4l80e wiring?

[J-bird]

Hey guys,

I finally finished rebuilding my 4l80e and got it in the truck.

I think I have most of the wiring tied into the stock computer, I just need to finger out the tcc part of the wiring. I read that the older tci units need a relay on that circuit, and then I have read that its not necessary. if I have an older tci unit do i use the relay or do I just have to connect the brake lite wire in the tci harness to ALDL f terminal?

I was able to get fluid in the trans and make sure that the output of the X-fer case is turnning, but in the tci dash the trans temp fluctuates from -40 to 282 degrees. is there something that I should check on the temp, I installed a new internal harness in the trans that had a temp sensor built into it. Also I have a problem with the speedo in the tci program. It shows that im going 12-16mph when I'm in park. I have double checked that the TISS and TOSS plugs are in the right positions. what could be causing this to happen.

I don't have the drive shafts in the truck but I should be able to pick them up from the shop Thursday.

here is the log from the tci data log it really doesn't mean much to me yet but I was hoping that some of you guys could look at it and point me in the right direction.

I can't wait to finally drive this thing again, its been like 8 months since i put the new engine in and I only got 48 miles on the 700r4. So, yea I got blue balls for the red rocket!!

Thanks,

Jeremy Franke

 

[Houseofperformance]

Re: 4l80e wiring?

what does your unit look like - if it´s red with a round connector it´s already the new version, the old one was silver with a square connector. the old units use a relais to interrupt the tcc curcuit once you hit the brakes.

 

[J-bird]

Re: 4l80e wiring?

yea, it is red with the round style connector. So does this mean that I can just hook the brake lite wire to the f terminal on the ALDL? I think I might also try running my grounds back to the battery. there are tied up under the dash with a few other grounds so I might be have some ground interference.

Thanks for any help!!

 

[JSM]

Re: 4l80e wiring?

red box shouldn't need a relay, same as a pcs controller.

 

[J-bird]

Re: 4l80e wiring?

I guess the reason I'm confused is that I figure there would be a switch in the program to change it form a positive signal to a grounded signal, and I can't find anything related to this in the tci program. Should the box be configured correctly to begin with? It is supposed to already be programed by George Blake.

Also could a ground issue cause the mph in the TCI program to constantly read a few mph? and it looks to be directly related to the rpm of the motor.

Anther problem is that in any gear but revers the Trans Temp reads 280 degrees and when I put the trans in revers it reads -40 degrees. Could this also be related to ground interference.

Thanks,

Jeremy Franke

 

[Quickstop [UK]]

Re: 4l80e wiring?

You sure you got your wires done correctly? Maybe the heat and the mph wire switched round?

 

[J-bird]

Re: 4l80e wiring?

You sure you got your wires done correctly? Maybe the heat and the mph wire switched round?

the speed sensors are on the external wire harness to the TCI computer and the temp sensor is integrated into the internal wiring harness. I doubt that could be caused by my wiring, but you never know!

I think I'll move the grounds directly to the battery to start with, and hopefully I'll get a better idea of what is happening once I get the shafts back in.

 

[J-bird]

Re: 4l80e wiring?

Just and update.

I finally found the wiring diagram for the harness, and the TISS and TOSS were labeled incorrectly.

But still need to figure out the temperature sensor!

Later,

 

[J-bird]

Re: 4l80e wiring? pleas help!!

Re: 4l80e wiring? pleas help!!

This temp sensor thing has got me stummped!:rant:

I have checked the circuit that the sensor is on and it all checks out ok with VOM. I get 0.0 ohms at every connector and checked the entire loop by jumping pin 51 and 54 in the main connector at the control module and checking at the sensor plug. I have checked the continuity at the main plug against just the temp sensor and they are the same. this leads me to believe that this is a problem with the TCI TCU box itself! Does this sound right? I still se 280 degrees+ on the laptop dash!

Is there some kind of calibration I need to do for the sensor to work? I also think that there is a flash update for the tcu, could this make a difference?

I'm open to all suggestions, and any help available.

Thanks,

Jeremy

 

[Quickstop [UK]]

Re: 4l80e wiring?

have you emailed TCI to ask them? PCS were mega helpful.

That sounds like you're going from a HI to a LOW setting by switching from FWD to REV. 1 or 0, nothing in between.

I think in the TCI you can configure what types of inputs and outputs a sensor is calibrated for - ie digital or analogue.

In the case of a mid range voltage, maybe it is getting confused and jumping from one to the other? Why it would do it changing gears I can't imagine.

If they are the same box as the PCS then maybe you could find someone with a PCS box, or better still a TCI box and see if you can swap it in.

Anyone with a TCI unit that works on a truck that is down for a repair? I guess there aren't all that many people with 80Es on here....

You should have a calibration file and also a log file. Maybe you can email these to some people on here. I don't mind having a look at your calibration file. I'll need to download the software though from TCY but happy to. Got nothing else going on this weekend! rant

 

[UR50SLO]

Re: 4l80e wiring?

Not to go off topic but there's a place that makes this 4L80/60 thing real easy.

It'll become a manual shift but it's trick and cheap. under 300.00

http://www.rosslertrans.com/index.htm

Using Plug and Play Technology Convert any Gm Computer Controlled Electronic Transmission into a full Manual Shift Transmission Without Having to Remove the Pan or Valve body.

Now Accepting Orders at an Introductory Price of $295.00

Not exactly your solution but a option for people who just want to shift.
~Scott

 

[J-bird]

Re: 4l80e wiring?

I have e-mailed tci, but haven't heard anything back yet.

I downloaded the pcs program And there are way more options than the tci version but when I try to connect to the tcu it gives me an error. Is it possible to use the pcs software with the tci box?

The pcs software lets you see all the digital and analoge inputs and outputs, is there and option in the tci program to view this data?

 

[Quickstop [UK]]

Re: 4l80e wiring?

dunno...let me download the tci one and have a play...got your calibration file/log file??

mf_edwards at yahoo dot com

 

[Quickstop [UK]]

Re: 4l80e wiring?

got the tci programme, so send the log file and your calibration when you have a minute. I'll have a play over the weekend.

Is it a rebuilt trans? Maybe the wiring in the trans is messed up? :dunno:

 

[bezerk]

Re: 4l80e wiring?

quickstop his truck also showed speed while in park, f the rest is working i wouldn't worry about it, maybe a bug in the program

 

[J-bird]

Re: 4l80e wiring?

Quick stop,

I'll try to get it put back together and on the road and get a good log file for you!

bezerk,

I got the moving in park figured out I think the only problem now is the tans fluid temp is out of whack. I still need to hook up the tcc wire also.

Jeremy

 

[J-bird]

Re: 4l80e wiring?

Ok,

Just got this hunk of $@!# back to the shop! If anyone wants to look at the log file and my current setup file here it is!

The drive was cut short because the truck died about a mile form work, the ecmb fuse blew and I had to wait for my dad/boss to bring me a fuse.

This thing drives like dookie right now, so I hope someone can shed some light on the log/setup combo. Also It seams like I have no 4th gear, it will shift but it just dosen't feel right.

Thanks for any help!

Jeremy

 

[Quickstop [UK]]

Re: 4l80e wiring?

What stall do you have? If you have a higher stall and you haven't got your TCC locked in then it might not feel right in 4th gear.

In the file you only get up to 43 mph but TCC lockup is set at a minimum of 46 mph so that might explain it.

Your shift points/rpm correspond withe the settings in the calibration file so it is commanding the upshift and downshift at the correct times. I haven't used this software much before but that looks ok.

Regards the temperature issue, it looks like you get 280 degrees in 1st and 4th gear and -58 degrees in 2 or 3.

Depending on how the outputs are set up, it looks like the TCU is taking the voltage from a solenoid and using that as the fluid temp reading...

That is just a guess but if you look at your log file and select the two headings:

TCU Current gear (light blue)
TCU Fluid Temp 1 (different shade of light blue)

You can see that the temperature goes from high to low at the same time as the 1-2 change or the 3-4 change.

Solenoid A is high in first gear and then in 4th gear. So maybe the solenoid is triggering the temperature reading.

Somebody maybe messed up the internal wiring on the rebuild, unless there is a wiring snafu in the harness.

You can command the gear changes using the programme and if your coolant temp does it at the same time there's your answer...or at least pointing you to it.

I played the logfile and at the exact second your gears change, the temp changes. I think that is your problem.

Now you just need to work out where that is connected to and connect the temp sensor.

Let us know what you find, hope this was useful, but it is my first reall look at a log file so I suggest you get some other opinions before dropping the pan to do the wiring.

Can you get a new harness easily?

 

[Quickstop [UK]]

Re: 4l80e wiring?

OK - I did a little more investigation and I am convinced that I am right - your solenoid control output is being recorded as your temperature.

On the log, select the line for TCU Fluid Temp 1 and then select TCU.PWM 7 which is the Solenoid A line.

They are identical.

Et voila.

I looked at the configuration in the software and can't see a way to change that so I think it is in the wiring in the trans. Sorry dude.

Check the harness - if you get continuity between Solenoid A and the pin for the temp then that's your problem otherwise there must be a fault inside the trans.

 

[J-bird]

Re: 4l80e wiring?

Quickstop,


That dose help!!

After looking at the log a bit more the desired gear and the current gear look odd to me. I don't have the astg manual with me, but It looks like maybe I got the shift solinods hooked up backwards. I used and aftermarket solenoid pak, and the plugs were the same. They are also right next to each other on the valve body, so I may have dorked up on the wiring.

From the log can anyone tell if that looks plausible? And could that be causing problems with the temp sensor?


Thanks,

Jeremy