p0500 help

[integrx18]

I have been messing with my 97 ranger 4x4 4.0l automatic for about a week now. the speedometer originally stopped working. then I noticed the dome lights and wipers went as well. I found an identical gem module. everything went back to working correctly except the speedometer. I did some testing and found that the ground to the vss on the transfer case was bad and ran a new ground wire directly to the vss. now the speedometer works fine but im getting a p0500 and when I plug in my scan tool I get no vehicle speed reading. I tested the grey and black wire at the pcm and it has ac voltage the coordinates with the voltage right at the sensor. I test the rear abs speed sensor and have 1157 ohms from the sensor unplugged. I cant find what kind of readings I should get coming from the sensor on the two wires that come from the connector on that rear abs speed sensor in the rear diff. the red wire gives me a reading that higher ac voltage with speed . green wire does nothing. any help? I don't even know if the rear sensor would give a p0500. please help im going nuts.

 

[integrx18]

? Hellllp please

nobody can help me out here? im trying to sell the truck and have spent about 3 days testing things. someone has to have some idea? is there any reason other than the vss and signal that can cause the p0500? I cant believe that the ecu could be faulty just for this. nothing else is wrong with the truck.

 

[black_demon69]

this might help
http://www.autocodes.com/p0500_ford.html

 

[Pauls 4x4]

Check the vss resistance should be 190-250. The abs doesn't feed your ecm on a 95. Because it had an open ground a bad vss or signal wire is a good guess from what you tested. Because it's obd1 the code means "sensor unseen" and not much else.