Mazda RX-8 Manual page 1489

a. Malfunction in electrical system
The control module has an on-board diagnostic function. With this function, the ABS
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warning light and/or BRAKE system warning light and/or DSC indicator light and/or
DSC OFF light will illuminate when there is a problem in the electrical system.
Also, past and present malfunctions are in the control module. This function can find
malfunctions that do not occur during periodic inspections. Connect the WDS or
equivalent to the DLC-2, the stored malfunctions will be displayed in the order of
occurrence. To find out the causes of DSC malfunctions, use these on-board diagnostic
results.
If a malfunction occurred in the past but is now normal, the cause is likely a temporary
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poor connection of the wiring harness.
The control module usually operates normally. Be careful when searching for the cause
of malfunction.
After repair, it is necessary to clear the DTC from the control module memory.
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Also, if the DSC related parts have been replaced, verify that no DTC is displayed after
repairs.
After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the
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control module, the ABS warning light may not go out even when the ignition switch is
turned to the ON position. In this case, drive the vehicle at a speed of more than 10
km/h {6.2 mph} , make sure the ABS warning light goes out, and then clear the DTC.
When repairing, if the DSC related connectors are disconnected and the ignition switch is
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turned to the ON position, the control module will mistakenly detect a fault and record it
as a malfunction.
CAUTION:
To protect the control module, make sure the ignition is off before connecting or
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disconnecting the control module connector.
b. Malfunctions in hydraulic system
Symptoms in a hydraulic system malfunction are similar to those in a conventional brake
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malfunction. However, it is necessary to determine if the malfunction is in a DSC
component or the conventional brake system.
The hydraulic unit contains delicate mechanical parts. If foreign material gets into the
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component, the DSC may fail to operate. Also, it will likely become extremely difficult
to find the location of the malfunction in the event that the brakes operate but the DSC
does not. Make sure foreign material does not enter when servicing the DSC (e.g.brake
fluid replacement, pipe removal).
Intermittent Concern Troubleshooting
Vibration method
If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating,
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perform the following steps.
In DSC vehicles, when the DSC HU/CM, steering angle sensor, or combined
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sensor is replaced, perform the initialization procedure for each sensor.
(w) RX8 - Brakes
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