Trouble Judgment

Check Conditions 

• The power supply circuit system DTC C1540, C1541 is not stored.
• The ETACS circuit system DTC is not stored.

Judgment Criterion 

• The coding data from the ETACS-ECU are not matched twice consecutively.
• The abnormal coding data is sent from the ETACS-ECU, and the microcomputer determines that there is a problem in the system.

Fail Safe, Back Up Function 

• The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then stores DTC U1417.