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

id0402b2880000

DTC
C1A77:12, C1A77:13, C1A77:16
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.
POSSIBLE CAUSE
•  Malfunction of fuse (ABS MOTOR 60A and ABS SOL 30A)
•  Open circuit 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

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DSC FUSE CONDITION
•  Is DSC fuse (ABS MOTOR 60A and ABS SOL 30A) normal?
Yes
Go to the next step.
No
Replace fuse, then go to Step 4.
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.
No
Repair or replace harness for open circuit between battery positive terminal and DSC HU/CM terminal AG, then go to Step 4.
3
VERIFY VALVE RELAY OPERATION
•  Switch the ignition to off.
•  Connect M-MDS to DLC-2.
•  Switch the ignition to ON (engine off).
•  Access VPWR using the M-MDS.
•  Does valve relay operate?
Yes
Go to the next step.
No
Replace DSC HU/CM, then go to the next step.
4
VERIFY TROUBLESHOOTING COMPLETED
•  Clear the DTC from the memory.
•  Is same DTC present?
Yes
Replace DSC 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 ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
No
Troubleshooting completed.