my torque converter is a wimp

[LB72004]

so i think i figured out why the TCC wont lock when in cruise control. doing some testing i found if i had the TCC release set to unlock at 0% throttle to enhance coasting it would not allow the TCC to lock unless i played with the peddle first and got it to lock then engaged CC. it would still kick out at the slightest hill though. quite a bit different behavior than the 5 speed. my 5 speed will do what i tell it to do. this one seems like a guessing game

need to do some more testing and tune adjusting as i still doesnt want to lock while accelerating.

i currently have the TCC lock set to 1 MPH less than the upshift. thinking that the TCC should stay locked the whole time in gear but it doesnt.

[asmithIII]

How did you log tcc slip?
I believe that tcm OS is in my 08 and I'll post a stock version for you.

[LB72004]

thanks, just make sure it is a full read. i hear it may take about an hour or so to read the full OS

the scan tool has a pid for TCC slip that shows it in RPM. it is just reading the RPM before and after and subtracting the after RPM from the before RPM. i also monitor the TCC PSI to see when it is locked then look at the RPM for slip, otherwise it will show lots of slip with it unlocked, so you need to see when it is locked.

the biggest problem i am having with logging the transmission is i cant get any of the speed (VSS) pids to work. makes it harder to understand what it is doing when you cant reference the logged data to any MPH

[LB72004]

anyone want to look over this log and give me input

still doesn't lock reliably but once it is locked it seems to stay locked much better then before.

thanks Jason

[asmithIII]

My OS is 25836826

If possible, I'll try a full scan. Any advice in doing a full read of the TCM would be appreciated.

[THEFERMANATOR]

Full reads of A40's aren't available yet. I believe full reads of A50's is, but A40's wasn't last I checked. I know a friend of mine tried this with the latest release, and ended up going to GM and having his new TCM flashed as he couldn't get a full read.

[LB72004]

According to this it sure seems like it is supported.

http://www.efilive.com/latest/al5-a4...ssion-support/

Unless I am mistaken, it seems that back in June of this year full flashing was added in an update

[LB72004]

so after reviewing my logs it seems that i am running into the infamous 600 RPM slip limit. somewhat embarrassing, should have seen this sooner

[LB72004]

ok, maybe not. now it looks more like it is related to throttle position. i don't know, i'm confused...

[THEFERMANATOR]

According to this it sure seems like it is supported.

http://www.efilive.com/latest/al5-a4...ssion-support/

Unless I am mistaken, it seems that back in June of this year full flashing was added in an update

The last paragraph,

Full flashing support for the 2006-2009 A40 Transmission has also been added to this release. This feature is ONLY available in EFILive V8 Scan and Tune software and is a free update for existing customers. Stay tuned for further updates because over the coming months we plan to modify the read options for the A40 TCM to allow both the current option of a calibration only read, and a new option to 'read entire.'

They do NOT currently offer full reads, only cal reads like they have been doing. Full reads take up to an hour for the A40/A46. They DO offer full flash capability IF you can obtain a full read using 3rd party software. The link only says they have full reads for the A50 which is mid 09+. And will be adding soon the option for full and cal reads for the A40 in the future.