I am running the super AUJP bin on my new engine and it is keeping the TCC locked at way to low speeds and it won’t unlock until I give it a lot of gas. It will shutter when I try to accelerate and the TCC locked at low speeds.


I am confused about the TCC constants in the AUJP bin. First the “TCC lock speed” and “TCC unlock speed” don’t seem to change anything; the TCC will still lock under the speed I set it to. When does the ECM use these settings?

Second the TCC tables are a little confusing to me. Below is a picture of the stock AUJP TCC tables for low gears. I want to make sure I understand how it is working correctly. For example at 28MPH is it saying that at anything higher then 9% TPS the TCC will lock and anything higher then 19.9% TPS the TCC will unlock? A.K.A Between 9-19.9% TPS the TCC will be locked? Then what happens at 76MPH+ since both tables are the same valve, will the TCC stay unlocked?

 

opps forgot pic

 

89 Iroc Z,
I am not using TC so I'm a little confused at this (at least now I am)
My "thought" was that the TCC lockup would occur UNDER the %TPS in the table and then unlock OVER the other setting in the unlock table.

Now the confusing part,
I use TunerPro RT and S_AUJP (v2) with the Super_8dm*.ecu file.
There is no %TPS qualifier for the lock/unlock settings. It is strictly a MPH setting.
There was an ECU definition file I had previously that indicated the settings the way you have them, I dismissed it as being another "rough" version of a definition.
My TunerPro screen is like the pic attached.
Is there a coded %TPS qualifier still in the mix when using the MPH (bit unchecked) in the $8D mask???
Someone please jump in and add some clarification if you would.
Thanx

 

TCC will lock at TPS readings at and up to the values in the lock table

TCC will unlock when it sees the values in the TCC unlock table and above.(or x pedal movement in like 12 milli)

Drop the TCC unlock percentages in say half, but slightly higher than the lock percentages and go dirve it,, it will make more sense.

Also look at several different bins for your engine type and try copying one or tow of those. vette tables are drastically different than an f body

later
Jeremy

 

Thanks for the input guys.

3.8TransAM,
Can you explain it a little more, give an example with values? Can verify that my explanation of the tables is in fact how they work?

 

Forgot one thing, if using TC make sure you have the latest edition, bout year or so ago they actually had the tables reversed, drove me crazy till I figured it out......


Best example is here, say at 60mph TPS lockup is 35%, at 35%throttle and down at 60mph the converter will lock and remain loccked for the duration.

If at 60mph the TPS unlock is 60% the converter will lock at the aforementioned 35% and stay locked until u exceed 60% TPS at 60mph.(from 35% tps to 59% tps it will remain locked, then unlock at 60%)

Think of the lockup points as that, at that % and down it will remain locked , it will not unlock until u see the corresponding TPS % in the TCC unlock tables

hope that helps

Compare some bins and it will make more sense
later
Jeremy

 

Okay I think I understand the TCC tables. What about the lock up constants “TCC lock speed” and “TCC unlock speed”. When does the computer use the constant valve instead of the table’s data?

Do you meant that % and up as in a higher number not that % and down?

 

Go play with the tables like i mentioned earlier, will clear up the question your asking :-) Dont know how to import a picture that was drawn to show it to me or else i would....


The TCC lock mph and unlock mph are just that, what mph u would like it to allow lock up at and under what mph you want it to stay unlocked at

later
Jeremy

 

If the converter is unlocked, the ECM only looks at the lock tables. As soon as you are over the MPH and under the TPS, it will lock the converter. Once it's locked, the ECM ignores the lock tables, and looks at the unlock tables instead. If TPS gets above the unlock point, or MPH gets below the unlock point, it will unlock. Then the ECM starts looking at the lock tables again.

If you're over the "unlock prevention speed" it will stay locked all the time.

At least that's my understanding of how it works.

 

I think I found the problem and it is not ECM related at all. When I was having problems with my TCC my transmission builder sent me a new TCC solenoid and a 4'th gear switch and told me to short circuit the terminals on the temp switch and just remove it. After looking at the wiring diagram it looks like it is just causing it to lock the TCC every time it goes into 4'th no matter what throttle it is at.

So the tables are probably fine.