Mazda RX-8 Workshop Manual page 1565

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2011 - RX-8 - Brakes
DTC C1186, C1266 [ABS]
C1186,
DTC
C1266
DETECTION
CONDITION
POSSIBLE
CAUSE
Valve relay
C1186
ABS HU/CM internal fail-safe relay remains OFF (stuck)
when valve relay ON is commanded.
C1266
ABS HU/CM internal fail-safe relay remains ON (stuck)
when valve relay OFF is commanded.
ABS/DSC 40 A fuse malfunction
Open circuit or short to ground in the wiring harness between the
battery and the ABS HU/CM terminal AA
Open or short circuit in the ABS HU/CM internal valve relay, or stuck
valve relay
Poor connection at connectors (female terminal)
ABS HU/CM malfunction