Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AZ9B
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 - 08/2021]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): U0073,U0100,U0123,U0126,U0142,U0151; Control Module Communication Bus Off; 2019 - 2021 MY Avalon [04/2018 - 08/2021]

DTC

U0073

Control Module Communication Bus Off

DTC

U0100

Lost Communication With ECM/PCM "A"

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

U0151

Lost Communication With Restraints Control Module

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering angle sensor, yaw rate and acceleration sensor (airbag sensor assembly), airbag sensor assembly and main body ECU (multiplex network body ECU) via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0073

Control Module Communication Bus Off

The +BS terminal voltage is between 9.6 and a 16.5 V and a bus OFF state occurs for 0.1 seconds or more.

CAN communication system

U0100

Lost Communication With ECM/PCM "A"

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals cannot be sent to the ECM for 2 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM

U0123

Lost Communication With Yaw Rate Sensor Module

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the yaw rate and acceleration sensor cannot be received for 1 second or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Yaw rate and acceleration sensor (airbag sensor assembly)

U0126

Lost Communication With Steering Angle Sensor Module

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the steering angle sensor cannot be received for 1 second or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Steering angle sensor

U0142

Lost Communication with Body Control Module "B"

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, data cannot be received from main body ECU (multiplex network body ECU) continuously for 2 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Main body ECU (multiplex network body ECU)

U0151

Lost Communication With Restraints Control Module

The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle speed is 6 km/h (4 mph) or more, and signals from the airbag sensor assembly cannot be received for 5 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Airbag sensor assembly

PROCEDURE

1.

CHECK DTC OUTPUT (HEALTH CHECK)

(a) Clear the DTCs.

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG).

(d) Enter the following menus: System Select / Health Check.

(e) Check for DTCs.

Result

Proceed to

DTCs for related systems are output together with DTC U0073, U0100, U0123, U0126, U0142 or U0151.

A

U0073, U0100, U0123, U0126, U0142 or U0151 is output

B

DTCs are not output

C
A

GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM)
B

INSPECT CAN COMMUNICATION SYSTEM

C

USE SIMULATION METHOD TO CHECK