I'll go check this right now. Thank you for the advice!

 

Okay, so both high and low works when the the hubs are locked, but not free. I tested it on the ice to confirm.

 

Look for a vacuum leak.

 

Mine was the same way, this was the problem: More Information for DORMAN 600402

Like I said, it took about 2 minutes to replace. This is the valve that directs the vacuum to the hubs to lock them in; mine was working intermittently.

 

If the PVH solenoid fails (leaks), the dash controls for the ESOF system will appear to be normal, but the hubs will never lock automatically. You'd have to manually lock the hubs to have 4X4.

Make certain that the symptoms are correctly identified, ie:

"Dash controls - No response no lights"
"Dash controls appear to work but no engagement"
etc

 

I was following this thread cause I get no response at the dial ( no lights or clunk for low) HOWEVER the posters question did not state the true problem ( from the sound of things he had lights on the dash but no action with the traction) SO I"MM TAKING OVER


My plan when I got the time & it's above 28 DEG's was to test for power at the shift motor plug BUT I like the idea of looking at a fuse 1st . Anyone know which ones to look at ...Thanks

 

One Vet to another my vacuum lines were both rotten and cracked thru right at the hubs. Even after trimming and resetting them they still leaked. This winter I lock hubs manually when I think I might need 4x4 like pending snow. I never had the problem with default to defrost or anything else just no 4x4 or inconsistent engaging of 4x4.

Even then I found the wire harness behind the switch would fall out even when latched. After 3 fails I just glued it in. I figure I can always cut another out next trip to the wrecking yard.

Best thing to do is check all of the vacuum lines, the wires behind and the hubs when you can. Again one Vet to another until the VA agrees to replace my hip this becomes a summer project so I manually lock hubs. Still the best truck/ car I have ever owned.

Thanks for your service and best of luck. Consider posting region you live in as many of us will jump in and help out when we can, but that only works if we know we are close by.

 

Thank you.

 

Just as an update, in case someone else runs into it, it was simply the aftermarket hubs that the last owner put on. They don't work with the vacuum lines, thus rendering the interior switch pointless. The mechanic I saw stated that the hubs were superior to OEM, so if I didn't mind manually locking, I should keep them.

 

Thanks for coming back and providing some feedback on your solution to the issue. And also of course, Thank you for your service!
That interior dash switch is still pretty important, it is needed to control your transfer case to shift from 2WD to 4WD or LOW range, it just no longer controls the front locking hubs.

 

Any way to covert abs to just rear wheels. I would love to be able to grease my hubs up front

 

Other than having the capability to use the grease fitting, why?

 

I have never really liked abs and my abs up front is already messed up. So i have to already buy a new sensor or if i could just delete the front ones and have the back ones i would rather have that.

 

The ABS hole grease fitting is only meant to be used WHILE ACTUALLY GREASING THE FRONT HUBS and then it gets removed and the ABS sensors get put back in. I don't know if you will find any aftermarket help in defeating the factory ABS system.
Does your EX just need a new sensor to be back to properly functioning? Pretty simple fix really.

 

Ya i am sure thats all it needs. I just saw on there site it was ment for rear abs systems and i figured that must be a thing. I got a price for it and its like 50 some