TCC unlocking issue

[Tornadotech]

4l60e with TCC and LUF solenoids.

LUF is on the TCC PWM output and the TCC is on spare output for TCC, Running V4.125, convertor locks up properly when it's supposed to.
but even under a load it does not unlock unless I get on the gas enough to cause a 3rd gear downshift. If it would just unlock under an increased load it wouldn't have to downshift into 3rd. What is causing this? Or is this the way it is supposed to work. Or is this because I am using the spare output for the TCC, and I just realized that it isn't even unlocking when I press the brakes either, yes the brake input is working. Any thoughts?

[Bernard Fife]

Tt,

There certainly could be a problem in the code. This section was re-written a while ago, and not many people are using LUF, so it might have been missed. I will have a look. If you could post your MSQ and a datalog, that would be helpful. And did it work on any earlier code that you may have tried?

Lance.

[Tornadotech]

Yeah, I can post em. In the process of hooking up tach signal right now, and messing with VSS. I will post them as soon as I can get a fresh datalog. Thank you very much for all the work you have done so far.

[Bernard Fife]

Tornadotech,

I always feel a bit guilty when these things crop up, and I do my best to make sure they are sorted as quickly as possible. There was a bit of a change in the way TCC/LUF worked a while ago. It used to be that if you enabled LUF on the "TCC" output, it was PWM'd and the ON/OFF control was automatically enabled on spare port 2.

However, the current code is intended that setting 'Use PWM for TCC' (under 'TCC Settings -> Torque Converter Control Limits') turn the TCC output into a PWM'd LUF output, and *any* of the available spore ports can then be used for TCC (sp1 and sp2 will use a single user-specified PWM%, while sp0 will use the PWM% found in its 16x9 table - and this will value be updated continuously).

The documentation might not reflect this, so I need to go through that.

I have found some small bugs in the TCC code in looking for the issue you report, and fixing these may help. I will post updated code tomorrow or Monday.

Lance.

[Bernard Fife]

Tornadotech,

Here is some code to test:

Monitor_4125test.abs.s19

Uses standard 4.125 INI

(70.9 KiB) Downloaded 734 times

It is largely untested (but does unlock the TCC in 3rd with increased MAP), so use with caution.

I have found and fixed a few bugs in the TCC code, but these may not fix the particular issue you are experiencing. I will keep looking through the code.

Lance.

[Tornadotech]

Loaded that code. Gave it a try and logged it. Didn't actually get it to lock up. My VSS is still having some issues as seen by my logs.(I thought it was doing better than it was) So that explains the weird downshifting that it is doing. But, nonetheless, here it is.
I will try to get another log with some actual TCC once I can get this VSS sorted out. Thanks

[Tornadotech]

With the new v4.126 all is working well with the TCC. It works great now. Thanks.