4l80e change gear completely opposite to what it should

[Ponrov]

22800
Need some advice.
4l80e change gear completely opposite to what it should at light acceleration gives it instantly up to 4 gears or when kickdown in 3 gears it also goes up to 4 gears
Have logd the sensors
TOS 7400 rpm
VSS 100km/h
TIS 4000rpm
Eng.rpm 4500rpm
Have changed the TOS sensor it's same after.

Br Ponrov

[joecar]

Post tune file.

Post some logs, including GM.TP.

Is TP signal ok...?

What year/model is the vehicle and the donor...?

[Ponrov]

Hi joecar

thanks for the response and you take the time to help.

Engine Pontiac 400 RAM Air lll controll with 0411 ECM
sensors on Engine.
76MM Throttle Body from L31 5.7 Vortec
TPS from L31 5.7 Vortec
Map from L31 5.7 Vortec
Maf 85mm from Tahoe 2000-2004
CKP from 1999 2000 24x L21 7.4L 454ci Vortec Gen VI BBC Engines
CMP Gen IV 24x 58x LS-Series Engines
ECM 0411 Road Runner
dual wideband Innovate LC-1 /DLG-1 and Innovate MTXD Etanol /fuel temp both connected to Efilive with Serial cabel , but only one wideband its programed yet.
4l80e trans from a Truck C3500 2000 year (will be modified with the shift kit from TRANSGO)
converter std from a Truck C3500 2000 year
axle 3.89:1
tire 275/45-18

2280722808
22808

br Ponrov

[ChipsByAl]

Interesting project, Ponrov. What vehicle did the harness come from? Or did someone build it for you? Is there a 4L60 to 4L80 adapter getting used?
Al

[Ponrov]

PAINLESS PERFORMANCE WIRE HARNESS 1996-99 GM VORTEC I have modified after Lexhech wire diagram to convert to 0411 ECM and its repin for the 4l80e transmission connector

[joecar]

In your tune, I see several things...

the WOT MPH upshift and downshift points are upside down;
the WOT RPM shift points are wrong.
the throttle kickdown tables should be 100% all across.

[Ponrov]

Thank you for your feedback.
Have not studied so much yet, but I will compare tune it with tune to as i found online 2002 Chevrolet Express Van Automatic L31 5.7L 4L80e 2wd (12212156) .

Br Ponrov

[joecar]

( some of the tables in some of the tunes are set "incorrectly" from the factory )

[Ponrov]

Hi Joecar
Thanks for feedback.
Is there possibility to find a trans. tune(4l80e) that one is sure is right

Br Ponrov

[joecar]

All the truck trans stock tunes that I've seen (4L60E and 4L80E) had something I didn't like (I was always able to improve upon them).

[Ponrov]

After testing something more, it turns out that after running about 1.5 miles, the gearbox works just fine.
Tried to just turn off the ignition and then start the engine right after then it works fine, but after stopping for 5 minutes to fill the tank then it has to run for 1.5 miles before it works right again.

[Ponrov]

the reason for 4l80e switching quickly up to 4 gears ,was that the connection C2 16 and 19 on the PCM were grounded.
so that PCM received signal that 4wd low range was enabled and front axle was engaged.

[joecar]

After testing something more, it turns out that after running about 1.5 miles, the gearbox works just fine.
Tried to just turn off the ignition and then start the engine right after then it works fine, but after stopping for 5 minutes to fill the tank then it has to run for 1.5 miles before it works right again.Odd... I don't see how 1.5 miles factors into anything.

[joecar]

the reason for 4l80e switching quickly up to 4 gears ,was that the connection C2 16 and 19 on the PCM were grounded.
so that PCM received signal that 4wd low range was enabled and front axle was engaged.That explains it... at street speeds in 4wd-lo you would be hitting the shift curves very soon, good job on finding it.

[Ponrov]

I use this program to program the 4l80e this was very nice to use , now it shift very smooth " https://forum.efilive.com/showthread.php?5876-Tool-to-help-tune-A4-shift-points"
Now it`s time to try to Calc.VET: correcting MAF and calculating VE (in single log) .
Br Ponrov