ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:U0073, U0110, U0120, U0124, U0126, U0293

DTC Code	DTC Name
U0073	Control Module Communication Bus Off
U0110	Lost Communication with Drive Motor Control Module "A"
U0120	Lost Communication With Starter / Generator Control Module
U0124	Lost Communication With Lateral Acceleration Sensor Module
U0126	Lost Communication With Steering Angle Sensor Module
U0293	Lost Communication with Hybrid Vehicle Control System

DESCRIPTION

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

The skid control ECU (brake booster with master cylinder assembly) receives signals from the hybrid vehicle control ECU, steering angle sensor, certification ECU (smart key ECU assembly), inverter with converter assembly and yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
U0073	Control Module Communication Bus Off	461 462 463	INF Code: 461 Either of the following is detected: Yaw rate and acceleration sensor communication is disabled for 1 second or more. Yaw rate and acceleration sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds. INF Code: 462 Either of the following is detected: Steering angle sensor communication is disabled for 1 second or more. Steering angle sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds. INF Code: 463 Bus off occurs once or more per 0.1 seconds 10 times repeatedly.	INF Code: 461 CAN communication line Yaw rate and acceleration sensor (airbag sensor assembly) Skid control ECU (brake booster with master cylinder assembly) INF Code: 462 CAN communication line Steering angle sensor Skid control ECU (brake booster with master cylinder assembly) INF Code: 463 CAN communication line Skid control ECU (brake booster with master cylinder assembly)	Electronically controlled brake system DTC
U0110	Lost Communication with Drive Motor Control Module "A"	1153 1154	INF Code: 1153 When terminal IG2 voltage is 9.5 V or more, data from the inverter with converter assembly cannot be received for 2 seconds or more. INF Code: 1154 When terminal IG2 voltage is 9.5 V or more, the condition in which data from the inverter with converter assembly cannot be received once or more within 5 seconds occurs 10 times in succession.	CAN communication line Inverter with converter assembly Skid control ECU (brake booster with master cylinder assembly)	Electronically controlled brake system DTC
U0120	Lost Communication With Starter / Generator Control Module	1158	Push start switch data is invalid for 3 seconds or more.	CAN communication line Certification ECU (smart key ECU assembly) Skid control ECU (brake booster with master cylinder assembly)	Electronically controlled brake system DTC
U0124	Lost Communication With Lateral Acceleration Sensor Module	591 592	INF Code: 591 Acceleration sensor communication is disabled for 1 second or more. INF Code: 592 Acceleration sensor communication is disabled once or more per 5 seconds 10 times or more within 60 seconds.	CAN communication line Acceleration sensor (airbag sensor assembly) Skid control ECU (brake booster with master cylinder assembly)	ABS DTC
U0126	Lost Communication With Steering Angle Sensor Module	741 742	INF Code: 741 Steering angle sensor communication is disabled for 1 second or more. INF Code: 742 Steering angle sensor communication is disabled once or more per 5 seconds10 times or more within 60 seconds.	CAN communication line Steering angle sensor Skid control ECU (brake booster with master cylinder assembly)	VSC DTC
U0293	Lost Communication with Hybrid Vehicle Control System	411 412 413	INF Code: 411, 413 When terminal IG2 voltage is 9.5 V or more, data from the hybrid vehicle control ECU cannot be received for 2 seconds or more. INF Code: 412 When terminal IG2 voltage is 9.5 V or more, the condition in which data from the hybrid vehicle control ECU cannot be received once or more within 5 seconds occurs 10 times in succession.	CAN communication line Hybrid vehicle control ECU Skid control ECU (brake booster with master cylinder assembly)	Electronically controlled brake system DTC

DTC Detection Conditions: U0073 INF Code: 461
		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	Yaw rate and acceleration sensor communication is disabled.	○	-
Malfunction Status	Communication with the yaw rate and acceleration sensor is invalid once or more within 5 seconds.	-	○
Detection Time		1 second or more	Occurs 10 times or more within 60 seconds
Number of Trips		1 trip	1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: U0073 INF Code: 462
		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	Steering angle sensor communication is disabled.	○	-
Malfunction Status	Communication with the steering angle sensor is invalid once or more within 5 seconds.	-	○
Detection Time		1 second or more	Occurs 10 times or more within 60 seconds
Number of Trips		1 trip	1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

PROCEDURE

CHECK DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the power switch off.
Turn the power switch on (IG).

Check if the same DTC is output.

Chassis > ABS/VSC/TRC > Trouble Codes

Tech Tips

If CAN communication system DTCs and relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for the ABS, VSC and/or electronically controlled brake system) after the CAN communication system returns to normal.

Click here

Result

Result	Proceed to
CAN communication system DTCs are output.	A
DTCs are not output.	B

INSPECT CAN COMMUNICATION SYSTEM Click here

USE SIMULATION METHOD TO CHECK Click here