Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with TCM (U0101,U0123,U0126,U0129,U0131,U0142,U0155,U0293)

DESCRIPTION

When a malfunction is detected between various ECUs and sensors, these DTCs are stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0101

Lost Communication with TCM

2 seconds after the power switch is turned on (IG), while the vehicle is being driven at 1 km/h or 1 mph or more, a communication error between the TCM (hybrid vehicle control ECU) and the forward recognition camera is detected for approximately 5 seconds or more.

CAN communication system

U0123

Lost Communication with Yaw Rate Sensor Module

2 seconds after the power switch is turned on (IG), while the vehicle is being driven at 1 km/h or 1 mph or more, a communication error between the yaw rate sensor (airbag ECU assembly) and the forward recognition camera is detected for approximately 5 seconds or more.

CAN communication system

U0126

Lost Communication with Steering Angle Sensor Module

2 seconds after the power switch is turned on (IG), a communication error between the steering sensor and the forward recognition camera is detected for approximately 5 seconds or more.

CAN communication system

U0129

Lost Communication with Brake System Control Module

2 seconds after the power switch is turned on (IG), a communication error between the skid control ECU (brake booster with master cylinder assembly) and the forward recognition camera is detected for approximately 5 seconds or more.

CAN communication system

U0131

Lost Communication with Power Steering Control Module

2 seconds after the power switch is turned on (IG), a communication error between the power steering ECU (rack and pinion power steering gear assembly) and the forward recognition camera is detected for approximately 5 seconds or more.

CAN communication system

U0142

Lost Communication with Body Control Module "B"

2 seconds after the power switch is turned on (IG), a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more.

CAN communication system

U0155

Lost Communication with Combination Meter

2 seconds after the power switch is turned on (IG), a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more.

CAN communication system

U0293

Lost Communication with HV ECU

2 seconds after the power switch is turned on (IG), a communication error between the hybrid vehicle control ECU and the forward recognition camera is detected for approximately 5 seconds.

CAN communication system

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Chassis > LKA/LDA > 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.

Chassis > LKA/LDA > Trouble Codes

Result

Proceed to

DTC U0101, U0123, U0126, U0129, U0131, U0142, U0155 and U0293 are not output

A

DTC U0101, U0123, U0126, U0129, U0131, U0142, U0155 or U0293 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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