Code No.C1226: Abnormality In FR Wheel Inlet Valve System
Code No.C1231: Abnormality In FR Wheel Outlet Valve System
Code No.C1236: Abnormality In FL Wheel Inlet Valve System
Code No.C1241: Abnormality In FL Wheel Outlet Valve System
Code No.C1246: Abnormality In RR Wheel Inlet Valve System
Code No.C1251: Abnormality In RR Wheel Outlet Valve System
Code No.C1256: Abnormality In RL Wheel Inlet Valve System
Code No.C1261: Abnormality In RL Wheel Outlet Valve System
Code No.C1300: Abnormality In FR Cut Valve System
Code No.C1305: Abnormality In FR Suction Valve System
Code No.C1310: Abnormality In FL Cut Valve System
Code No.C1315: Abnormality In FL Suction Valve System


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
  • Before replacing the ECU, ensure that the communication circuit is normal.
OPERATION
  • TCL/ASC-ECU contains the power supply circuit (terminal No.44) for the solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in TCL/ASC-ECU.
  • The valve relay, which is incorporated in TCL/ASC-ECU, is always energising the solenoid valve unless the initial check is in progress when the ignition switch is turned on, or the recurrent system check is in progress.
  • TCL/ASC-ECU activates the solenoid valve by turning on its driving transistor.

DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes will be set under the cases below:
Code No.C1226, C1231, C1236, C1241, C1246, C1251, C1256, C1261
  • The solenoid valve is not energized even after TCL/ASC-ECU has turned on the driving transistor (Open circuit is present in the power supply circuit to the TCL/ASC-ECU solenoid valve, or the valve relay has failed).
  • The solenoid valve is not energised even after TCL/ASC-ECU has turned on the driving transistor (Open circuit is present in the solenoid valve circuit in TCL/ASC-ECU, or the valve relay has failed).
  • After TCL/ASC-ECU has turned off the driving transistor, the solenoid valve still remains energized (short in the solenoid valve circuit).
  • When a solenoid valve failure is detected
Code No.C1300, C1305, C1310, C1315
  • When the TCL/ASC-ECU failure is detected

PROBABLE CAUSES

  • Damaged wiring harness or connector
  • TCL/ASC-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ).On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

Q. Is the relevant diagnosis code set?
Replace the hydraulic unit (integrated with TCL/ASC-ECU) (Refer to ). Then go to Step 3.
This diagnosis is complete.

STEP 3. Check whether the diagnosis code is reset.

Q. Is the relevant diagnosis code set?
Return to Step 1.
This diagnosis is complete.