Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0155)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Pre-collision / Pre-collision System(for Gasoline Model) / Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0155)

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect objects in front of the vehicle. Based on signals from the millimeter wave radar sensor assembly, the driving support ECU assembly sends pre-collision system control operation signals. These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0100	Lost Communication with ECM / PCM "A"	When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the ECM and the driving support ECU assembly is detected for approximately 5 seconds.	CAN communication system
U0125	Lost Communication with Yaw Rate Sensor Module	When the engine switch is on (IG), a communication error between the yaw rate sensor (airbag ECU assembly) and the driving support ECU assembly is detected for approximately 1 second.	CAN communication system
U0126	Lost Communication with Steering Angle Sensor Module	When the engine switch is on (IG), a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 4 seconds.	CAN communication system
U0129	Lost Communication with Brake System Control Module	When the engine switch is on (IG), a communication error between the skid control ECU (brake actuator assembly) and the driving support ECU assembly is detected for approximately 3 seconds.	CAN communication system
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	When the engine switch is on (IG), a communication error between the combination meter assembly and the driving support ECU assembly is detected for approximately 3 seconds.	CAN communication system

PROCEDURE

1.	CHECK FOR DTCs

(a) Clear the DTCs.

Body Electrical > Pre-Collision 2 > 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.

Body Electrical > Pre-Collision 2 > Trouble Codes

Result	Proceed to
DTC U0100, U0125, U0126, U0129 and U0155 are not output	A
DTC U0100, U0125, U0126, U0129 or U0155 is output	B

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Lost Communication with Front Camera Module (U023A)

Lost Communication with Cruise Control Front Distance Range Sensor (U0235)

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0155)

Lost Communication with Front Camera Module (U023A)

Lost Communication with Cruise Control Front Distance Range Sensor (U0235)

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual