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/RL cut valve system
Code No. C1305 Abnormality in FR/RL suction valve system
Code No. C1310 Abnormality in FL/RR cut valve system
Code No. C1315 Abnormality in FL/RR 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 - CAN Bus Diagnostics Table ).
  • Before replacing the ECU, ensure that the communication circuit is normal.
OPERATION
  • ASC-ECU contains the power supply circuit (terminal No.25) for the solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in ASC-ECU.
  • The valve relay, which is incorporated in 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.
  • 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 ASC-ECU has turned on the driving transistor (Open circuit is present in the power supply circuit to the ASC-ECU solenoid valve, or the valve relay has failed).
  • The solenoid valve is not energised even after ASC-ECU has turned on the driving transistor (Open circuit is present in the solenoid valve circuit in ASC-ECU, or the valve relay has failed).
  • After 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 ASC-ECU failure is detected

PROBABLE CAUSES



  • Damaged wiring harness or connector
  • 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 Diagnostics Table ).On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is reset.


Erase the diagnosis code.

Q. Is the relevant diagnosis code set?

Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 3.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 3. Check whether the diagnosis code is reset.


Erase the diagnosis code.

Q. Is the relevant diagnosis code set?

Return to Step 1.
This diagnosis is complete.