Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC C1186, C1266 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT ABS FUSE CONDITION Is ABS fuse (60 A) okay?	Yes	Go to the next step.
1	INSPECT ABS FUSE CONDITION Is ABS fuse (60 A) okay?	No	Replace fuse, then go to Step 4.
2	INSPECT FAIL-SAFE RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Turn the ignition switch off. Disconnect ABS/TCS HU/CM connector. Connect SST (adapter harness) to ABS/TCS HU/CM connector (harness side only). Turn ignition key to ON (engine off). Measure voltage between ABS/TCS HU/CM terminal AA (harness side) of SST and ground. Is voltage B+ ?	Yes	Go to the next step.
2		No	Repair or replace harness for open circuit between battery positive terminal and ABS/TCS HU/CM terminal AA, then go to Step 4.
3	VERIFY FAIL-SAFE OPERATION Turn the ignition switch off. Remove SST (adapter harness) and connect all disconnected connectors. Connect WDS or equivalent to DLC-2. Turn ignition key to ON (engine off). Access ABS_VOLT using the WDS or equivalent. Does fail-safe relay operate?	Yes	Go to the next step.
3		No	Replace ABS/TCS HU/CM, then go to the next step.
4	VERIFY TROUBLESHOOTING COMPLETED Clear the DTC from the memory. (See CLEARING DTCS PROCEDURES ) Is same DTC present?	Yes	Replace ABS/TCS HU/CM, then go to the next step.
4		No	Go to the next step.
5	VERIFY AFTER REPAIR PROCEDURE Is there any other DTC present?	Yes	Go to the applicable DTC inspection.
5		No	Troubleshooting completed.