90 efi E40D

Hello everyone, I’ve been running in circles with my 90 f150. While I was driving my truck all of a sudden started shifting late into 2nd gear or skipping it all together. I’ve started checking the sensors on the transmission. My truck has a speed sensor at the tail shaft, and I’m only getting about 3.5 volts to the sensor. I’m curious if any knows what the in voltage should be, and how to find a potential loss in voltage on these trucks. Any other tips are greatly appreciated.

 

That sensor puts out a frequency, not a voltage.

What codes are stored in the PCM? Here is how to read them: www.troublecodes.net/ford

 

I’ll have to run the codes when I get home, what should I get at the plug coming from the Truck? The sensor gave me about 205 ohms.