VEHICLE STABILITY CONTROL SYSTEM FAIL-SAFE CHART


  1. FAIL SAFE OPERATION


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

      The brake actuator turns off the solenoids and the ECM stops its VSC 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 (red indicator) will come on to warn the driver Click here.

    • If a VSC system component malfunctions before VSC begins, VSC will be prohibited. If a system component malfunctions while VSC is operating, the system will gradually stop operating so as not to trigger a sudden change in vehicle stability.

      If it is impossible to control the systems, the warning light will come on to inform the driver of system control termination Click here.

    • VSC control continues as much as possible while the TRC OFF indicator light is on even when the engine has failed.

    Tech Tips

    For vehicles with the multi-information display, the master warning light will come on and a warning message will be displayed on the multi-information display if the EBD system, BA system, or TRC system is malfunctioning or if ABS control or VSC cannot be performed.

    ABS, EBD and BA System
    Malfunctioning Area Control Method
    ABS system ABS, BA, TRC, VSC control prohibited
    BA system ABS, BA, TRC, VSC control prohibited
    EBD system ABS, EBD, BA, TRC, VSC control prohibited

    Tech Tips

    A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, TRC, VSC system control being prohibited.

    TRC and VSC System
    Malfunctioning Area Control Method
    Engine control system

    Before control starts: Control is disabled.

    During control: Control is disabled (VSC is enabled).

    Brake control system

    (VSC system)

    Before control starts: Control is disabled.

    During control: Control is disabled.

    Brake control system

    (TRC system)

    Before control starts: Control is disabled.

    During control: Control is gradually disabled.

    Tech Tips

    The TRC and VSC systems use different systems to prohibit different controls depending on the malfunctioning parts.