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 30 A 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 30 A fuse normal?
Yes
Go to the next step.
No
Replace the fuse, then go to Step 3.
2
INSPECT VALVE RELAY POWER SUPPLY FOR OPEN CIRCUIT
• Turn the ignition switch off.
• 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.
No
Repair or replace the wiring harness for open circuit between battery positive terminal and DSC HU/CM terminal C, then go to the next step.
3
VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC from the memory.
• Is the same DTC present?
Yes
Replace the ABS HU/CM, then go to next step.
No
Go to the next step.
4
VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC Table.)
No
DTC troubleshooting completed.