#
DTC C1186, C1266 [ABS (ABS/TCS)]

id040214806100

DTC | C1186, C1266 | Fail-safe relay
DETECTION CONDITION | • C1186: - Fail-safe relay in ABS (ABS/TCS) HU/CM stuck OFF when ignition key is turned ON, fail-safe relay ON is commanded. • C1266: - Fail-safe relay in ABS (ABS/TCS) HU/CM stuck ON when ignition key is turned ON, fail-safe relay OFF is commanded.
POSSIBLE CAUSE | • Malfunction of fuse (ABS 60 A) • Open circuit in harness between ABS (ABS/TCS) HU/CM terminal AA and battery positive terminal • Open circuit or short of fail-safe relay in ABS (ABS/TCS) HU/CM • Stuck fail-safe relay in ABS (ABS/TCS) HU/CM

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT ABS FUSE CONDITION • Is ABS fuse (60 A) normal? | Yes | Go to the next step.
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 (ABS/TCS) HU/CM connector. • Turn the ignition switch to the ON position (engine off). • Measure voltage between ABS (ABS/TCS) HU/CM terminal AA (harness-side) and ground. • Is voltage B+? | Yes | Go to the next step.
No | Repair or replace harness for open circuit between battery positive terminal and ABS (ABS/TCS) HU/CM terminal AA, then go to Step 4.
3 | VERIFY FAIL-SAFE OPERATION • Turn the ignition switch off. • Connect WDS or equivalent to DLC-2. • Turn the ignition switch to the ON position (engine off). • Access ABS_VOLT using the WDS or equivalent. • Does fail-safe relay operate? | Yes | Go to the next step.
No | Replace ABS (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 (ABS/TCS) HU/CM, then go to the next step.
No | Go to the next step.
5 | VERIFY AFTER REPAIR PROCEDURE • Is there any other DTC present? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | Troubleshooting completed.