| DTC Code | DTC Name |
|---|---|
| U0122 | Lost Communication with Vehicle Dynamics Control Module |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0142 | Lost Communication with Body Control Module "B" |
| U0293 | Lost Communication with HV ECU |
| U1104 | Lost Communication with Driving Support ECU |
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-crash 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-crash 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-crash 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. |
|
| 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. |
|
| 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. |
|
| 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. |
|
| U0293 |
|
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| U1104 |
|
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CAUTION / NOTICE / HINT
Note
When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed Click here.
Confirm that the connector is securely connected, as a partially connected connector is suspected for the cause of these DTCs.
PROCEDURE
CHECK DTC OUTPUT
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| A |
|
USE SIMULATION METHOD TO CHECK Click here |
| B |
|
GO TO CAN COMMUNICATION SYSTEM Click here |