DTC C1186, C1266SM2445152
DTC C1186, C1266

id040200801300

DTC
C1186, C1266
Valve relay system
DETECTION CONDITION
• C1186
― DSC HU/CM internal valve relay remains OFF when valve relay ON is commanded.
• C1266
― DSC HU/CM internal valve relay remains ON (stuck) when valve relay OFF is commanded.
POSSIBLE CAUSE
• ABS 2 20A fuse malfunction
• Open circuit or short to ground in the wiring harness between the battery and the DSC HU/CM terminal C
• Open or short circuit in the DSC HU/CM internal valve relay, or stuck valve relay
• Poor connection at connectors (female terminal)

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DSC FUSE CONDITION
• Is the ABS 2 20A 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 to the LOCK position.
• Disconnect DSC HU/CM connector.
• Turn the ignition switch to the ON position (engine off).
• Measure voltage between DSC 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. (See ON-BOARD DIAGNOSIS.)
• Is the same DTC present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)
(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
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.)
No
DTC troubleshooting completed.