Checking sensor resistance
Disconnect the ABS wheel speed sensor connector
Remove 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 braking system wheel speed sensor. Resistance: 1.3-1.7 kOhm
Voltage test
Put the car on a level surface, jack it up and lower it onto stands.
Disconnect the ABS wheel speed sensor connector.
Test 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 (AC).
Checking the sensor waveform
Put the car on a level surface, jack it up and lower it onto stands.
Disconnect the ABS wheel speed sensor connector.
Using an oscilloscope, check the voltage waveform for distortion and noise as each wheel rotates (Figure 2).
If there is distortion or noise, check the anti-lock brake sensor rotor.