(Abs) Proper way to clean tone ring/tooth wheel?

Pressure washer, degreaser, BRASS wire brush, pressure wash again, then you will still wind up replacing the ring.

 

Yep, any type of cleaner. Might have to use a small screwdriver to clean any crud in between the teeth. Also, the air gap should be about 0.020" or so. Spinning it by hand is an excellent test for the sensor, so hat's off to you for knowing about that. With a new sensor and clean tone wheel you should be able to make at least 0.5 volts! Usually it is around 1 full volt ac! So make sure your sensor is close. When you install them, just push them in until they touch the tone wheel. It will move back enough on its own to make that small clearance.

 

ABS systems are extremely sensitive and very picky to any micro shorts to ground. Looks like you have a Wabco system there, but Bendix is very picky. It will log faults even if the resistance is in the MEGA ohms. So make sure you don't have any resistance to ground, should be totally open to ground. Also, I believe Wabco ABS ECU's must be programmed when you install them, they all come blank.

 

With the harness disconnected at the ECU, you find which pins are for the that sensor and stick a paper clip in the terminal and basically use your digital multi-meter and check on the OHMs setting with one lead connected to the paper clip, and the other lead connected to a good ground. Easy as that. Should be totally open or OL, or whatever your meter displays. We run new wires for sensors all the time. ABS sensors must be a twisted pair to eliminate any radio wave interference. I just take two wire lengths, secure one end in a vise or something, and attach the other ends of the wires into my drill. Hold the wires out straight, and twist them with the drill. You need at least one twist per inch. Then just tape it up so it doesn't unwind and put some nice loom over it. Polarity does not matter when splicing it in.

 

For some reason those harnesses are made up in a specific way with a specific wire and unless you follow their splicing instructions, then it will mess with the signal even more. Chances are if you are seeing pulses at the sensor and you still have issue, then it would be the harness.