VEHICLE STABILITY CONTROL SYSTEM FAIL-SAFE CHART


  1. 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 a 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 warning light will come on to warn the driver.

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    • If a 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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    ABS, EBD and BA System
    Item Operation
    Malfunction in the ABS. ABS, BA, TRC, VSC, downhill assist control (for AWD) and hill-start assist control prohibited.
    Malfunction in the BA system. ABS, BA, TRC, VSC, downhill assist control (for AWD) and hill-start assist control prohibited.
    Malfunction in the EBD system. ABS, EBD, BA, TRC, VSC, downhill assist control (for AWD) and hill-start assist control prohibited.

    Tech Tips

    A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, TRC, VSC, downhill assist control (for AWD) and hill-start assist control systems control being prohibited.

    TRC and VSC System
    Item Operation
    Malfunction in the engine control system (TRC and VSC systems).

    Before control: Disables control.

    During control: Uses only the brakes to perform control.
    Malfunction in the brake control system (VSC system).

    Before control: Disables control.

    During control: Uses only the engine to perform control.
    Malfunction in the brake control system (TRC, downhill assist control (for AWD) and hill-start assist control systems).

    Before control: Disables control.

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

    Tech Tips

    The TRC, VSC, downhill assist control (for AWD) and hill-start assist control systems to prohibit different controls depending on the malfunctioning parts.

  2. SYSTEM TEMPERATURE PROTECTION OPERATION

    If the TRC, downhill assist control (for AWD) or hill-start assist control system has been used constantly for a long time, the temperature of the brake actuator may increase excessively. If the temperature increases to a certain point, the meter buzzer will sound intermittently. If the temperature further increases, the meter buzzer sounds and the indicator light either comes on or blinks.

    System Indicator Condition
    TRC and hill-start assist control systems Slip indicator light comes on.
    Downhill assist control system (for AWD)

    Slip indicator light comes on.

    Downhill assist control indicator light blinks.

    Tech Tips


    • If the slip indicator light goes off (for the downhill assist control system, the downhill assist control indicator light also comes on (for AWD)), the systems automatically return to normal operating conditions.

    • As this is not a malfunction, no DTC will be stored.