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Old 01-12-2014, 05:09 PM
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4x4 inop

I need some help, my 4 wheel drive stopped working about a year ago. I have a 2006 F350. To give a little history, I took it to my local dealer for a diag, they told me it was the 4x4 mod so i replaced it. That didn't fix the problem so I took it back and let them have it all day. They then told me the mod was fine and it was the encoder motor, I replaced it with two other ones and still nothing. I'm a diesel tech on heavy equipment and worked for a GM dealership so I do have some back ground. I found a diag sheet for the code that they pulled and ran it. I replaced the PVH selinoid and still nothing, the fuses are good, the relays click with the key on/not running when the dash switch is turned to 4 high and 4 low. I know that I can override the ESOF by turning the hubs from auto to
lock. It seems as if I'm not getting power to the encoder motor and not sure where to start looking. I was dissatisfied with the dealership and wrote a letter to Ford Corporate and now I get the runaround so I will not be going back for further diag. I do not have the program or laptop to pull or clear codes stored in the GEM, any help would be greatly appreciated
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Old 01-12-2014, 05:15 PM
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here is the shop manual for the ESOF
might help a little, and just because the relays click doesnt mean they are making contact on the other end.
Attached Files
File Type: pdf ESOF.pdf (753.4 KB, 38 views)
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Old 01-12-2014, 06:12 PM
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Thanks, I'll go through it again and see what I can come up with.
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Old 01-12-2014, 09:53 PM
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ill share my previous experience with this. I had an 08 awhile back the 4x4 wouldn't work unless hubs were manually locked. ended up being something like the vacuum actuator or something related to the vacuum that controls the auto hubs. now my 06 is doing the same thing so im betting it has the same problem my 08 did. hope this helps
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Old 01-14-2014, 10:18 AM
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Thanks for the input, I have no vacuum leaks, I'm just not getting an input signal to the motor to shift the tcase
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Old 01-14-2014, 10:40 AM
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Since you dont think its vacuum related, here is a simple check of the relays to rule them out:

FYI to anyone with a 4wd
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Old 04-16-2014, 08:37 AM
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Any luck with this? I am experiencing the same issue, replaced relays, checked motor, replaced transfer case shift module, no vac leaks..... still won't switch....
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Old 04-16-2014, 04:44 PM
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I ended up replacing Pulse Vacuum Hub solenoid and after about a month I swapped relays with another truck and it started working. I also made sure that the wire connector for relays was tight inside the relay housing. Good luck
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Old 04-18-2014, 05:32 AM
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Good for finding it. Relays that click, don't always work as you found out, since the contacts can be the problem. I replaced my PVH solenoid last month to fix an intermittent to completely not working hub lock scenario. One side was not clicking. It has been working perfectly since.
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