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1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Torque Converter Circuit Electrical Problem code P0743

 
  #16  
Old 10-18-2009, 09:08 PM
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I experienced same problem with this. I had just gotten the Expy back from the shop after the 5.4 died after 141,000k miles. Had to replace with one that had 65,000 on it. When I pulled out from the shop I made it half a mile b4 I had to slow for traffic and the Expy just stalled out. The anger I had was bad. All I could think of was I picked the wrong shop. Well turns out those wires are so tight in there that they were also shorting out on something and the shop had to fix their mess up. Another two weeks without the Expy for them to figure out.

1999 Expedition EB 4X4
Black
17' inch Chrome
Cooper Discoverer ATR
Flowmaster 50 SUV
Spectre Intake
HID High/Low
 
  #17  
Old 10-19-2009, 04:00 PM
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I just replace my solenoid because of the same issue. It was a nasty job but it took care of the problem (stalling at stops and OD light blinking). I also traced the wire harness all the way up to the engine bay and that things is so close to the exhaust manifold that it was resting on it and the wire loom was melted through. I covered up the wires and tried to move the loom further away from the exhaust manifold. I just also changed the filter and refilled the tranny with about 5 quarts of Mercon V fluid that drained out when I dropped the pan.
 
  #18  
Old 10-19-2009, 11:04 PM
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The wiring for the transmission is so close to the exhaust manifold I would almost consider it a design defect. But it is worth checking first because if it melts though to the wire it will ground and disrupt your torque converter from functioning properly.
 
  #19  
Old 12-24-2009, 09:43 PM
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hello this thread helped me out alot just a tad bit to late, i recently installed a tcc solenoid, ignorance is expensive, i checked the wiring from my tranny to the fuze box and i could see where the heat from the exhaust has broken down the heat shield for the wiring so tomarrow during the day i will check the wires individually and look for exposed wiring. my question is where exactly did you use your testing light did you use the pins that connect in the side of the transmission? im not to familiar with ford transmissions. thanks fte Merry Christmas btw
 
  #20  
Old 12-25-2009, 01:35 AM
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i checked out the wiring by the exhaust pipe/headers the insulator was worn down the wires were intact i traced it back right above the front driveshaft BINGO! was his name OH! guess when it was in 4wheel drive it wore the plastic covering and stripped one of the wires down to just two copper wires, a lil cut, cut, strip strip and some electrical tape and so far so good. so another heads up would be check any parts of the wiring that has contact with moving parts. thanks alot for everything fte guys
 
  #21  
Old 10-17-2014, 05:55 PM
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johneb

i have a po743 code. where is the part located and how can i get a diagram to trace the circuit? i am assuming that you mean to visual inspect the wiring?
 
  #22  
Old 05-24-2018, 03:38 PM
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Thanks to this thread P0743 and P0161 solved.

I was getting codes P0743 P0161 before reading this thread. The wireing harness was touching the Exhaust header on the passenger side. Moved the wires and codes went away. Great spot to check first!
 
  #23  
Old 09-28-2018, 02:57 PM
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Transmission Shop on LI

I liked your post and I see you have a transmission shop on LI... I have a 2003 f150 4.2 L.. runs great but the CEL is on with codes PO750, PO755 and PO743..
I am located in Wantagh... where is your shop?

Thanks, John



Originally Posted by Ford554 View Post
The E40D & 4R100 have a shift control unit or solenoid pack...whatever you want to call it. It has all the solenoids together so you replace the whole pack. 4R70W & that style unit have individual solenoids.
To replace the pack you have to drop the trans pan. If you find a lot of metal fragments in the pan/on the magnet then don't even bother changing the solenoids...you have internal failure. A lot of times the solenoids will get clogged with metal & trip a code.

I have a transmission shop on Long Island...if you live anywhere close I could check it for you.
 
 
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