DTC C1A77:12/C1A77:13/C1A77:16 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2880000

DTC

C1A77:12, C1A77:13, C1A77:16

Solenoid valve relay

DETECTION CONDITION

•  C1A77:12

―  Valve relay in DSC HU/CM stuck ON when switched the ignition to ON, valve relay OFF is commanded.

•  C1A77:13, C1A77:16

―  Valve relay in DSC HU/CM stuck OFF when valve relay ON is commanded.

FAIL-SAFE FUNCTION

•  Refer to “Fail-safe Function Malfunction Contents”. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].)

POSSIBLE CAUSE

•  Malfunction of fuse (MAIN 200A, ABS/DSC S 30A)

•  Open circuit or short to ground in harness between DSC HU/CM terminal AG and battery positive terminal

•  Open circuit or short of valve relay in DSC HU/CM

•  Stuck valve relay in DSC HU/CM

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT FUSE CONDITION • Is the fuse (MAIN 200A, ABS/DSC S 30A) normal?	Yes	Go to the next step.
1		No	Replace the fuse, then go to Step 3.
2	INSPECT VALVE RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Switch the ignition to off. • Disconnect DSC HU/CM connector. • Switch the ignition to ON (engine off). • Measure voltage between DSC HU/CM terminal AG (harness-side) and ground. • Is voltage B+?	Yes	Go to the next step.
2		No	Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and DSC HU/CM terminal AG. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to next step.
3	VERIFY DTC TROUBLESHOOTING COMPLETED • Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DYNAMIC STABILITY CONTROL (DSC)].) • Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DYNAMIC STABILITY CONTROL (DSC)].) • Is the same DTC present?	Yes	Repeat the inspection from Step1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	VERIFY NO DTC IS PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].)
4	VERIFY NO DTC IS PRESENT • Are any DTCs present?	No	DTC troubleshooting completed.

DTC	C1A77:12, C1A77:13, C1A77:16		Solenoid valve relay
DETECTION CONDITION		• C1A77:12 ― Valve relay in DSC HU/CM stuck ON when switched the ignition to ON, valve relay OFF is commanded. • C1A77:13, C1A77:16 ― Valve relay in DSC HU/CM stuck OFF when valve relay ON is commanded.
FAIL-SAFE FUNCTION		• Refer to “Fail-safe Function Malfunction Contents”. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)].)
POSSIBLE CAUSE		• Malfunction of fuse (MAIN 200A, ABS/DSC S 30A) • Open circuit or short to ground in harness between DSC HU/CM terminal AG and battery positive terminal • Open circuit or short of valve relay in DSC HU/CM • Stuck valve relay in DSC HU/CM • Poor connection at connectors (female terminal)