Wheel Speed Transducer Output

Troubleshooting a Anti-Skid issue which was faulting the #3 wheel.
  
  
We looked at the output of a functioning transducer vs. the faulted one. The drill being used only had two speeds (fast/slow), but it was able to show what our issue was.
  
     
     


A/C voltage should increase with speed. On the #7 wheel input, it did. On the #3, it "dropped" as we spun it faster.

Our problem? A high resistance short between both wires and shield of the twisted pair wire coming off the back of the transducer in the strut.
  
     
     
 

On the repair, we thought that we could just replace the wire in question. That was the wrong assumption.
You replace the the entire harness assembly from mid-strut down to the user systems (brake temp, wheel speed, and one gear tilt sensor).
  
     
  
Before tackling the job, I made up a by-pass jumper and connected directly from the #3 speed transducer to the J-Plug at the mid-strut level. Our voltage readings were correct.
  
     
  
Now..... the "fun" part of replacement.
  
     
     
     
  
Baked on carbon dust, Skydrol carbon dust, oil carbon dust..... you're covered, your tools are covered, clothes..... "not" the most pleasant job!!!