Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AU7F
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: U0100-U0122,U0124,U0126; Lost Communication With ECM/PCM "A"; 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]

DTC

U0100

Lost Communication With ECM/PCM "A"

DTC

U0101

Lost Communication with TCM

DTC

U0122

Lost Communication With Vehicle Dynamics Control Module

DTC

U0124

Lost Communication with Lateral Acceleration Sensor Module

DTC

U0126

Lost Communication with Steering Angle Sensor Module

DESCRIPTION

The absorber control ECU receives signals from the ECM, skid control ECU (brake actuator assembly), airbag ECU assembly and steering sensor via CAN communication.

When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

U0100

Lost Communication With ECM/PCM "A"

While driving at 30 km/h (19 mph) or more, data is not received via CAN communication for 3 seconds or more.
  • ECM
  • CAN communication system
  • Absorber control ECU

Does not come on

Yes

U0101

Lost Communication with TCM

While driving at 30 km/h (19 mph) or more, data is not received via CAN communication for 6 seconds or more.
  • ECM
  • CAN communication system
  • Absorber control ECU

Does not come on

Yes

U0122

Lost Communication With Vehicle Dynamics Control Module

Data is not received from the skid control ECU (brake actuator assembly) via CAN communication for 3 seconds or more.
  • Skid control ECU (brake actuator assembly)
  • CAN communication system
  • Absorber control ECU

Does not come on

Yes

U0124

Lost Communication with Lateral Acceleration Sensor Module

Data is not received from the airbag ECU assembly via CAN communication for 3 seconds or more.
  • Airbag ECU assembly
  • CAN communication system
  • Absorber control ECU

Does not come on

Yes

U0126

Lost Communication with Steering Angle Sensor Module

Data is not received from the steering sensor via CAN communication for 3 seconds or more.
  • Steering sensor
  • CAN communication system
  • Absorber control ECU

Does not come on

Yes

CAUTION / NOTICE / HINT

NOTICE:

  • Before performing troubleshooting, inspect the connectors of related circuits.
  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: C1782; Low Battery Positive Voltage

  • Before replacing the absorber control ECU, perform all of the following:
    • Symptom simulation.

      Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

    • DTC inspection.

      Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DTC CHECK / CLEAR

    • Techstream inspection.

      Click here 2019 MY Avalon Avalon HV [04/2018 - 08/2019]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DATA LIST / ACTIVE TEST 2020 - 2022 MY Avalon Avalon HV [08/2019 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DATA LIST / ACTIVE TEST

      • If no malfunctions are found in other areas, replace the absorber control ECU.
  • After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: TEST MODE PROCEDURE

PROCEDURE

1.

CHECK FOR DTCS

(a) Clear the DTCs.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DTC CHECK / CLEAR

Chassis > Air suspension > Clear DTCs

(b) Turn the engine switch off.

(c) Drive the vehicle at a speed of 30 km/h (19 mph) or more for 10 seconds or more.

(d) Check for DTCs.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; SUSPENSION CONTROL: ADAPTIVE VARIABLE SUSPENSION SYSTEM: DTC CHECK / CLEAR

Chassis > Air suspension > Trouble Codes

Result

Proceed to

CAN DTCs are not output

A

CAN DTCs are output

B

HINT:

If a CAN communication malfunction DTC and a related sensor malfunction DTC are output at the same time, the CAN communication malfunction must be repaired before troubleshooting the sensor.

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)