DTC U0122: Lost Communication with Vehicle Dynamics Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0293: Lost Communication with HV ECU; DTC U1104: Lost Communication with Driving Support ECU [08/2015 - ]: Description

The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle. Based on this information, the driving support ECU assembly sends pre-collision control operation signals. These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.

The driving support ECU assembly sends vehicle speed and vehicle condition information to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly. The driving support ECU assembly sends this information to the ECM and performs pre-collision system operation (DTC U1104).

DTC No.	DTC Detection Condition	Trouble Area
U0122	When the power switch is on (IG), a communication error between the brake booster with master cylinder (skid control ECU) and the driving support ECU assembly is detected for 7.3 seconds or more.	CAN communication system Brake booster with master cylinder (skid control ECU) Driving support ECU assembly Wire harness or connector
U0123	When the power switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU assembly is detected 3.8 seconds or more.	CAN communication system Yaw rate sensor Driving support ECU assembly Wire harness or connector
U0126	When the power switch is on (IG), a communication error between the steering angle sensor and the driving support ECU assembly is detected for 4.8 seconds or more.	CAN communication system Steering angle sensor Driving support ECU assembly Wire harness or connector
U0142	When the power switch is on (IG), a communication error between the main body ECU (multiplex network body ECU) and driving support ECU assembly is detected for 15.2 seconds or more.	CAN communication system Main body ECU (multiplex network body ECU) Driving support ECU assembly Wire harness or connector
U0293	When the power switch is on (IG), a communication error between the power management control ECU and brake booster with master cylinder (skid control ECU) is detected for 1 seconds or more while the vehicle is being driven at a speed of 5 km/h (3 mph) or more. When the power switch is on (IG), a communication error between the power management control ECU and driving support ECU assembly is detected for 4 seconds or more while the vehicle is being driven at a speed of 5 km/h (3 mph) or more.	CAN communication system Power management control ECU Brake booster with master cylinder (skid control ECU) Driving support ECU assembly Wire harness or connector
U1104	When the power switch is on (IG), a communication error between the driving support ECU assembly and the brake booster with master cylinder (skid control ECU) is detected for 1.2 seconds or more. When the power switch is on (IG), a communication error between the driving support ECU assembly and the power management control ECU is detected for 1.8 seconds or more.	CAN communication system Brake booster with master cylinder (skid control ECU) Driving support ECU assembly Wire harness or connector