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post #1 of 25 (permalink) Old 07-22-2008, 06:20 PM Thread Starter
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P0743?

So yesterday during some substantial rain my car started acting up. Had a buddy check my CEL and pulled a P0743 code for a Tourque Converter Clutch (TCC) electrical system malfunction and I don't know what im looking for. Anyone ever experience anything of this nature. The car is having some seriously hard shifts on the upshift and downshift. Any troubleshooting tips would be much appreciated.

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post #2 of 25 (permalink) Old 07-27-2008, 03:29 PM Thread Starter
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Does anyone have any ideas on where to start looking first before I remove the trans pan?

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post #3 of 25 (permalink) Old 07-27-2008, 04:24 PM
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Before pulling the pan I would carefully check the wiring harness that goes to the transmission. Make sure the connections are clean and undamaged. Since it rained and then acted up, be especially sure that all the connections are sealed.

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post #4 of 25 (permalink) Old 07-27-2008, 10:20 PM Thread Starter
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I have disconnected the harness and used an entire bottle of electronics parts cleaner and plugged it back together, i have reset the computer (unhooked battery), and the problem still occurs. There is a solenoid for the TCC but i am unsure of where exactly it is located and I was told that this also could be the culprit, is this true and where might it be? As far as replacing the TCC, has anyone ever done this and is this a fairly easy fix?

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post #5 of 25 (permalink) Old 07-27-2008, 11:18 PM
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Quote:
Originally Posted by mackenziet View Post
I have disconnected the harness and used an entire bottle of electronics parts cleaner and plugged it back together, i have reset the computer (unhooked battery), and the problem still occurs. There is a solenoid for the TCC but i am unsure of where exactly it is located and I was told that this also could be the culprit, is this true and where might it be? As far as replacing the TCC, has anyone ever done this and is this a fairly easy fix?
It's easy to replace. You have to drop the pan, remove the filter, and there is one bolt holding the TCC solenoid bracket on. Remove it, disconnect the electrical connector, and reverse the process.

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post #6 of 25 (permalink) Old 07-28-2008, 06:55 PM Thread Starter
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Good to know, but is the TCC or the solenoid and common failure?

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post #7 of 25 (permalink) Old 07-28-2008, 07:06 PM
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No, it's not common for the solenoid to fail. The actual friction material of the TC clutch is known for failing and when this happens, you get the "shudder".

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post #8 of 25 (permalink) Old 08-17-2008, 04:01 PM Thread Starter
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How exactly do I diagnose if the TCC is bad? I am having no luck in solving this problem.

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post #9 of 25 (permalink) Old 08-17-2008, 05:38 PM
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About the only thing you can do without one of the diagnostic machines the shops has is to check the wiring and measure the resistance of the solenoid. It should be between 1 and 3 ohms. If it is out of spec, it needs to be replaced.

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post #10 of 25 (permalink) Old 08-25-2008, 01:53 PM Thread Starter
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Pictures Please!!!!!!

I have the pan dropped, and the valve body dropped but my manual is very weak and does not show any pictures of what im looking for. I am specifically looking for the solenoid for the TCC and im looking for the TCC itself. This is on a 1995 Thunderbird V8. Again i am having trouble with hard but sloppy shifts and I pulled a code for the Torque Converter Clutch Electrical System malfunction. I have very briefly checked all the conections on the harness and found no apparent flaws or problems, so i decieded to dive in a little deeper. I need to know where to start looking and what to start trying to replace without turning this repair into a small fortune. I will be posting picture of where im at in the process and if you could sokindly point me in the right direction of this repair. Thanks for all you help in advance guys, i need to get this car running right again and soon. So if any of you out there have pictures of either replaceing these things or just pictures of where the are loacted that would make it much easier for myself.

Tim













IS THIS A PROBLEM!?!?!?!?!?!?!?!



SAME PICTURE DIFFERENT VIEW, ANYONE SEE A PROBLEM HERE!?!?!?!?!



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Last edited by mackenziet; 08-25-2008 at 04:28 PM.
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post #11 of 25 (permalink) Old 08-25-2008, 04:30 PM
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Why did you drop the valve body? That was completely unnecessary for replacing the TCC. Looking at what I said above, I never mentioned removing the valve body, so I hope you are j-modding or replacing the 2-3 accumulator or you just did that for nothing.

This is the TCC solenoid:

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post #12 of 25 (permalink) Old 08-25-2008, 04:39 PM Thread Starter
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Solenoid Tested good, so where is the TCC?

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post #13 of 25 (permalink) Old 08-25-2008, 04:40 PM Thread Starter
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Also I would like to J-mod it but i do not trust myself doing it, and now that i droped the valve body do i absolutely need to replace the 2-3 accumulators?

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post #14 of 25 (permalink) Old 08-25-2008, 04:43 PM Thread Starter
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Anyone in my area, would you like to come over and assist in doing a j-mod as I have never done it before? Your services will be rewarded!!!

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post #15 of 25 (permalink) Old 08-25-2008, 04:59 PM
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Quote:
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Solenoid Tested good, so where is the TCC?
What I circled IS the TCC. If the resistance checks out ok, it might still be bad, but carefully check all the wiring both inside the transmission and out. You might need to tear the external harness that goes around the transmission apart and check for problems.

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post #16 of 25 (permalink) Old 08-25-2008, 04:59 PM
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Quote:
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Also I would like to J-mod it but i do not trust myself doing it, and now that i droped the valve body do i absolutely need to replace the 2-3 accumulators?
If it's the original one, yes you NEED to.

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post #17 of 25 (permalink) Old 08-25-2008, 05:49 PM Thread Starter
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So replace the TCC AND solenoid and replace the 2-3 accumulators as well as the tranny fluid w/ Mercon V and a new filter?

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post #18 of 25 (permalink) Old 08-25-2008, 05:50 PM Thread Starter
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Anyone Up For Assisiting In A J-mod While Im Here????
Also my gasket for the valve body seems to be screwed up, can you buy these seperate?

This is the gasket you do the j-mod to correct?

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post #19 of 25 (permalink) Old 08-25-2008, 05:54 PM
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So replace the TCC AND solenoid and replace the 2-3 accumulators as well as the tranny fluid w/ Mercon V and a new filter?
Replace it if you can't find anything else wrong. Replace the 1-2 and 2-3 accumulators if they are the original design. Use the appropriate springs in the 1-2 and none in the 2-3. And j-mod the valve body. And install a tranny cooler.

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post #20 of 25 (permalink) Old 08-25-2008, 06:00 PM Thread Starter
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how much do you figure this all will cost? also the tranny cooler might be out of the question as i know i won't have $$$$ for that. And whats with the no springs in the 2-3 accumulator? And when you say j-mod the valve body thats not just the gasket it also is the valve body itself correct? Sorry but tranny's are not my area of expertise.

Tim

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post #21 of 25 (permalink) Old 08-25-2008, 06:37 PM
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To do the j-mod completely (without a tranny cooler), plan to spend about $150. That includes all the parts and the cost of fluid. It seems like a lot but the trans will thank you. A cooler would add about $50-$60 to that.

However, I see that you are selling the car in your sig. Why invest anything into it? Just fix the TCC solenoid issue and call it a day.

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post #22 of 25 (permalink) Old 08-26-2008, 05:41 PM Thread Starter
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Ordered the parts today . . . . .

Pan gasket and trans filter kit $19.49
TCC aka shift solenoid $40.22
1-2 Accumulator $20.44
Spring for 1-2 Accumulator $14.95
2-3 Accumulator $14.48
Valve Body Gasket $16.50

With tax totaling $133.65, now i would like to drain the TC itself is this possible while still installed in the car and how do I refill it? Also if I replace all these things and DO NOT j-mod is there going to be problems? Does the 2-3 accumulator already have a spring in it and why do you replace it without the spring? Again thanks for all the help so far Chris

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post #23 of 25 (permalink) Old 08-26-2008, 07:51 PM
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Um, the TCC is not the shift solenoid. The TCC solenoid is the torque converter clutch solenoid. I hope you got the right one. If you look at the picture above where I circled the TCC solenoid, you can see the shift solenoids right next to it. There are two solenoids as a single assembly, and they are the white squares with black circles in the center.

If you do a complete drain, you refill it by putting about 5-6 quarts in and then you crank the motor to get the fluid pumping throughout the transmission. The pump is what refills the torque converter.

If you don't j-mod, the transmission won't fall apart. It's just not going to last as long and won't have the quick, crisp shifts that prevent burning up the clutches.

The 2-3 should have a spring from the factory. You don't need to put it back in because the spring softens the shift too much, causing way too much slippage, heat, and wear. The 2-3 shift will not be that harsh without a spring. The 1-2 is a different story if you leave the springs out of the 1-2 accumulator.

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post #24 of 25 (permalink) Old 08-28-2008, 08:08 PM
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hey I got a question hole #5 says to use a 99 main control unit otherwise drill the hole does the main control unit need to be changed if we drill the hole?
http://www.tccoa.com/articles/tranny...ission/d95.jpg

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post #25 of 25 (permalink) Old 08-29-2008, 08:11 PM Thread Starter
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