
So now I've copied that tune over to my turbo truck pcm and upgraded to a 3 bar OLSD.
I did as you suggested and copied over the second column figures to the first column...excluding the 2nd gear row. I can't imagine needing a lock up in 2nd ever.
I did max the idle misfire tables as previous, thinking that it really can't hurt. (can it?)
Now time to flash it and give 'er a test drive!!
So now I've copied that tune over to my turbo truck pcm and upgraded to a 3 bar OLSD.
I did as you suggested and copied over the second column figures to the first column...excluding the 2nd gear row. I can't imagine needing a lock up in 2nd ever.
I did max the idle misfire tables as previous, thinking that it really can't hurt. (can it?)
Now time to flash it and give 'er a test drive!!
Thread Starter
Joined: Nov 2013
Posts: 6,389
Likes: 558
From: Portlandia
it locked up once, but wont do it again 
i now think it's related to the maf code i keep getting
P0102, despite having it set to no MIL light, SES not enabled.
sigh, back to the drawing board!
i now think it's related to the maf code i keep getting
P0102, despite having it set to no MIL light, SES not enabled.
sigh, back to the drawing board!
Last edited by truckdoug; Sep 29, 2016 at 10:24 PM. Reason: lost lock up :(