Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AAW5
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 - 08/2021]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM (for Gasoline Model): U0100,U0125,U0126,U0129; Lost Communication with ECM / PCM "A"; 2019 - 2021 MY Avalon [04/2018 - 08/2021]

DTC

U0100

Lost Communication with ECM / PCM "A"

DTC

U0125

Lost Communication with Yaw Rate Sensor Module

DTC

U0126

Lost Communication with Steering Angle Sensor Module

DTC

U0129

Lost Communication with Brake System Control Module

DESCRIPTION

The driving support ECU assembly communicates with each sensor and ECU via CAN communication.

If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

U0100

Lost Communication with ECM / PCM "A"

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and driving support ECU assembly is detected for approximately 1 second or more.
  • CAN communication system
  • ECM
  • Driving support ECU assembly

Does not come on

U0125

Lost Communication with Yaw Rate Sensor Module

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate and acceleration sensor (airbag sensor assembly) and driving support ECU assembly is detected for approximately 1 second or more.
  • CAN communication system
  • Yaw rate and acceleration sensor (Airbag sensor assembly)
  • Driving support ECU assembly

Does not come on

U0126

Lost Communication with Steering Angle Sensor Module

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and driving support ECU assembly is detected for approximately 1 second or more.
  • CAN communication system
  • Steering sensor
  • Driving support ECU assembly

Does not come on

U0129

Lost Communication with Brake System Control Module

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and driving support ECU assembly is detected for approximately 2.5 seconds or more.
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Driving support ECU assembly

Does not come on

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Powertrain > Radar Cruise2 > Trouble Codes

Result

Proceed to

DTC U0100, U0125, U0126 and U0129 are not output

A

DTC U0100, U0125, U0126 or U0129 is output

B
A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM