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Old 04-09-2012, 07:16 PM   #1
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Code P0743 (@autozone )

Hi all-
Check engine light came on today so I stopped by autozone and had them hook up their diagnostic tool to our jeep. It showed the P0743 code with the definition:
--------
Torque Converter clutch solenoid circuit condition.
Explanation: PCM detected an open or short condition on the solenoid circuit.
Probable cause
1.Open or shorted solenoid
2. Electrical problem
-------
This is what was on their printout. They tried to look up the part and couldn't find it, perhaps it is something that is only at a dealership. I have no idea about that or if it is the real definition. Any thoughts on where to start. When I got home I turned the key on/off and then to on and started it and the check engine light went away. I'm new to this stuff so I thought I would ask the experts on here. It's a 98 jeep 4.0 auto tranny wtih about 106k miles on it.

Thanks

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Old 04-09-2012, 08:37 PM   #2
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See of this helps. I did a search for the part and came up empty handed. May be a dealer part only idk.

http://engine-codes.com/p0743_jeep.html

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Old 04-10-2012, 08:27 PM   #3
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That's interesting. I drove to work today and the light didn't come on and it drove fine. seems strange.
Any thoughts?
Thanks
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Old 04-10-2012, 08:28 PM   #4
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gremlins......
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Old 04-10-2012, 08:45 PM   #5
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Quote:
Originally Posted by Zurn
gremlins......
Very well could be. They are some pesky little critters.
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Old 04-14-2012, 10:35 AM   #6
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Well I think I proved there are no gremlins here. Does anyone have any value added input?
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Old 04-14-2012, 12:55 PM   #7
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I can't say what the cause is but that circuit is what controls your automatic transmission's locking torque converter. Once your Jeep reaches cruising speed, the engine computer sends a ground connection to the torque converter's solenoid which energizes it to lock the torque converter so it doesn't slip while driving. When the torque converter isn't locked while at highway speeds, it slips which reduces your MPG and causes the transmission to run hotter.

Your transmission has 3-speeds. It shifts the first time into second gear, and next into 3rd. Then once you're cruising at a steady speed, the torque converter locks which drops your engine RPMs a tad further which feels like of like a 4th gear. Do you feel that final drop in engine RPMs as the torque converter locks?
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Old 04-14-2012, 02:24 PM   #8
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Exactly as Jerry says. If the code doesn't return it could well be a one time glitch & the solenoid failed to lock up the converter. Now it may be OK. If it continues you may need the solenoid replaced. You have to drop the trans pan & valve body to replace it. Be sure to check the wires under there first.
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Old 04-14-2012, 03:23 PM   #9
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Quote:
Originally Posted by RUBI 4 MY MRS
Exactly as Jerry says. If the code doesn't return it could well be a one time glitch & the solenoid failed to lock up the converter. Now it may be OK. If it continues you may need the solenoid replaced. You have to drop the trans pan & valve body to replace it. Be sure to check the wires under there first.
Thanks guys, I'll got check the wires now; I assume i'm looking for wear or a short?
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Old 04-15-2012, 11:34 AM   #10
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reel, go ahead and check, least you'll know if it's outside the trans.
But like said the solenoid sits inside the trans in the valve body. If the problem is with the valve or wiring inside, you won't find it.

I see you have 100000 + on the trans. When was the last time you had the fluid and filter changed out?

Could be something as simple as the solenoid is hanging up occasionally due to poor condition of the fluid. If it hangs up, the computer could be reading it as a short as the power to run it spikes. And the code pops up for a short.
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Old 04-15-2012, 08:09 PM   #11
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Quote:
Originally Posted by Shelby427 View Post
reel, go ahead and check, least you'll know if it's outside the trans.
But like said the solenoid sits inside the trans in the valve body. If the problem is with the valve or wiring inside, you won't find it.

I see you have 100000 + on the trans. When was the last time you had the fluid and filter changed out?

Could be something as simple as the solenoid is hanging up occasionally due to poor condition of the fluid. If it hangs up, the computer could be reading it as a short as the power to run it spikes. And the code pops up for a short.
i looked and it appears there are two spots where wires go into the tranny. One inlet has three esposed wires, not sure what they are for.
To answer your question about the tranny, I purchased it about a month ago, I haven't seen any records or reciepts that show the tranny fluid was changed. I found a receipts for a pinion seal replacement though.
I noticed on the pan though that a few bolts are different than the others and there is some leaking with orange sealant around the pan edge.
Do you you suggest I change it out?
I think I should change the oil as well in the engine.
Do these have tranny cooler lines?
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Old 04-16-2012, 03:54 PM   #12
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There are 2 wires for the control solenoid (TCC), red/light green & orange/light green. The rd/lg is the power wire that comes from the #11 fuse in the block behind the glove box. The other is from the PCM & controls when it is to lock up.

I would check these wires first before changing the fluid only because you may have to drop the pan to change the solenoid & then change the fluid.

There are cooler lines going to the bottom of the radiator.

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