Mazda RX-8 Manual page 1458

Clearance
0.31.1 mm {0.0120.043 in}
o
Resistance Inspection
1. Measure the resistance between the ABS wheel-speed sensor terminals.
If there is any malfunction, replace the ABS wheel-speed sensor.
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Standard
1.31.7 kilohms
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Voltage Pattern Inspection
1. Lift up the vehicle, and connect an oscilloscope to the ABS wheel-speed sensor connector.
2. While rotating each wheel by hand inspect the voltage pattern.
If there is distortion or noise, inspect the sensor rotor.
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Voltage pattern (reference)
Oscilloscope setting:
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1 V/DIV (Y), 2 ms/DIV (X), AC range
Vehicle condition: Driving 30 km/h (18.6 mph)
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NOTE:
As the vehicle speed increases, the voltage increases and the wave period shortens.
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Sensor Output Value Inspection
1. Turn the ignition switch off.
2. Connect the WDS or equivalent to the DLC-2.
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(w) RX8 - Brakes
Page 44