Toyota Yaris: Vehicle Stability Control System / Fail-safe Chart

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE OPERATION

  • If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator assembly and informs the ECM of an VSC system malfunction.

    The brake actuator assembly turns off the solenoids and the ECM stops its VSC control according to signals from the skid control ECU. The vehicle will operate in a manner similar to a vehicle that is not equipped with ABS, TRC and VSC systems.

    ABS control will be prohibited, but EBD control will continue to the extent that EBD control is possible. If EBD control is impossible, the brake system warning light will come on to warn the driver.

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  • If an VSC system component malfunctions before VSC control begins, VSC control will be prohibited. If a system component malfunctions during VSC control, the system will gradually stop performing control so as not to trigger a sudden change in vehicle operation.

    If it is impossible for control to continue, the warning light comes on to inform the driver of system control termination.

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  • If the skid control ECU (brake actuator assembly) detects a malfunction in the SRS system, secondary collision brake control is prohibited to prevent undesired operation and to protect the system.

    HINT:

    When control is prohibited, a message is displayed on the multi-information display in the combination meter assembly.

ABS, EBD and BA Systems

Malfunction Area

Control Method

ABS system

ABS, BA, TRC and VSC control prohibited.

BA system

ABS, BA, TRC and VSC control prohibited.

EBD system

ABS, EBD, BA, TRC and VSC control prohibited.

TRC and VSC Systems

Malfunction Area

Control Method

Engine control system

(TRC system)

Before control: Disables control.

During control: Uses only the brakes to perform control.

Brake control system

(VSC system)

Before control: Disables control.

During control: Uses only the engine to perform control.

Brake control system

(TRC system)

Before control: Disables control.

During control: Disables control (by gradually ending control).

Secondary Collision Brake System

Malfunction Area

Control Method

Airbag system

(Secondary collision brake system)

Before control: Disables control.

During control: Uses only the brakes to perform control.

Engine control system

(Secondary collision brake system)

Before control: Disables control.

During control: Uses only the brakes to perform control.

    Freeze Frame Data

    FREEZE FRAME DATA FREEZE FRAME DATA (a) Using the GTS, check the vehicle condition (ECU, sensor) when the brake system operates or a DTC is output. CHECK FREEZE FRAME DATA WHEN DTC WAS STORED HINT: Freeze frame data is stored when a DTC is output...

    Data List / Active Test

    DATA LIST / ACTIVE TEST DATA LIST (BRAKE) NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not...

    Other information:

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Reassembly


    REASSEMBLY CAUTION / NOTICE / HINT HINT: Use the same procedure for the LH side and RH side. The following procedure is for the LH side. PROCEDURE 1. APPLY HIGH TEMPERATURE GREASE (a) Apply high temperature grease to the areas of the parking brake plate which make contact with the shoes as shown in the illustration...

    Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: How To Proceed With Troubleshooting


    CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the wiper and washer system. *: Use the GTS. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT: In troubleshooting, confirm that the problem symptoms have been accurately identified...

    Categories

    Supplemental Restraint System (SRS) Precautions

    The front and side supplemental restraint systems (SRS) include different types of air bags. Please verify the different types of air bags which are equipped on your vehicle by locating the “SRS AIRBAG” location indicators. These indicators are visible in the area where the air bags are installed.

    The air bags are installed in the following locations:

    The steering wheel hub (driver air bag) The front passenger dashboard (front passenger air bag) The outboard sides of the front seatbacks (side air bags) The front and rear window pillars, and the roof edge along both sides (curtain air bags)

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