4l80e pcs or general solenoid Q

[DaveP]

Re: 4l80e pcs or general solenoid Q

yup, i had it on jacksstands. and drove the piss out of it. did manual. dynomode in 1 and 2th rpm and miles staid the same. using the tcc lockup even makes it easier to find gears. so 1 and 4 are not working.

It could still be wiring.

Is sol A at 12Volts with the key on, eng not running?
If yes, ground sol B. NOW check A again. If A is now 0volt, the wiring on B is transposed.

You said the 'audible' on A was "funny". This could be why.

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

It could still be wiring.

Is sol A at 12Volts with the key on, eng not running?
If yes, ground sol B. NOW check A again. If A is now 0volt, the wiring on B is transposed.

You said the 'audible' on A was "funny". This could be why.

solenoid A should be at 12volts with key on in all ranges? PNRD321?

 

[Quickstop [UK]]

Re: 4l80e pcs or general solenoid Q

I think yes as the PCS unit provides a ground signal to the solenoid, not +12v

 

[DaveP]

Re: 4l80e pcs or general solenoid Q

solenoid A should be at 12volts with key on in all ranges? PNRD321?

With engine not running, yes. Both solenoids should be at 12V.

 

[Quickstop [UK]]

Re: 4l80e pcs or general solenoid Q

ooh oooh ooh...progress!

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

thanks davep, you are a big help.
anyway, here is the update. i tried new solenoids. i cut the pink and black and pink and red cable (soneloid cables going too the pcs controller). installed new solenoids. and these got 12v on them all the time, the controller gives out 12volts too put it on or off. so bassicly with the wires cut i have second gear.
here is what i have done.
ground 1 cable at a time (both solenoids are again clicking) than measure up the other loose cable to see if i still get 12v. still got 12v.
now when engine running i can make it shift from 2 too 3 with the pink black cable . but using the pink red cable nothing happpens, except a clicking solenoid. (while i ground the wires on seems to be more powerfull than the other. also when i had the pan off i could feel 1 solenoid getting hot, while the other remained cold.
i'm out of geusses. unless something else is ****ed.
prolly going to take off the pan again and measure again at the solenoid.
i never worked this much on a 700r4 than this single 4l80e.

 

[Quickstop [UK]]

Re: 4l80e pcs or general solenoid Q

so the solenoid is getting hot but the fluid isn't getting to the right part of the trans by the sound of it? would the solenoid be cooled by the fluid? if so, maybe a check ball is installed wrong?

I think the upgraded shift kit requires only 7 balls but the stock 80E comes with 8. Not sure if that may have something to do with it - if the builder forgets to remove one then that might block a passage and mess it all up?

Have you got the 80E technician manual? If it's not on the laptop then Renz has it or I can send you a cd of it.

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

yeah, i was reading that something else is controlling the fluid to go towards the solenoid, and than the solenoid is only let the fluid go, or hold it.
get renz to sent me the manual too rene at mcv.nu

 

[Quickstop [UK]]

Re: 4l80e pcs or general solenoid Q

asked mattw to send it - wil ask renz too.wish I had an ftp site as well

starting to think I need a trans rebuild.

 

[JSM]

Re: 4l80e pcs or general solenoid Q

if you replaced solenoids and you can hear them switch and still the same issue I would suspect a valve body issue next. Anyway to get another valvebody to throw in as a test? Stuck valve in there is my guess.

 

[Quickstop [UK]]

Re: 4l80e pcs or general solenoid Q

trans guy said he threw in a spare valve body that he had laying around and no change...
:dunno:

 

[Quickstop [UK]]

Re: 4l80e pcs or general solenoid Q

Rene, I can send you the ATSG manual for the 4L80E when I get back, or you can order it off ebay and I'll pay via paypal if you send the invoice to me?

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

if you replaced solenoids and you can hear them switch and still the same issue I would suspect a valve body issue next. Anyway to get another valvebody to throw in as a test? Stuck valve in there is my guess.

the only thing that concerns me a bit it that the right solenoid. got hot, and the other one remained cold. even though they both clicked.

 

[JSM]

Re: 4l80e pcs or general solenoid Q

If you take a spare solenoid you know works on bench can you see something move?

What about swapping the 2 solenoid locations now.

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

i don't think the solenoids can be put in wrong, since 1 solenoid has a left ear and the other one a right ear. but i might give it a try.
it's just a pita to take pan off. check install pan put oil in it. than to take the pan off, and do it again and again and again.
what happens if i would run the transmission for a short amount of time with the pan off? would the tc like that?

 

[JSM]

Re: 4l80e pcs or general solenoid Q

No pan, no fluid won't work at all.

I am no trans expert by any means....i just feel its a valve shifting issue. I think you confirmed the PCS is doing what it should be.

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

No pan, no fluid won't work at all.

I am no trans expert by any means....i just feel its a valve shifting issue. I think you confirmed the PCS is doing what it should be.

yes,. even without the 2 wires hooked up to the controller for the solenoids. like i can ground them by hand to engage, disengage by sticking the cut wire to ground. i have 2 to 3 but no 1 or 4.

 

[DaveP]

Re: 4l80e pcs or general solenoid Q

A couple of things:

I just took a spare solenoid for a 4L60e and put 12v to it on the bench. After about 60 seconds, it was warm (the coil itself) but not "hot".

When the solenoid energizes, it blocks the oil flow through it, and causes the shift valve to move into the 'shifted' position. In the experiment above, I also took this solenoid and blew through it with my mouth. When I energized it, it was obvious that the flow was blocked.

So: A hot solenoid doesn't seem correct. They can be checked by not being able to blow through them in the energized state. The valve it controls can be checked for sticking by 'picking' at it with a dental pick through the exhaust port (valve body removed), or pushing on it, and seeing if it springs back with the solenoid removed (valve body installed).

Maybe the shift valve is installed incorrectly, and can't 'apply' when the solenoid energizes.

And I get to put in my disclaimer, too. I'm pretty good with electrical, have a solid understanding of how the 4L60e works, and have owned several of them, but have never owned a 4L80e, and only worked on one electrical problem with one. It was a 91 with the harness connector problem I mentioned earlier in the thread. But the way a solenoid is used to control the shift valve itself is the same principal in any electronically-controlled transmission.

 

[bezerk]

Re: 4l80e pcs or general solenoid Q

i got a manual for a 4l80e now, if somebody is intrested,
anyway the powerleads going to the solenoids, is spliced inside the transmission, so with that if ruled out the solenoids power or electic. probl. that far.
so dave p. if i read up correctly if i take out solenoid ai could somehow try to feel with a screwdriver if the valve is stuck. correct??

 

[DaveP]

Re: 4l80e pcs or general solenoid Q

if i read up correctly if i take out solenoid ai could somehow try to feel with a screwdriver if the valve is stuck. correct??

Yes. Push on it, and it should spring back. Try to use something that won't scratch aluminum. Like a bic pen with a plastic end.