DTC C1186, C1266 [ABS]

id0402a7806100

DTC

C1186, C1266

Fail-safe relay system

DETECTION CONDITION

•  C1186

―  ABS HU/CM internal valve relay remains OFF when valve relay ON is commanded.

•  C1266

―  ABS HU/CM internal valve relay remains ON (stuck) when valve relay OFF is commanded.

POSSIBLE CAUSE

•  ABS 30A fuse malfunction

•  Open circuit or short to ground in the wiring harness between the battery and the ABS HU/CM terminal C

•  Open or short circuit in the ABS HU/CM internal valve relay, or stuck valve relay

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT ABS FUSE CONDITION • Is the ABS 30A fuse normal?	Yes	Go to the next step.
1	INSPECT ABS FUSE CONDITION • Is the ABS 30A fuse normal?	No	Replace the fuse, then go to Step 3.
2	INSPECT VALVE RELAY POWER SUPPLY FOR OPEN CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect ABS HU/CM connector. • Turn the ignition switch to the ON position (engine off). • Measure voltage between ABS HU/CM terminal C (harness-side) and ground. • Is voltage B+?	Yes	Go to the next step.
2		No	Repair or replace the wiring harness for open circuit between battery positive terminal and ABS HU/CM terminal C, then go to the next step.
3	VERIFY TROUBLESHOOTING COMPLETED • Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS [ABS].) • Is the same DTC present?	Yes	Replace the ABS HU/CM, then go to next step. (See ABS HU/CM REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS].)
4		No	DTC troubleshooting completed.

DTC	C1186, C1266		Fail-safe relay system
DETECTION CONDITION		• C1186 ― ABS HU/CM internal valve relay remains OFF when valve relay ON is commanded. • C1266 ― ABS HU/CM internal valve relay remains ON (stuck) when valve relay OFF is commanded.
POSSIBLE CAUSE		• ABS 30A fuse malfunction • Open circuit or short to ground in the wiring harness between the battery and the ABS HU/CM terminal C • Open or short circuit in the ABS HU/CM internal valve relay, or stuck valve relay • Poor connection at connectors (female terminal)