DTC B1731: ECM authentication timeout: Notes
CAUTION:
- When DTC B1731 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
ETACS-ECU checks if the data from the engine control module is received via the CAN bus line. When ETACS-ECU cannot receive the engine control module data, it sets DTC B1731.