4wd Issue
Thread Starter
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Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
4wd Issue
Yesterday I thought I would play around on a 5' high dirt pile with my FX4. I put in 4Hi pulled up to the pile and pulled up about 2' and the rear tires started spinning. It didn't seem like the front tires were spinning at all. So I backed off and sure enough they were not. So I put it in 4Lo pulled up to the pile with the same results. I thought for sure it would walk right up..... 
About that time my daughter noticed that the AC went to defrost. After some searching I found that it is most likely the PVH (Pulse Vacuum Hub) Solenoid. I also found the following troubleshooting method provided by MChan68. It helped me troubleshoot, so I thought I would say thanks MChan68 and share it with everybody else.....
mchan68 Quote: This is the PVH (Pulse Vacuum Hub) solenoid. Disconnect the three wire connector to it. Turn the ignition key to the RUN position. Get out your DVOM and set it to DC-VOLTS. Check the middle wire (light blue with pinkstripe), by probing it with the red lead and connecting the black lead to your passenger side battery ground. You should see 12 volts approximately. If you're not getting 12 volts there, you'll need to check fuse #27 (15A) on the fuse panel inside the truck under the steering column, for an open circuit. If the above checks out good, reconnect the three wire connector back onto the solenoid. With the ignition key in the RUN position, connect a jumper wire or paper clip into the back side of the red wire and jump it to the passenger side battery ground terminal to test the hub DISENGAGE circuit. You should hear a click from the solenoid as you do this. Now repeat this same test on the grey with black stripe coloured wire to test the ENGAGE circuit. If you don't hear clicks from the solenoid while testing either, or both circuits, replace the PVH solenoid. The part number for the PVH solenoid is 7C3Z-9H465-A. The price of this part is as follows:
https://www.tituswillfordparts.com/c...&submit=Search
BTW, the grey w/black stripe is my failure. Will be ordering a new PVH soon! I searched Tousley, and Partsguyed with no results.
About that time my daughter noticed that the AC went to defrost. After some searching I found that it is most likely the PVH (Pulse Vacuum Hub) Solenoid. I also found the following troubleshooting method provided by MChan68. It helped me troubleshoot, so I thought I would say thanks MChan68 and share it with everybody else.....
mchan68 Quote: This is the PVH (Pulse Vacuum Hub) solenoid. Disconnect the three wire connector to it. Turn the ignition key to the RUN position. Get out your DVOM and set it to DC-VOLTS. Check the middle wire (light blue with pinkstripe), by probing it with the red lead and connecting the black lead to your passenger side battery ground. You should see 12 volts approximately. If you're not getting 12 volts there, you'll need to check fuse #27 (15A) on the fuse panel inside the truck under the steering column, for an open circuit. If the above checks out good, reconnect the three wire connector back onto the solenoid. With the ignition key in the RUN position, connect a jumper wire or paper clip into the back side of the red wire and jump it to the passenger side battery ground terminal to test the hub DISENGAGE circuit. You should hear a click from the solenoid as you do this. Now repeat this same test on the grey with black stripe coloured wire to test the ENGAGE circuit. If you don't hear clicks from the solenoid while testing either, or both circuits, replace the PVH solenoid. The part number for the PVH solenoid is 7C3Z-9H465-A. The price of this part is as follows:
https://www.tituswillfordparts.com/c...&submit=Search
BTW, the grey w/black stripe is my failure. Will be ordering a new PVH soon! I searched Tousley, and Partsguyed with no results.
Thread Starter
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Strokin Okie
Joined: Apr 2004
Posts: 1,883
Likes: 21
From: Oklahoma
Will do, thanks Rob!
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