DTC U1120: CAN Communications System TCL Uncontrollable by Engine Malfunction: Notes
CAUTION:
- If DTC U1120 is set in the TCL/ASC-ECU, always diagnose the CAN main bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set.
- Whenever the TCL/ASC-ECU is replaced, ensure that the communication circuit is normal.
- The engine control system-related DTC may be set when DTC U1120 is set. Diagnose the engine control system first when the engine control system-related DTC is set.