DTC U1109: ETACS-Ecu Time-Out: Notes
WARNING: This page is about a different car, the 2004 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
If DTC U1109 is set in the combination meter, diagnose the CAN main bus line.
CAUTION:
Whenever the ECU is replaced, ensure that the communication circuit is normal.