4t60e wiring confusion...

[KlingonFiero]

Thanks!

I am getting ready to take it on a 30 mile drive in an hour or two... I am finally going to take a Fiero to the Fiero Club Meeting!!!

I hope that the TCC locks up appropriately...

I will let you all know.

[CNCguy]

Congrats Don... glad it is working out. You are passing me up now since I haven't had any time to tune on mine and it is getting cold out. Good work.

[KlingonFiero]

FINALLY! She is on the Road!!!

Well, just a few months overdue But, it is on the road and driving very well...

I ended up putting the "ignition" wire for the 7-pin to constant ground instead of hooking it up to a 12v source... This seems to be working very well...

I drove it quite a bit and she seems to be shifting perfectly!

I did use a relay to power the Reverse lights. I think it was very much needed in the Fiero - ever try to back up without any lights in a Fiero??? it's bad enough WITH the lights...

Thanks to everyone for the help!

Very much appreciated!

-Don

[CNCguy]

Good to hear you are moving along. My ECM is looking for a ground as well so I grounded the common side of the switch. I do not have reverse lights but would use a relay as you said. Not only would it use the least amount of relays, it would also make it more reliable. I would prefer losing my reverse lights over transmission operation in the event of a relay failure.

[KlingonFiero]

Getting close to being done with the wiring... The person I had helping me, did a beautiful job of matching up the wires by color. Unfortunately, this is a complete Frankenstein of a car and the wire colors do not truly mean anything...

And, I cannot believe I missed this:

The "Transaxle Range Switch" is putting out a 12v signal!!! The ECM I am using is looking for a Ground signal for the 1st and 4th gear signal

I hope I didn't fry the ECM...

CNCGuy: I presume your ECM is looking for a 12v signal? or did you use a relay? or ???

I am thinking about wiring the switch to ground, and then using a relay to reverse the signal to a 12v for the reverse lights.
That way I only have one extra relay, instead of two... I will be working that little issue out tonight...

Thanks for everyone's help! Couldn't have done this without without you guys!

[KlingonFiero]

Well, It will be a few more days before I can let you all know about how the transmission works...

I have a lot of wires hooked up wrong/poorly.

So, I pulled out the whole harness and will start redoing it tomorrow evening.

With a little luck I should get it done by wednesday or thursday...

[KlingonFiero]

Glad to hear it is all working though!

Thanks!!!

Those would have been helpful yesterday morning...

I am heading out to the garage now - it is raining pretty hard this morning, hopefully by the time i button everything up, the rain will have stopped. I will be back with results of driving her as soon as I can!

[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!

[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...

[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

[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.

[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.

[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.

[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]

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!!!