Code No. C1226: FR inlet valve
Code No. C1231: FR outlet valve
Code No. C1236: FL inlet valve
Code No. C1241: FL outlet valve
Code No. C1246: RR inlet valve
Code No. C1251: RR outlet valve
Code No. C1256: RL inlet valve
Code No. C1261: RL outlet valve
Code No. C1300: FR cut valve
Code No. C1305: FR suction valve
Code No. C1310: FL cut valve
Code No. C1315: FL suction valve

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 - Troubleshooting ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).

OPERATION

The ASTC-ECU contains the power supply circuit (+BV terminal) for the solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in the ASTC-ECU.
The valve relay, which is incorporated in the ASTC-ECU, is always ON except for during the initial check at electric motor switch is turned ON as well as for during the system check that is periodically repeated. While the system is active, the power is supplied to the solenoid valve at all times.
ASTC-ECU activates the solenoid valve by turning on its driving transistor.

These diagnosis codes will be set under the cases below.
Code No. C1226, C1231, C1236, C1241, C1246, C1251, C1256 and C1261

These codes are set when the ASTC-ECU drive signal does not match the feed back signal from the solenoid valve.

Code No. C1300, C1305, C1310 and C1315