4t60e wiring confusion...

[KlingonFiero]

Hi All!

I am trying to figure out how to wire up the 7-pin plug on the 4T60e that I have.

The Trans is a 1994 from a 3800 ( trans code is 4BLW )

The Engine I am mating it too is a 3.1 from 1991 Lumina.

and to complicate matters, the ECM is from a 1993 Buick Regal (the only ECM I could find that would run a 3.1 MPFI and the 4T60e)

I have the schematic off of this website for the 7-pin plug for '94-'95 transmissions and I have the schematics off of gmtuners.com website for the ECM.

The wiring is fairly different.

4t60e info off of this website:

Pin A - 1-2 solenoid
Pin B - 2-3 solenoid
Pin C - TCC/PWM solenoid
Pin D - TCC solenoid
Pin E - to 12v
Pin F - Temp sensor
Pin G - Temp sensor

ECM info from gmtuners.com

Pin A - 12v via n.c. brake switch
Pin B - 4th gear switch
Pin C - 1st gear switch
Pin D - TCC Control
Pin E - 12v
pin F - Shift Solenoid A
Pin G - Shift Solenoid B

Is there any way to reconcile the differences, or did I just waste a couple of hundred dollars and the last month of my time?

This is all going into a Fiero.

I have (or will finish soon) re-wired the whole car. Wiring is not an issue for me, but I am not sure at all how to hook up the trans so it all works right...

Thanks in advance!!!
-Don

[bszopi]

http://60degreev6.com/Articles/Transmissions/4T60E/4t60e_wiring.gif

http://60degreev6.com/Articles/Transmissions/4T60E/4t60e_wiring_2.gif

See if those help any.

[KlingonFiero]

http://60degreev6.com/Articles/Trans...60e_wiring.gif

http://60degreev6.com/Articles/Transmissions/4T60E/4t60e_wiring_2.gif

See if those help any.

Thanks!

It looks like there is no way that the ECM I have will operate the Trans I have

I do have another trans, it is a 1991 from a Cadillac (with the 4.9). It is marked 1AMW and it has a FDR of 2.97.

Does anyone have a Pin-out for that trans?

Thanks,
Don

[bszopi]

What's the model number of the ECM?

[CNCguy]

I imagine that it's a 16149396 ECM. I am using the same basic setup but the trans is from a '95 3100 Lumina. I have not had it out on the road yet but am pretty sure that it is correct. You can get your 1st & 4th gear switch signals from the Park/Neutral switch. It's the large switch on the trans where the shift cable connects. I did not write down which pins to use but it was easy to figure out with a continuity meter. The switch has several switches in it including the P/N start switch, back-up light switch, 1st gear switch and 4th gear switch.

Going by the trans pinouts that you listed, you should be able to connect it like this.

[KlingonFiero]

I imagine that it's a 16149396 ECM.

Yes, that is the ECM I am using...

I imagine that it's a 16149396 ECM. I am using the same basic setup but the trans is from a '95 3100 Lumina. I have not had it out on the road yet but am pretty sure that it is correct. You can get your 1st & 4th gear switch signals from the Park/Neutral switch. It's the large switch on the trans where the shift cable connects. I did not write down which pins to use but it was easy to figure out with a continuity meter. The switch has several switches in it including the P/N start switch, back-up light switch, 1st gear switch and 4th gear switch.

Going by the trans pinouts that you listed, you should be able to connect it like this.

I cannot believe I overlooked something so simple!!!

Your table looks right to me, except that the trans has a Pin "C" for a "PWM" solenoid. Can this really be ignored? What is the PWM solenoid do???

I will have to get it hooked up and get the last couple of things done and get her on the road...

If you get yours running first, please let me know how it works out, I will do the same!

[bszopi]

The PWM solenoid is really just there to make the transmission shift smoother. Its one of those "creature comfort" things. So yes, it should be able to be ignored without any issue.

[KlingonFiero]

The PWM solenoid is really just there to make the transmission shift smoother. Its one of those "creature comfort" things. So yes, it should be able to be ignored without any issue.

That is great! and coincides with the info I have found online...

Only thing I have been unable to figure out for sure is how the PWM actually works, whether it is n.o. or n.c. (hydraulically speaking...)
Need to know so I can truly leave the PWM wire alone or if it needs to be put to ground full time...

Thanks!!!

[CNCguy]

Nice table Brad... you must be bored. Thanks

I don't remember where it was at but I read that the PWM can be left unhooked and all works well. If someone knows otherwise, please jump in.

Edit: I got the info from a paper labeled "LT1 PCM to 4t60E". It says that it can be hooked up via a relay if you wanted to use it although it isn't necessary. When reading the note, I get the impression that energizing the solenoid causes the TCC to slip.

[KlingonFiero]

Sounds good to me...

I will try it and see how it works...

I have real high hopes to get her on the pavement again by this weekend.

[3100 MPFI]

From what I have seen when I was looking at trannies, there are 3 different ones, and they are NOT interchageable. There is a BUICK version (3800), and CADILLAC version (4.9) and a CHEVY version (3.1)

Something about the QDM's in the ECM would not work the 3 different trannies. Not sure if there is a way around it, but from what I was reading, using the 4.9 tranny on your 3.1 will not work unless you find a way to run your 3.1 with the 4.9 PCM.

[CNCguy]

KlingonFiero... did you get this going yet? I took mine out for a couple of short rides on Sunday and the shifting worked good. Just curious how yours worked out with the 3800 tranny.

[KlingonFiero]

That is extremely good news. I am glad you got it running

I have had quite a few delays, including having to pull about 90% of the entire wiring harness, yet again

And, I am still waiting on my Driver's side axle to get here - hopefully it will be delivered today...

I did get the engine running day before yesterday. Only for a couple of seconds though, no coolant - no trans fluid - no serpentine belt yet either.

I have extremely high hopes that I will have the Fiero on the ground by Saturday evening and actually drive it on Sunday...

I haven't forgotten about this thread, just nothing to update yet.

-Don

[KlingonFiero]

So close I can smell it! Of course, that could just be the spilled coolant I am smelling

I finally have all of the wiring sorted out, the custom axle completed and installed, and am currently working on the coolant fill...

I did have a couple of bugs to work out with the trans wiring. The P/N switch I picked up (no idea what year/make/model) has 2 plugs; 4 wires on one plug and 5 wires on the other...

The 5 wire plug was easy - it has the actual ECM p/n switch circuit, the reverse light circuit, and the Starter p/n circuit. (and a wire that goes to ground)

The 4-wire was a bit tricky to get to work right, it seems that it is a multi-pole/multi-throw switch setup. Took me about 15 minutes with a dvom and my wife in the car shifting through all the gears for me, to figure out what would work and what wouldn't.

Based on the schematic I am using (from this very helpful website ), The trans was looking for a ground only in certain gear selection.
Finally got it all figured out...

I have a few loose ends to tie up and am extremely hopeful that I will actually get the car to move under it's own power tomorrow afternoon at the latest...

Kinda depends on if it is snowing too much - I accidentally removed my windshield and the mobile installer can't get her till monday or tuesday

I will be back...

[bszopi]

Hmm... I thought I had these up on the site already, but I guess not. Well, they are now. You can verify your wiring with the following diagrams:





Glad to hear it is all working though!