wheelspeed sensors

[41107]

98 r 1100 rt
any way of testing the wheel speed sensors on the abs system?

[Andy VH]

Well, if the ABS system lights go out when the bike has exceeded about 3mph then the signal strength from the sensors is ok. But I suppose you could check the sensor coil for continuity, since all it is, is a wire wrapped around a core. If you were to probe between the two connector pins on the sensor harness you should get continuity or a very low resistance value.

If you get a high resistance value, or basically an infinite ohms reading, then the sensor would be "open" or bad. I do not have any value for the resistance of a good wheel speed sensor.

If you could attach a voltmeter to the sensor connector wires and then spin the wheel, you should get an AC voltage ouput, though I have no idea what that value would be.

[cjack]

Well, if the ABS system lights go out when the bike has exceeded about 3mph then the signal strength from the sensors is ok. But I suppose you could check the sensor coil for continuity, since all it is, is a wire wrapped around a core. If you were to probe between the two connector pins on the sensor harness you should get continuity or a very low resistance value.

If you get a high resistance value, or basically an infinite ohms reading, then the sensor would be "open" or bad. I do not have any value for the resistance of a good wheel speed sensor.

If you could attach a voltmeter to the sensor connector wires and then spin the wheel, you should get an AC voltage ouput, though I have no idea what that value would be.

I think the impedance check is probably the best without an oscilloscope since the average voltage is probably small. I don't know the resistance value either but I would guess from the several hundreds of ohms to the several thousands of ohms.