P0743/p0740 - JeepForum.com
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post #1 of 3 Old 06-23-2013, 02:25 PM Thread Starter
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2002 TJ Wrangler 
Join Date: Feb 2009
Location: Meridian
Posts: 20

Can anyone offer advice on what my problem might be? Two weeks ago I got the following codes:
P0743 Torque converter clutch solenoid circuit electrical
P0740 Torque converter lockup malfunction
P0443 Evaporative emission control system purge control valve

I took it to a transmission place, and they found it was not the solenoid, but as it was the original (2002 Sport) replaced it. That seems to have solved the P0740 problem. He said the 743 was solved too, due to a wire that was shorted out behind the fuse box (behind glove compartment). Well, the 743 came back. I did not ask him to deal with the 443 code.
Oh, and at the same time, the AC didn't work. He said the fix he did fixed the AC, too.
Took it back and he swapped around a couple of relays and found they were all "ok". Also, said that by doing so, it fixed it. He supposedly drove it around quite a bit and the code did not show and the AC was working.
Well, I picked it up and after 5 miles, the 743 code came back (as did the 443). And, they won't clear.
Anyone ever have this problem, or ideas before I take it to the dealer?

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post #2 of 3 Old 06-23-2013, 02:37 PM
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1983 CJ7 
Join Date: Mar 2013
Location: Peotone
Posts: 159
Take it to an automotive electrical shop. They can diagnose more than a dealer and you will not have to buy your Jeep twice. To me it sounds like an ECM issue but I cannot test circuits through the web LOL. Intermittent issues are many times from a cracked circuit board..... Jon
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post #3 of 3 Old 06-23-2013, 11:32 PM
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2005 LJ Wrangler 
Join Date: Mar 2011
Location: Trails of
Posts: 3,672
I don’t think that it is a coincidence that evap/purge solenoid, the torque convertor clutch solenoid & the a/c compressor clutch relay are all on the same fuse. That fuse is fuse 11 in the block behind the glove box. It could be there is a bad connection where the fuse plugs in or it could be a bad splice in the harness where the wires separate to got to each of the listed components. That splice is along the firewall more or less in the center near where the ground strap for the hood comes out of the harness. All the wires are red/light green. Since working near the fuse block made everything work temporarily, I would start there. Hope that helps.
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