Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GYWW
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM (for 2ZR-FAE): U0100,U0104,U0122; Lost Communication With ECM/PCM "A"; 2020 - 2022 MY Corolla [01/2019 - 09/2022]

DTC

U0100

Lost Communication With ECM/PCM "A"

DTC

U0104

Lost Communication with Cruise Control Module

DTC

U0122

Lost Communication With Vehicle Dynamics Control Module

DESCRIPTION

The ECM 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

DTC Output from

U0100

Lost Communication With ECM/PCM "A"

When the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake actuator assembly) and ECM is detected for approximately 1 second or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM

Cruise Control

U0104

Lost Communication with Cruise Control Module

When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication malfunction between the millimeter wave radar sensor assembly and ECM is detected for approximately 1 second or more.

  • CAN communication system
  • Millimeter wave radar sensor assembly
  • ECM

Cruise Control

U0122

Lost Communication With Vehicle Dynamics Control Module

When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake actuator assembly) and ECM is detected for approximately 2.6 seconds or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM

Cruise Control

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Cruise Control > 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 > Cruise Control > Trouble Codes

Result

Proceed to

DTC U0100, U0104 and U0122 are not output

A

DTC U0100, U0104 or U0122 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM