Mazda RX-8 Workshop Manual page 1562

Diagnostic procedure
STEP
INSPECT PID FOR ABNORMAL OUTPUT FROM ABS WHEEL-SPEED
1
SENSOR USING M-MDS
Turn the ignition switch off.
Connect the M-MDS to the DLC-2.
Select the following PIDs using the M-MDS:
LF_WSPD
LR_WSPD
RF_WSPD
RR_WSPD
Start the engine and drive the vehicle.
Verify that the PIDs of the four ABS wheel-speed sensors
INSPECTION ACTION
YesGo to Step 4.
No If there is a difference in
speeds of the four wheels, go
to the next step.