Toyota Yaris: Vehicle Stability Control System / Control Module Communication Bus "B" Off Bus Off (U007488,U010087,U010187,U012587,U012687,U015187)

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Control Module Communication Bus "B" Off Bus Off (U007488,U010087,U010187,U012587,U012687,U015187)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM, steering sensor and airbag sensor assembly via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U007488	Control Module Communication Bus "B" Off Bus Off	Any of the following is detected: A bus OFF state occurs once or more within 0.1 seconds, 10 times in succession. When the +BS terminal voltage is between 9.5 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor (airbag sensor assembly) and steering sensor continues for 1 second or more. When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds: A delay in receiving data from the yaw rate and acceleration sensor (airbag sensor assembly) and steering sensor occurs once or more within 5 seconds.	CAN communication system	Brake
U010087	Lost Communication with ECM/PCM "A" Missing Message	When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the ECM for 2 seconds or more.	CAN communication system ECM Skid control ECU (brake actuator assembly)	Brake
U010187	Lost Communication with TCM Missing Message	When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 15 km/h (9 mph), data cannot be received from the ECM for 2 seconds or more.	CAN communication system ECM Skid control ECU (brake actuator assembly)	Brake
U012587	Lost Communication with Multi-axis Acceleration Sensor Module Missing Message	Either of the following is detected: When the +BS terminal voltage is between 9.5 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more. When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds: Data from the acceleration sensor cannot be received once or more within 5 seconds.	CAN communication system Acceleration sensor (airbag sensor assembly) Skid control ECU (brake actuator assembly)	Brake
U012687	Lost Communication with Steering Angle Sensor Module Missing Message	Either of the following is detected: When the +BS terminal voltage is between 9.5 and 17.4 V, data from the steering sensor cannot be received for 1 second or more. When the +BS terminal voltage is between 9.5 and 17.4 V, the following occurs 10 times in succession within 60 seconds: Data from the steering sensor cannot be received once or more within 5 seconds	CAN communication system Steering sensor Skid control ECU (brake actuator assembly)	Brake
U015187	Lost Communication with Restraints Control Module Missing Message	When the +BS terminal voltage is between 9.5 and 17.4 V and the vehicle speed exceeds 7 km/h (4 mph), data cannot be received from the airbag sensor assembly for 5 seconds or more.	CAN communication system Airbag sensor assembly Skid control ECU (brake actuator assembly)	Brake

PROCEDURE

CLEAR DTC

(a) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(b) Press the DTC clear button.

2.	RECONFIRM DTC

(a) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

Result	Proceed to
Any CAN communication system relating DTCs are output	A
None of the above conditions are met	B

HINT:

If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for VSC system) after the CAN communication system returns to normal.

Click here

INSPECT CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

Brake Switch "A" Circuit Open (P057113)

DESCRIPTION The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch...

ABS Warning Light Remains ON

DESCRIPTION This procedure is for troubleshooting when the ABS warning light remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the ABS warning light in the combination meter assembly via CAN communication...

Other information:

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual: Installation

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Toyota Yaris XP210 (2020-2023) Reapir and Service Manual: Brake System Control Module "A" System Voltage System Voltage Low (C137BA2)

DESCRIPTION If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation. This DTC is stored when the +BS terminal voltage meets one of the DTC detection conditions due to a malfunction in the power supply or charging circuit such as the auxiliary battery or alternator circuit, etc...