Hey guys, I have a f150 2002 with a 5.4 and 4r100 (yes im sure), and a week ago my torque converter started getting stock (locked) when i came to a stop making the engine stall (it took a couple of minutes before my engine got warmed up). I checked the codes and got 0740 and 0743 which relate to the tcc solenoid malfunctioning. To make sure the tc wasn't physically stuck y cut the purple wire that signals the solenoid to lock the converter, the truck ran fine and as expected the tcc never locked, so I thought I norrowed it down to the solenoid pack, which i bought (300 bucks ouch) and changed it yesterday. Today again the same thing started happening and the truck is throwing me the same codes, so im a bit frustrated. I don't wanna go ahead and buy a torque converter without knowing the real cause, any ideas of what could it be? I didnt see any melted wires down there but could my long tubes be shorting that wire out randomly in an unseen place? or could my tc be bad?

Thanx in advance

 

If the torque converter were bad cutting the wire wouldn't make any difference. Since cutting the wire solved the problem the problem is in the wire or the PCM. If it is the wire the problem is located between the PCM and where you cut the wire.

 

Yep I needed confirmation, thats what i thought, Im gonna retrace the wire back to the pcm, if the wire is good then the pcm i failing i guess, and i will try a mod a read a while back of manually locking the tc with a switch, Ill post my results

thanx

 

How are you tracing the wire? Visually or with a meter?

 

Visually, I was gonna ask, the wire goes directly to the pcm, and its purple there too? that way i could check through a meter..

 

Checking the wires visually is useless. You're just wasting your time. Get a wiring diagram and a meter and check it the right way.

 

you re right, do you know where can i get a diagram?

 

www.atsg.com or Service Manuals, Owner Manuals, Wiring Diagrams, Service Bulletins - Helm Incorporated

 

Thanks Mark, youve been a great help

 

Will this work?

http://atsg.com/cart/products/4R100-156-0.html

 

I have never had one of those manuals, but the description looks like it will have what you need.