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Check Fuse 16 in the fuse panel under the dash. It supplies power to the cigar lighter and the diagnostic data link. Very common failure. With that fuse blown no codes will be displayed. Usually get a link failure message.
Follow the instructions in the manual to pull codes. There is an index of what the codes mean, but they may not be correct. The number will be correct, but the description may be wrong. Post the number you get here, and someone with a manual will give you the correct description.
It also has 250,000 hard miles on it and the the transfer case seems to be leaking if that helps
Check for slop/play in the transfer case tail housing bushing. At that mileage I wouldn't be surprised if it was allowing the front of the driveshaft to move around. We have about the same miles on our trucks and I've got play there that causes a vibration around 70
I have an inova scan tool, and I'm unable to pull these codes. It will only give me the egr flow code which is a different issue. I have even hooked it up while the od light is flashing and nothing. Any suggestions?
Unfortunately, the early OBD2 Ford vehicles do not give out transmission codes over the OBD2 port to generic OBD2 scan tools.
You'll either need to take it to a dealer to get the codes, or if you have a smartphone or a laptop, you need to get a Bluetooth OBD2 adapter, and use the freely available ForScan software to get the codes. You can get these adapters for about $15
The reviews are good enough that I suspect they should. But remember, you will need a smartphone or laptop with bluetooth and the FORScan app to use that device. It's $5 for Android/iOS and free for Windows PC.
Also, if you plan on using the smartphone version, you cannot use the bluetooth adapter with iPhones. The bluetooth adapter only works with Android devices. An iPhone will require a WiFi OBD2 adapter.