PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0122, U0123, U0126, U0142, U0293, U1104
| 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
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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.
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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.
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CAN communication system
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Brake booster with master cylinder (skid control ECU)
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Driving support ECU assembly
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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.
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CAN communication system
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Yaw rate sensor
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Driving support ECU assembly
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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.
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CAN communication system
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Steering angle sensor
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Driving support ECU assembly
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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.
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CAN communication system
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Main body ECU (multiplex network body ECU)
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Driving support ECU assembly
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Wire harness or connector
U0293
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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.
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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.
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CAN communication system
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Power management control ECU
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Brake booster with master cylinder (skid control ECU)
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Driving support ECU assembly
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Wire harness or connector
U1104
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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.
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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.
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CAN communication system
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Brake booster with master cylinder (skid control ECU)
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Driving support ECU assembly
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Wire harness or connector
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CAUTION / NOTICE / HINT
Note
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When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed Click here.
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Confirm that the connector is securely connected, as a partially connected connector is suspected for the cause of these DTCs.
PROCEDURE
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CHECK DTC OUTPUT
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Connect the GTS to the DLC3.
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Turn the power switch on (IG).
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Turn the GTS on.
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Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.
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Check for DTCs.
Result Result Proceed to CAN communication system DTCs are not output A CAN communication system DTCs are output B
A 
USE SIMULATION METHOD TO CHECK Click here
B
GO TO CAN COMMUNICATION SYSTEM Click here
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