Loosing 4th once converter is locked

[joecar]

Set D6031 to 95%...

if that keeps the TCC locked (as far as you can tell via SOTP) then keep it there...

i.e. the TCM will still "slew" the TCC, but the slew range will be 95%-98% rather than 34%-98%...

Anything above 85%-90% usually locks the TCC (i.e. no slip).

[slow67]

Set D6031 to 95%...

if that keeps the TCC locked (as far as you can tell via SOTP) then keep it there...

i.e. the TCM will still "slew" the TCC, but the slew range will be 95%-98% rather than 34%-98%...

Anything above 85%-90% usually locks the TCC (i.e. no slip).

I usually set mine to 99%.

[alian]

Will do and see how that goes.
Cheers Ian

[alian]

Ok, Time for an update. I finaly got out to do some more testing. Set D6031 up to 97%, Made no difference at all, still went from lock for a milli second to slew and held that for 5 mins before unlocking and going back to third. We are going to try changing out the stall to a TCE over the next week or so and see how that goes. We are thinking that the stall is not allowing full lock up and after trying for the 5 min or so it lets go.
Cheers Ian

[Taz]

Hello Ian,

Quickly reviewed this entire thread … I had posted a diagnostic type tune with a disabled 4th gear Hot Mode - in post #5. In post #8 you posted a response, that while using this diagnostic tune the transmission “didn’t lose 4th at all”.

Did the convertor also remain locked during the test drive with this tune ? If so, then it is not the convertor preventing a lock (or failing to remain locked) - but the tune, TFT sensor, or other (yet undiscovered) factor.

Just wanted to clarify this point with you - don’t want to see you needlessly going through all of the effort (time, money, & inconvenience) of replacing the convertor - only to have the underlying problem remain.


Regards,
Taz

[alian]

Hey there Taz, I will go back over it and check again. I have done so many things now that my head is fried, And only have limited time to do things, hence the delays to test.
Thanks heaps Ian

[JezzaB]

UPDATE: New gearbox was put in and a new, tighter converter and its the same.

[joecar]

Are any of the bits on in the pids TSTATE09 and TSTATE10...?

[Taz]

I was concerned with that potential outcome .......


My condolences,
Taz

[alian]

Me to Taz. By changing the auto aswell it change the Trans temp sensor so now that is out of the picture now 2.
Ian