ABS Speed sensor

[tcmichnorth]

This system is an active 2 wire system. There is supposed to be battery voltage at all times with key on on supply wire. The other wire is the signal wire. It returns voltages in a square wave pattern. When wheel is turning, I should see voltage ranging from .6 to 1.2 volts. My initial mistake was that I thought this was a passive sensor. You can check a passive sensor using ohm meter. You cannot check active sensor that way. The old sensor had bare wire showing. That would not be anything to worry about on a passive system, but an active system has battery voltage and it could have shorted something. I also noted when I found my diagram that on Hondas and a few other models that if you unplug the sensor, the module shuts down the reference voltage to the sensor. So I have to backprobe to test. My concern now is if I don’t find voltage at the sensor or at the LFPij at the VSA module I’ll probably have to replace module. I don’t know yet, but the diagram does not show separate circuits for each sensor. On Saturday I’ll know more when I get the car and do some voltage tests