d2903 factory set at 10?

[joecar]

TCCDC seems to be about 35% and TCCSLIP peeked at 70rpm while TCCmode is LOCK

D2905 was set from factory to be 0 when TCCslip is 0. I will change that aswell.

D2905 immediately around zero slip won't make much difference since this is the rate at which TCC pressure is ramped up (i.e. psi per second of ramp up)... if the TCCSLIP happens to be zero (usually is not) when the PCM decides to command TCC lock, then the TCC will lock easily without requiring the ramp up to be faster... but it won't hurt to try it.

[Ritch]

moving d2904 and d2903 made a huge difference.

[joecar]

That does make a lot of difference... ...that will improve the life of the TCC.

Take some more logs: get to 4th gear and get more throttle.

[Ritch]

newbie question

How to you set autoscan to display entire log on one screenshot? I'll look it up.

Anyway, I found the slipping test parameters, but previous log showed ripple at 20% not 10?

This is my progress thus far, still too rough on up-shift, and TCC lock-up is sharp enough to cause drive-line flap at light throttle. Especially important in quiet neighbour hoods.

[joecar]

You mean to see the whole log in the scantool chart... see button "All" circled in red in attached pic.

[joecar]

You mean the slipping test parameters E0801,2,3,4...?

Those are for the transmission slipping in gear, not the TCC slip...

Altho I think for the 4L60E the PCM has to lock the TCC in order to perform the trans-in-gear slipping test.

[Ritch]

That was easy, thanks again.

I think I need to calibrate the force motor current to match actual line pressure. That way might help. I assume line pressure may be different than what the force motor setting are adjusted for. I really noticed a big change when I leveled out the trans press/temp adjustment. For now, I am adjusting the force motor tables by 10% at a time...using the old seat-o-meter.

[Ritch]

TCC does freeup when I let off the thottle. I wish it wouldn't.

[joecar]

In post #14, that's a good log, it shows:
- 2 rpm or less TCCSLIP when locked,
- TCC locked during upshifts,
- TCCMODE going to Coast,
Very interesting log...

Reduce your pid channel count to 24 or less to get faster pid update (10 Samples/second instead of 5 S/s)...
[it seems to me that a rapid TCCMODE pulse may have been missed because of 5 S/s]
Remove the following pids (they don't tell us anything):
- TRQTRANS,
- SHIFT32,
- MFCSTAT,
- MFABNORMAL,
- TSHIFT.

Good log, thanks for posting...

[joecar]

...

I think I need to calibrate the force motor current to match actual line pressure. That way might help. I assume line pressure may be different than what the force motor setting are adjusted for. I really noticed a big change when I leveled out the trans press/temp adjustment. For now, I am adjusting the force motor tables by 10% at a time...using the old seat-o-meter.

Have a look at the Torque Signal hydraulic circuit in this diagram (bright yellow, see detail 1c and 1a): showpost.php?p=39472&postcount=4

the TFM (aka PCS) regulates Torque Signal pressure which biases the Boost Valve which (via the Isolator Spring) assists the Pressure Regulator valve in regulating Line Pressure...

i.e. the Torque Signal pressure range 0-96 psi maps to a Line Pressure range of something like 55-230 psi (or so)...

it's not easy trying to calibrate the TFM/PCS Current table(s)...

I assume you have not altered the screw setting in the back of the TFM/PCS...