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

Last Modified: 07-31-2024	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

1.	CHECK FOR DTCs

(a) Clear the 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.

Result	Proceed to
DTC U0100, U0104 and U0122 are not output	A
DTC U0100, U0104 or U0122 is output	B