I have a digital volt meter which also reads ohms but I have no idea how to test the speed sensor. How to, where to connect and stuff. I need some guidance on this one. 99 F150 4x4 Thanks.

 

Ok, I figured out how to test them.

The 2 front sensors are giving me 400 ohms each and it goes up a little as I spin the wheel.

The rear sensor reads about 1800 ohms and also goes up when I spin the wheel.

Is that about right ? Does this mean the sensors are good ?
99 F150

 

ok, now I'm a little confused.... Is the sensor that is mounted on the hub assembly the abs sensor or the speed sensor ? or is it both ?

 

the pickup in the hub is the ABS. Some call it a "speed" because it measures the revolutions and compares to the other front wheel, and rear axle to compare and see if one is locking up, or slipping.

 

ah, thanks for clearing that up .what about those readings I got from them....is that about right and does that mean they're fuctioning properly ?

 

i dont really know the resistance. wonder why the back one reads 4 x as much? could be bad, or maybe becasue the gear is 4 x larger? is this why you took it apart?

 

You may need to use your low AC scale because they are magnetic field change sensing and produce a voltage output the module uses when the wheel is rotating.
Resistance is for general static measure to check for shorts and opens in the sensor and it's connecting cable.