FAIL-SAFE OPERATION
If there is a problem with sensor signals or brake actuator systems, the skid control ECU (brake actuator assembly) prohibits power supply to the brake actuator assembly and informs the ECM of VSC system failure.
The brake actuator assembly turns off each solenoid and the ECM stops its VSC (traction control signal), which is based on signals from the skid control ECU (brake actuator assembly). The vehicle operates 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 is possible. If EBD control is impossible, the brake warning light will come on to warn the driver.
If a system component has any malfunction before control begins, operation is prohibited. If a system component has any malfunction during control, the system will gradually stop operating so as not to trigger a sudden change in vehicle conditions.
If it is impossible to control the systems, the warning/indicator lights come on to inform the driver of system control termination Click here.
Tech Tips
If the brake booster encounters a malfunction, brake performance is gradually lost and the ABS, BA, TRC and VSC systems are prohibited.
| Malfunctioning Area | Control Method |
|---|---|
| ABS | ABS, BA, TRC and VSC system prohibited |
| BA system | ABS, BA, TRC and VSC system prohibited |
| EBD system | ABS, EBD, BA and TRC system prohibited |
Tech Tips
A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, TRC and VSC system control prohibited.
| Malfunctioning Area | Control Method |
|---|---|
| Engine control system (TRC and VSC systems) |
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 stopping control) |
Tech Tips
The TRC and VSC systems use different systems to prohibit different controls depending on the malfunctioning parts.