Mazda RX-8 Workshop Manual page 1686

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2011 - RX-8 - Brakes
NO.4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY
ON 4 S OR MORE WHEN THE IGNITION SWITCH IS TURNED TO THE ON
POSITION [ABS]
Both ABS warning light and BRAKE system warning light stay on 4 s or more when the
4
ignition switch is turned to the ON position.
[TROUBLESHOOTING HINTS]
ABS HU/CM detects ABS proportioning system malfunction.
ABS HU/CM detects low voltage in power supply (ABS CM ingestion terminal Z
voltage is below about 9 to 10 V).
ABS HU/CM does not operate.
Malfunction of communication network.
Diagnostic procedure
STEP
INSPECT ABS HU/CM POWER SUPPLY
1 FUSE
Is the ABS HU/CM ignition
power supply fuse normal?
INSPECT WIRING HARNESS BETWEEN
2
ABS HU/CM AND DLC–2 FOR
CONTINUITY AND SHORTS
Perform DTC inspection.
Is error message displayed
regarding communication
INSPECTION
YesGo to the next step.
No Inspect for a short to ground on circuit of blown
fuse.
Repair or replace if necessary.
Install appropriate amperage fuse.
YesIf a communication error message is displayed
even after inspecting according to procedure
displayed on M-MDS, go to step 10.
No Go to the next step.
ACTION