Code No.U0121 ASC/ABS-ECU CAN timeout


caution
  • If the diagnosis code No. U0121 is set, be sure to diagnose the CAN bus line.
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of ABS-ECU or ASC-ECU
  • Malfunction of corner sensor/back sensor-ECU