Join Date: Feb 2017
Location: St. Louis, Missouri
Unfortunately, the technical data concerning the range of acceptable wheel speed sensor readings isnt readily available, at least not to me. Do all the sensor rotors have the same number of slots among models in the same line, do they fit all the brake rotors, is there a difference in logic and strategy in the ABS control units? Beats me!
What I have done is use my labscope or the vehicle manufacturer's dedicated diagnostic computer and monitor the waveforms of the wheel speed sensors as seen by the control unit.
With the oem's diagnostic computer you could obtain a diagnostic trouble code, then monitor the wave forms of all the sensors to verify the reason for the code. Example:you see a square-tooth patern on a vehicle with square-tooth tone rings on the axle, and notice that one of the sensors shows an intermittent or missing pattern. Visual inspection shows a loose tone ring on the axle, cracked by rust formation between the 2 parts. Replace the tone ring, clear the code, recheck the readings, all now look good, and road test to verify the repair. Or Ive seen bad sensors with poor resistance readings, loose sensors, torn sensor wire harness,--even loose wheel bearings. With an volt-ohmmeter you can check the wire harness between the sensor and the control unit, the resistance of the sensor itself, and generated voltage in some systems. If all that checks good, and all control unit inputs and circuits to and from the control unit are good, by process of elimination it HAS to be a control unit issue.
What I havent seen is if there is a stored DTC in the OP's ABS control unit that would identify for sure what area of the ABS system is a problem. Again, it started with the tire change. Unless something was damaged during the work, or there was a coincidental failure, I would suspect a change in tire diameters as the culprit. Unfortunately once the old tires are deflated and off the rims, there is no way to get accurate measurements to compare what was on the bike to what is now on the bike. The best he could do would be to measure the tread depth differences between the old and the new tires. Between cars and motorcycles, there is very little operational differences between ABS systems.
Just half as many speed sensors to deal with.
Last edited by MAZ4ME; 03-22-2019 at 03:02 AM.