How many volts should be going into the VSS on the back of a 4L80E

[MuddiGGEr25]

I know I saw that, but I don't have that kind of cash or time to wait for delivery atm. I will be out if work due to my back for at least 2 or 3 months while I go to physical therapy and to the chiropractor.  Pills are only doing so much good for me 

From what I can tell from reading diagnostic papers for the 4l80e. Under normal circumstances, when the TCM or pcm goes from 2nd to 3rd it just activates the 2-3 solenoid and adjusts line pressure according to load or TPS value. All other signals appear to remain the same from 2 to 3 except when at WOT or other programmed variables.


I'm gonna try it tomorrow and hope for the best.

[Irish_Alley]

good luck, im interested in understanding the 4l80e also

[MuddiGGEr25]

Well I learned that the solenoids are controlled via grounding at the PCM. So putting 12V+ would have done no good.. but that being said I checked my ign+ to the transmission and it was good. I tried to ground the 2-3 solenoid but no luck, it wouldn't click. So then I tried to ground the 1-2 solenoid and voila it clicks. So I checked voltage passing through the 1-2 solenoid and got nearly fully ignition voltage reading (about 11.8 to 11.9 bc my batteries are a bit low + resistance of the solenoid.)  Next I checked the voltage coming out of the 2-3 solenoid and it reads 1.80V so I'm pretty sure that solenoid is junk. 

I would have thought of it sooner but the video of the truck I saw before the engine was dismounted was only 30 seconds long and it just drove around the property. Probably never over 30mph. And he told me no guarantees on the transmission.

In any case I might leave the toggle connected so I can manually get into 1st gear if I need it, otherwise 2nd will be good enough for the moment.

We had a change of plans with family memyers having surgery and cancer not going into remission so we are going 50 miles north to a campground for about 430/mo until all that is sorted out. I'll get some work soon and order a solenoid and figure out how to change it without anyone figuring out I'm dropping the pan at a campground lol.


Next I can figure out if the TOSS is giving a good signal to the PCM or not ha.

[MuddiGGEr25]

Update: took 54 hours to go 63 miles because top speed was 35mph and the fuel pump would overheat bc if poor placement on my part. Then 30 minute cool down every 2-3 miles.

Then 6 miles away from our destination  I think the tcase went kaboom. There was a few loud clunks then we stopped moving. Then I crawled under and moved the tcase to manual nuetral and the transmission too and it was grinding for the first couple miles then no grinding. If I start it and put it in gear you can hear the transmission start winding up but no movement. And i can not disengage the rear shaft when I try to manually shift into N on the tcase. The front shaft releases in 2hi but in the N position it still seems to be hanging on to the driveshaft