Torque Converter Clutch Solenoid where in the hell is it? - JeepForum.com

 
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post #1 of 11 Old 02-26-2011, 06:14 PM Thread Starter
gstensler
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Torque Converter Clutch Solenoid where in the hell is it?

I have an 02 TJ and the TCCS appears to be bad. It only has 62000+- miles. It drives fine but I have noticed a drop in gas milage, to be expected.

I took it to a local shop to be diagnosed and was told it was the mechanical portion of the TCCS itself, from what he could tell. So as we all do I started looking into if I can do it. After doing what I could, as far as research, I can not even find a place (web site, books, ect) that can show me how to access it.

So can anyone tell me? Is it in the tranny itself, on the outside or just flat out hidden. As you can tell I'm not a tranny guru. Should I even attempt this task or just man up and take it in.

My next question is, is there a better one (performance) that I should replace this with.

It is my daily driver but anything to better my jeep would be worth it to me.

Please help if you can

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post #2 of 11 Old 02-27-2011, 03:33 AM
ratmonkey
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The tcc solenoid is on the side of the valve body in the trans.

What was the exact code pulled...not really a code in the system that will tell you there's a "mechanical" problem with the solenoid. There are a few other parameters that can prevent lock up.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #3 of 11 Old 02-27-2011, 11:08 AM Thread Starter
gstensler
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The code that shows is the PO740. The shop told me that they ran several different test and that would be there guess without dropping the tranny to look inside.

I have tried several things that other people have mentioned; checked the wire connection at the tranny and even replaced the wire connection. Checked the tranny fluid level, was told if it is over filled that could cause this code.

About the time this happened I had replaced an aux tranny cooler, because of a leak. I have asked before if this could have anything to do with it and nobody seems to think so. What is your thought?

If you have anyother thoughts please shoot them my way as I am open to anything at this point.
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post #4 of 11 Old 02-27-2011, 11:12 AM
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The solenoid itself is here, on the valve body inside the pan...


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post #5 of 11 Old 02-27-2011, 04:11 PM
ratmonkey
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All that code tells you is that the clutch did not engage properly.

there are codes specifically for the solenoid failing, that its not one of them.

Check your brake switch and throttle position sensor. Verify fluid level as well.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #6 of 11 Old 02-27-2011, 04:46 PM
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Quote:
Originally Posted by ratmonkey View Post
All that code tells you is that the clutch did not engage properly.

there are codes specifically for the solenoid failing, that its not one of them.
I believe P0743 is the code for loss of 12 vdc to the PCM from the torque converter lockup solenoid...
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post #7 of 11 Old 02-28-2011, 11:45 PM Thread Starter
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What would the brake switch have to do with it?
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post #8 of 11 Old 03-01-2011, 12:28 AM
bruteboy
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Quote:
Originally Posted by gstensler View Post
What would the brake switch have to do with it?
in some vehicles,when the pcm receives a signal from the brake switch(brakes applied)the pcm will disengage the torque converter clutch to prevent the engine from stalling.
if the brake switch is faulty or missadjusted,it may keep the tcc from engaging.
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post #9 of 11 Old 03-02-2011, 02:03 PM Thread Starter
gstensler
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Got it. Thanks for the info. That will be the next thing to check.
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post #10 of 11 Old 06-29-2011, 04:33 PM
indytrucks
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I know this is an old thread but, would the brake switch keep the torque convertor from unlocking and or engaging too early?
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post #11 of 11 Old 02-21-2016, 06:52 AM
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Only 4 1/2 year old thread....

I'm having a problem with my '97 TJ 4-banger that seems related to the torque converter. Basically the clutch won't engage at stop, when the engine is warm (seems to work normally when run while the engine is cold). Of course this means every time I come to a stop light, the engine freaks out and stalls. I have to throw it in neutral when coming to a stop. Sometimes when I put it back in drive to go, it stalls out again unless I give it a little gas at the same time.

I know nothing about auto transmissions (except how to check the fluid). The fluid level is good and it's clean. The tranny was rebuilt about 18 months ago. I've looked at the brake switch. It seems fine (it's moving normally), but I have no idea how to remove it. It did throw a code a couple of months ago - P0740 or P0743 or something like that. Checked fluid, cleared the code, and it has not come back. I took a look at the solenoid wires. They're attached, is all I can tell. It looks like they're just stuck in there - not sure how to pull or re-attach. Maybe I should check for signal on them, but I don't know what to look for ...

2001 TJ Sport 4.0L w/D44 rear
RE 2" BB rear, OME 2 1/2 over springs front, OME shocks, JKS 1.25" Bodylift, JKS 1" MML, 33x12.5 BFG MT
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