I have been talking to some mebers here and researching a lot through the forums about 4x4 control modules. Several people have had trouble and there troubles sould like mine. Therefore I would like to know what the control module is and where it can be found (on my truck) to test it. Any imput is helpfull, Thanks.

 

Can anyone help? I just need to know where it is so I can try to test and hopefully fix my problem. Thanks

 

Are you looking for the shift motor?

 

The 2002 4WD Control Module is under the PS kick panel. The most common failures are in the shift motor/encoder assembly down on the transfer case.

 

I have checked the shift motor and it is working properly so I have heard others talk about the control module so I thought I would look into it. Thanks for your help.

 

and its part number should be something like 1L54-7H417-AC, Motorola model # 01MP207C01.

Yours could also use other dash numbers, they may list -AD and -AE as suitable alternates.

FWIW, my buddy just fixed his 02 with a salvage yard 4x4 Module ($50). His did NOTHING, no clicks, no lights at key on, NOTHING.

His conversation with the salvage yard guy centered on, "Did you recently have a battery problem and jump start your truck a few times?" The replay was yes, dead battery. Parts guy says LOT'S of these fry when people have a battery problem. This includes Explorers, as they share this part, depending on model year.

The other issue he discovered was that with the shift motor removed he could not manually switch his T-case into 4hi. It would go in, but spring back to 2hi. Wouldn't stay in a detent for 4hi like it did in 4 Lo. He didn't figure that one out, but replaced the module and his works good now.

 

They are controlled by a microprocessor, but switch moderately heavy currents and have good sized wires going to them. It conceivable that a surge or whatever could fry them.

I'm going to design a hybrid auto/manual controller that will let you control the motor manually if necessary, but still allow on-the-fly shifting. I know enough about t-case operation now after reading on and dissecting the ones I got for the SAS/4x4 conversion of my 4x2 that I feel I can do that.

I've been threatening to do it for awhile, lol, and CrazzyEarl for one is interested in what I come up with. But the fan controllers and the new digital design for one are taking up my time so I haven't worked out the final t-case control design.

 

I can get you a donor carcass (4x4 Shift Module) from an 02 Edge.

Figure it might aid your project, having connectors, space inside for relays, circuit board, etc.

Let me know if you want it (by PM).