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 U0140: Lost Communication with Main Body ECU; DTC U0151: Lost Communication with Airbag ECU; DTC U0293: Lost Communication with HV ECU; DTC U1002: Lost Communication with Gateway Module; DTC U1100: Lost Communication with Seat Belt Control ECU; DTC U1104: Lost Communication with Driving Support ECU [08/2014 - ]: Description

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle. Based on this information, the driving support ECU 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 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. The driving support ECU sends this information to the ECM and performs pre-collision system (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 is detected for approx. 3 seconds. When the power switch is on (IG), a communication error between the skid control ECU assembly and the seat belt control ECU is detected for approx. 3 seconds.	Brake booster with master cylinder (skid control ECU) CAN communication system Driving support ECU Wire harness or connector Seat belt control ECU
U0123	When the power switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU is detected for approx. 1 second.	Yaw rate sensor CAN communication system Driving support ECU
U0126	When the power switch is on (IG), a communication error between the steering angle sensor and the driving support ECU is detected for approx. 4 seconds.	Steering angle sensor CAN communication system Driving support ECU
U0140	When the power switch is on (IG), communication stop between the main body ECU and seat belt control ECU continues for 6 seconds or more.	Main body ECU CAN communication system Seat belt control ECU Wire harness or connector
U0151	When the power switch is on (IG), communication stop between the center airbag sensor and seat belt control ECU continues for 6 seconds or more.	Center airbag sensor CAN communication system Seat belt control ECU 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 approx. 1 second. When the power switch is on (IG), a communication error between the power management control ECU and driving support ECU is detected for approx. 4 seconds.	Power management control ECU Brake booster with master cylinder (skid control ECU) CAN communication system Driving support ECU
U1002	When the power switch is on (IG), communication stop between the millimeter wave radar sensor assembly and driving support ECU assembly continues for 1 second or more.	Millimeter wave radar sensor CAN communication system Driving support ECU assembly
U1100	When the power switch is on (IG), a communication error between the seat belt control ECU and the driving support ECU is detected for approx. 9 seconds.	Seat belt control ECU CAN communication system Driving support ECU
U1104	When the power switch is on (IG), a communication error between the driving support ECU and the millimeter wave radar sensor is detected for approx. 1 second. When the power switch is on (IG), a communication error between the driving support ECU and the power management control ECU is detected for approx. 1 second. When the power switch is on (IG), a communication error between the driving support ECU and seat belt control ECU is detected for approx. 1 second.	Communication circuit Millimeter wave radar sensor Driving support ECU CAN communication system Wire harness or connector