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.

(c) Check for DTCs.

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
A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

    Lost Communication with Front Camera Module (U023A)

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

    See More:

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    Toyota Avalon (XX50) 2019-2022 Owners Manual

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

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