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 warning light 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).
For vehicles with the multi-information display, the master caution indicator light will come on and a warning message will be displayed on the multi-information display if any of the EBD system, BA system, or TRC system is malfunctioning or if the ABS control or VSC cannot be performed.
| Malfunctioning Area | Control Method |
|---|---|
| ABS system | ABS, BA, TRC, VSC, downhill assist control (for 4WD) and hill-start assist control prohibited |
| BA system | ABS, BA, TRC, VSC, downhill assist control (for 4WD) and hill-start assist control prohibited |
| EBD system | ABS, EBD, BA, TRC, VSC, downhill assist control (for 4WD) and hill-start assist control prohibited |
A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, TRC, VSC, downhill assist control (for 4WD) and hill-start assist control system control being prohibited.
| Malfunctioning Area | Control Method |
|---|---|
| Engine control system (TRC and VSC systems) |
Before control: Disables control During control: Uses only the brakes to effect control |
| Brake control system (VSC system) |
Before control: Disables control During control: Uses only the engine to effect control |
| Brake control system (TRC, downhill assist control (for 4WD) and hill-start assist control systems) |
Before control: Disables control During control: Disables control (by gradually stopping control) |
The TRC, VSC, downhill assist control (for 4WD) and hill-start assist control systems use different systems to prohibit different controls depending on the malfunctioning parts.
SYSTEM TEMPERATURE PROTECTION OPERATION
If the TRC, downhill assist control (for 4WD) 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 4WD) | Slip indicator light comes on Downhill assist control indicator light blinks |
If the slip indicator light goes off (for the downhill assist control system, the downhill assist control indicator light also comes on (for 4WD)), the systems automatically return to normal operating conditions.
As this is not a malfunction, no DTC will be recorded.