Code No.U0121 ABS/ASC CAN timeout


caution
  • If diagnosis code No. U0121 is set to the ETACS-ECU, always diagnose the CAN bus line.
  • Before replacing the ECU, ensure that the communication circuit is normal.

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA




  • No abnormality is present to the network.
  • Ignition switch is in the ON position.
  • No abnormality is present to the power supply fuse (IOD fuse), or the odometer value is at 80.5 km or more.
  • ETACS-ECU system voltage is at 10-16 V.

PROBABLE CAUSES



  • Malfunction of the ABS-ECU <vehicles without ASC>
  • Malfunction of the ASC-ECU <vehicles with ASC>
  • Malfunction of the ETACS-ECU
  • Malfunction of the CAN bus