Pic. 6.58. Rear ABS wheel speed sensor: 1 - connector; 2 - bolts of mounting brackets; 3 - sensor
Checking clearance between wheel speed sensor and sensor rotor
Pic. 6.59. Checking clearance between wheel speed sensor and sensor rotor
Check clearance between wheel speed sensor and sensor rotor (pic. 6.59).
Gap: 0.3–1.1 mm.
Resistance test
Disconnect the ABS wheel speed sensor connector.
Loosen the mounting bracket bolts and disconnect the ABS sensor.
Check the resistance of the anti-lock braking system wheel speed sensor.
If the resistance is not correct, replace the anti-lock brake wheel speed sensor.
Resistance: 1.3-1.7 kOhm.
Voltage test
Park the vehicle on a level surface, jack it up and lower it onto stands.
Disconnect the ABS wheel speed sensor connector.
Check each sensor while rotating each wheel at one revolution per second.
If the values are not correct, replace the anti-lock braking system wheel speed sensor.
Voltage: 0.25-1.2V (alternating current).
Waveform Check
Park the vehicle on a level surface, jack it up and lower it onto stands.
Disconnect the ABS wheel speed sensor connector.
Pic. 6.60. Waveform Check Chart
Using an oscilloscope, check the voltage waveform for distortion and noise as each wheel rotates (pic. 6.60).
If there is distortion or noise, check the anti-lock brake sensor rotor.