DTC C1186, C1266 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2806100

DTC

C1186, C1266

Valve relay system

DETECTION CONDITION

•  C1186

―  Five or more solenoid valve malfunctions are detected (solenoid valve is determined when the solenoid valve operation does not correspond to the solenoid ON/OFF signals from the DSC HU/CM).

―  Valve relay voltage is continuously less than 80% of the ignition voltage for 0.5 s.

―  Short circuit to ground is detected in the valve relay power supply circuit and valve relay.

―  Open circuit is detected in the valve relay power supply circuit, or open circuit or sticking (OFF side) is detected in the valve relay.

•  C1266

―  DSC HU 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 DSC HU/CM terminal C

•  Open or short circuit in the DSC HU/CM internal valve relay, or stuck valve relay (DSC HU/CM malfunction)

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT FUSE CONDITION • Is the ABS 30A fuse normal?	Yes	Go to the next step.
1	INSPECT 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 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.
2		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 • Make sure to reconnect all disconnected connectors. • Clear the DTC from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Start the engine and drive the vehicle. • Is the same DTC present? (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)	Yes	Replace the DSC HU/CM, then go to next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present? (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
4		No	DTC troubleshooting completed.

DTC	C1186, C1266		Valve relay system
DETECTION CONDITION		• C1186 ― Five or more solenoid valve malfunctions are detected (solenoid valve is determined when the solenoid valve operation does not correspond to the solenoid ON/OFF signals from the DSC HU/CM). ― Valve relay voltage is continuously less than 80% of the ignition voltage for 0.5 s. ― Short circuit to ground is detected in the valve relay power supply circuit and valve relay. ― Open circuit is detected in the valve relay power supply circuit, or open circuit or sticking (OFF side) is detected in the valve relay. • C1266 ― DSC HU 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 DSC HU/CM terminal C • Open or short circuit in the DSC HU/CM internal valve relay, or stuck valve relay (DSC HU/CM malfunction) • Poor connection at connectors (female terminal)