I have wired up a few LED's already for things when are active. The only problem I am having is with the TCC.

I found the wire that goes to the ECM GF6 (Tan/Black) spliced into this wire connected it to the NEGATIVE side of the LED and ran 12v to the positive side of the LED.

But the problem is that the LED is on. The car is turned off but the LED is lit which would mean that the TCC is engaged but it should not be when car turned off?

I thought the the ECM grounds the wire in pin location GF6 to engage the TCC?

Can some offer any assitence how to wire up the LED to only light up when the Lock up convertor is engaged.

Thanks,
Mike

 

The wire you tapped into goes from pin "D" of the TCC connector on the tranny to pin "F6" (not GF6) of the ECM and pin "F" of the ALDL so you basically have it energized all the time.

 

Pin GF6 is the same as F6 I an pretty sure as nothing else it could be?

Trickster how would I then wire up this LED to only light up when the TCC is engaged? Is there a wire the ECM grounds to enage the TCC solenoid? Or does it do it another way?

 

The last post I came across about the TCC was Vader's. IN his description he said that the ECM controls the TCC solenoid by ground a wire on terminal B on the solenoid.

Now I had a look at the diagram below



Now it looks like I tapped into the wrong wire. I tapped into GF6 thinking that the ECM grounds this wire when to engage the Lock Up convertor.

Reading what Vader said it seems like that I should be tapping into the LIGHT BLUE wire that goes to B014 ( 4th gear switch signal).

Where do I find B014 as that is not a pinout on the ECM?

I want the LED to light up when the lock up convertor is engaged so I need to find the wire that the ECM grounds to enable the TCC solenoid?

Also I have heard that the lock up convertor locks up in as low as 2nd gear so having it wire tapped onto this 4th gear switch siganl WIRE will not tell me if the lock up convertor locks up in 2nd will it?

 

Just a quick question here, what year and model car are we looking at here? It would help me in looking at my schematics.

 

Trickster,

I have an 86 IROCZ converted to MAP using a 730 ECM.

Mike

 

Trickster any luck on looking at the schematic?

 

Hey Mike,

Yes I am making some progress here looking at the schematic and some other sources that I am getting together for you. I will have them on the board for you later today.

 

Sensational. While at work today during my break I was thining what else I could wire up.

I thought of a few circuits. Not sure if they are possible? What do you think?

WOT LED to light up when ECM goes into open loop. I am pretty sure I have mine set at stock values and that is at 80% throttle at higher RPM. Now I was thinking could I tap into the TPS wire volatge reference that goes into the ECM and get my power from this wire to run the LED??? I would have to use a resistor in the circuit as the LED's available here are 2.2v So if the TPS volatge at 80% is around 3.8v or there abouts I would use a resistor on the LED and make the LED light up only when the voltage is greater then 3.8v which would mean I am in OPEN loop.

Can I do this or will the extra circuit interfer with what the ECM sees from the TPS??? Any idea?

Also another indicator would be nice to have a LED light up when in closed loop. Now I am uncertain as how to do this one. I know the O2 sensor starts varying voltages at correct temperature but I think this would not be sufficent to run a LED as we are talking millivolts. Any suggestions on this one?

Thanks for your help. I have the interior of the car apart and want to do all this wiring in one hit and not have to add LED's later on and wiring etc..

Thanks,
Mike

 

Hello Mike,
While I haven't quite figured every thing out on your tcc l.e.d. I have found out that you need to remove that 12 volt wire. There is already 12 volts going to that wire when you turn the key to on. It grounds inside the ECM when the tcc engages.

 

What wire should I remove from the LED? I have only 2 connections to LED one is 12v from battery and the other was pin GF6 from ECM thinking this was the wire the ECM grounds to complete the circuit. That is the same wire that goes to pin F on the ALDL.

Not understanding what you mean.

 

When the TCC closes the switch at F6 on the ECM that does close the circuit. Give me a minute and I will post the picture of what I'm talking about.

 

Hmm okay I will wait for you. Do you know what that L.P connector is in between the TCC solenoid and the ECM in the diagram above. Maybe I need to tap into the wire after the LP connector.


I'll see what you come up with

 

Patience my boy, patience. Okay here are 3 items for you. The first one is a better picture of the one you have above. The second is some reading material explaining a little about the TCC function. The third is a chart shooting that switch to ground in the ECM that I was talking about. First, as I mentioned earlier, you don't need that 12 volt wire spliced in there since there is already 12 volts to it when you turn the key. To show what I mean, if you have one of those test lights. Turn the key to "ON" and put the probe in pin "F" of the ALDL and ground the other end. The light will come on, press the brake pedal and the light will go out. Take a look. BTW, I forgot to mention that wire you were talking about going to the instrument (I/P) panel is pin "H" of the 15 pin connector (C207) under the dash near the ECM.

 

page 2

 

page 3

 

I tested the circuit out again as I have it wired. Maybe this is how it is meant to be?? But it is weird.

With the key in off position the LED is lighted. When I turn the key to the on position Fuel pump prime etc... The LED goes out.

This has me thinking that the TCC solenoid is grounded by the ECM when the car is turned off. When I turn the key to ON the ECM must open the circuit and wait till criteria is met to ground the wire and enbale the lock convertor.

Could this be the case?

So unless I wire a switch to feed the LED panel I will have the TCC LED on all the time while the car is off.

Does this make sense?

 

Thanks for that trickster! But I think we are not talking about the same thing.

I don't want to wire up a manual switch to lock the convertor when I want to.

All I want to do is make a LED light up when the TCC solenoid is engaged.

I did not splice 12V into wire that goes into F6 of the ECM. I ran 12v from the battery straight to the LED through a resistor not to burn the LED as it runs off 2.2v normally.

Then I spliced into wire F6 to get ground. Thinking that when the ECM wants to operate the Solenoid it grounds that wire.

Are we talking about the same thing?

 

Argh looks like what I wanted to do can't be done. As the instructions you posted up say that even when the TCC driver is turned on by the ECM does not mean that the Torque Convertor is engaged.

There goes that idea.

I did the test you said and it works like you say. But the way I have wired up the LED, is that it lights up when the break pedal is pressed.

 

No, I guess we're not. I included that information so you would know how the TCC functions and would allow you to wire your L.E.D. up so it would operate in the fashion that you want. No mention was made of putting a switch anywhere that would allow you to manually lock up the TCC. Sorry!!!!!!!!!!!!!!

 

I thought that the circled area in your last picture was a switch. Sorry my mistake So If I connect the LED to that wire and ground the LED it should do the trick. I will give it a go.

I read the information and tested the TCC out and it does behave like written to that is cool.

I have to get one of those service manuals they look really good!

Have to start looking on Ebay

Thanks for your help Trickster! BTW I am still waiting on those belts to arrive from the USA. Remember you told me how to put them without removing the T-Top liner. They should be here soon.

 

Cool, BTW those are switches in the circled area. However they are factory mounted inside the ECM. Yes, these service manuals are nice.

 

Okay Basically all I did was spliced into the TAN/BLK wire F6 on the ECM. Connected that to one LEG of the LED and the other LEG of the LED I connected it to ground.

I have not tested the car out yet to see what this set-up gives me but it might work.

Now with the KEY ON it lights the LED. If I press the brake pedal the LED will turn off.

Now this got me thinking I am kind of confused a little. Now if the LED is on this means that the TCC solenoid is not engaged going by what you posted.

Now if I tap the bake pedal does this mean that the circuit gets interupted?

So now if I take the car for a drive and the LED goes out this should mean that the TCC solenoid is engaged.

 

Trickster,

Thought I would let you know that I took the car out today for a test drive and check out this LED for the TCC.

It works fine

I only took the car out for a 15 min drive to see if it was working. I did not have enough time to test all driving conditons but the LED was operating with the TCC. I could feel the TC lock up and the LED blacked out.

Now some have said that the lock up convertor will lock even as low as 2nd gear. Now from the driving I did today it did not lock in 2nd at all. It might have locked in 3rd gear but I had to brake before I was 100% sure.

It did lock in 4th gear though.

Thanks for taking the time to help me out!!!

PS. You would not happen to have one of those service manuals for sale for a 1986 Camaro IROCZ? If I was to get a 1989 for example they woudl be pretty much the same or not??

 

The manuals are pretty much standard although there a few variations in some areas. I saw a manual for the 86 on e-bay the other day for like about $10.00 plus shipping in the U.S.

 

Damn! What is the exact name of the manual is it just called a GM service parts manual?

Cause there a few manuals floating around and I want to to get the one the GM techs used.

 

Search for GM service manuals, currently as of two minutes ago there are none listed. Just keep checking ebay for them every so often.