4x4 Not Working - Ford Powerstroke Diesel Forum
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Old 09-07-2007, 10:35 AM
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Gentlemen:

New to this, and I know you guys can help me with my problem.

I have a 2002 F250 4x4 7.3L PSD. The other day, I got stuck and 4x4 would not work! Dadgome, I had to be pulled out by a Dodge! Anyway, here is the technical stuff so that if you know you might be able to help:

When I turn the ESOF (electronic 4x4 switch) nothing happens. No clicking, nothing. No noise from the shifter, nothing. There is no noise of something coming on. The 4x4 lights do NOT come on the instrument cluster. When I first turn on the truck, the 4x4 cluster comes on for a second, but that is it.

I checked the selenoid and the vacuum lines and I have vacuum. I turn on the heater, I can switch from defrost, to floor, to air vents, and back. Hubs are brand new, since I replaced the complete hub assemby because of the bearings three months ago. Ford dealer told me without checking that the hub seals for the vacuum were bad. Didn't want to have to tell him that his shop changed the WHOLE hub assembly 3 months ago with FORD parts.

I checked the relays and the fuses. They were ok. Took vehicle into my mechanic and there is fire at the fuse panel (#111). We checked the switch and completely took apart the switch and the leads that switch the 4H and 4L there is NO fire. It appears there is no fire at the switch, Before anything else, you must know the little indicator light in the switch is on.

A tech told my mechanic that there is an ECM electronic control module or multi-function switch?

I have followed the manual and have been using my 4x4 so i know its not the procedure. I manual locked the hubs and nothing happens, no 4x4. Figured since I cant switch at the transfer case.

What do you think?
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Old 09-07-2007, 10:47 AM
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