Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with ECM / PCM "A" (U0100,U0126,U0129,U0140,U0163,U0233)

DESCRIPTION

These DTCs are stored if there is a malfunction in the CAN communication system connected to the parking assist ECU.
These DTCs are stored if there is a malfunction in the CAN communication system connected to the television camera assembly.

HINT:

If CAN communication system DTCs are stored, they may also be stored in other systems.

Parking Assist ECU

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U0100	Lost Communication with ECM / PCM "A"	Lost Communication with ECM	CAN communication system	Parking assist ECU
U0126	Lost Communication with Steering Angle Sensor Module	Lost communication with steering sensor	CAN communication system	Parking assist ECU
U0129	Lost Communication with Brake System Control Module	Lost communication with skid control ECU	CAN communication system	Parking assist ECU
U0140	Lost Communication with Body Control Module	Lost communication with main body ECU (multiplex network body ECU)	CAN communication system	Parking assist ECU
U0163	Lost Communication with Navigation Control Module	Lost communication with radio and display receiver assembly	CAN communication system	Parking assist ECU
U0233	Lost Communication with Blind Spot Monitor Master Module	Lost communication with blind spot monitor sensor RH	CAN communication system	Parking assist ECU

Television Camera Assembly

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U0100	Lost Communication with ECM / PCM "A"	Lost Communication with ECM	CAN communication system	Television camera assembly
U0126	Lost Communication with Steering Angle Sensor Module	Lost communication with steering sensor	CAN communication system	Television camera assembly
U0129	Lost Communication with Brake System Control Module	Lost communication with skid control ECU	CAN communication system	Television camera assembly
U0140	Lost Communication with Body Control Module	Lost communication with main body ECU (multiplex network body ECU)	CAN communication system	Television camera assembly
U0163	Lost Communication with Navigation Control Module	Lost communication with radio and display receiver assembly	CAN communication system	Television camera assembly
U0233	Lost Communication with Blind Spot Monitor Master Module	Lost communication with blind spot monitor sensor RH	CAN communication system	Television camera assembly

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs.

Chassis > Panoramic View Monitor > Clear DTCs Chassis > Parking Assist Camera > Clear DTCs

(b) Recheck for DTCs and check that no DTCs are output.

Chassis > Panoramic View Monitor > Trouble Codes Chassis > Parking Assist Camera > Trouble Codes

HINT:

If CAN communication system DTCs are stored, they may also be stored in other systems.
If the CAN communication system has been inspected and repaired in other systems, the DTCs will not be output when rechecking for DTCs.
If these DTCs are output frequently, duplicate the conditions that cause the problem symptoms and perform the troubleshooting again, even if the DTC was not output when rechecking for DTCs.
Click here

Result	Proceed to
DTCs are output	A
No DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

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