tcc cooked or ?

[TZTuning]

tcc-1.hpl - noticed slip was higher than normal

24-02-11 10-30-44.hpl - normal slip rate for normal driving

both logs were taken today. the one not named was
the first drive today and i stopped for a bit than took the other and it replicated the issue on it


2000 gmc sierra of mine, 5.3 4l60e . noticed yesterday something didnt feel right when driving. logged it this morning and i found the issue. tcc slip is running higher than normal on the log named tcc-1 it shows slip and eventually it falls to normal after going down a hill at steady throttle. on the other log that is normal driving and normally what i see for slip.

if i command tcc pwm or tcc solenoid on in special functions tab i can feel it lockdown solid, but when i unlock i feel it release slightly.

tcc duty cycle is at 80 minimum and 100 maximum. has been this way for months and no issue until yesterday. fluid is full, not dark or burnt smelling.

about my luck that the converter would crap out on me.

what do yall think.?

[TZTuning]

tcc crap.hpl

trans gmc brown.hpt

tune and log attached on this log it locked up perfect the first time, then when i stopped and took back off it was slipping while locked

[hjtrbo]

Can't diagnose fuck all without the pcs and tcc press channels. Also add ISS and OSS. Wind up the polling interval on all those channels to at least 20Hz

Ah crap:
Assumed 6L80, ignore my comment, sorry bud.

[TransGo Robert]

tcc crap.hpl

trans gmc brown.hpt

tune and log attached on this log it locked up perfect the first time, then when i stopped and took back off it was slipping while locked

For some reason the computer commands that slip on purpose when it starts to slip. I don't know enough about tuning unfortunately to know what is causing this but it is definitely commanding it like OE at that point where it start to slips 20-30 RPM. You can see the duty cycle % command drop to +/- 40% from the +/- 50% before when it would lock completely. Something is changing somewhere on one or more of the computer inputs causing it to change its command, but I don't' know what it is.

[GHuggins]

tcc crap.hpl

trans gmc brown.hpt

tune and log attached on this log it locked up perfect the first time, then when i stopped and took back off it was slipping while locked

FWIW, you lowered line pressure on your force motor current table, slightly increased it via the MAF, but then the VE is slightly lower. Not sure how all of that will play out, but maybe the problem? The force motor table that is...

[TZTuning]

Appreciate the feedback. I went back in and made some changes and now it’s holding 80+% on Tcc duty cycle and holding firm lockup.

[TransGo Robert]

Appreciate the feedback. I went back in and made some changes and now it’s holding 80+% on Tcc duty cycle and holding firm lockup.

Good deal