DTC U1120: Failure Information On Powertrain Control Module (Related To Engine): Notes
CAUTION:
If DTC U1120 is set in the A/C-ECU, diagnose the CAN main bus line.
CAUTION:
Whenever the ECU is replaced, ensure that the communication circuit is normal.
CAUTION:
The engine control system- related DTC may be set when DTC U1120 is set. (For details refer to
INTERSYSTEM AFFILIATED DTC REFERENCE TABLE
). Diagnose the engine control system first when the engine control system- related DTC is set.