Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131
Vehicle Stability Control System (For Sedan) -- 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 VSC system failure.
The brake actuator assembly turns off each solenoid and the ECM shuts off VSC control (traction control signal) from the skid control ECU accordingly, which turns out to be as if the ABS, TRAC and VSC systems were not installed.
The ABS control will be prohibited, but EBD control will continue as much as possible. If EBD control is impossible, the brake warning light will come on to warn the driver (YARIS_NCP93 RM000000XHP0BCX.html). - If system components have any malfunctions before starting control, immediately stop the operation. If system components have any malfunctions during control, gradually stop the control so as not to trigger a sudden change in vehicle conditions.
If it is impossible to control the systems, the warning light comes on to inform the driver of termination of the systems (YARIS_NCP93 RM000000XHP0BCX.html).
- HINT:
- If the brake booster encounters a malfunction, brake performance is gradually lost and ABS, BA, TRAC and VSC systems are prohibited.
| Malfunction Area | Control Method |
| ABS system | ABS, BA, TRAC and VSC control prohibited |
| BA system | ABS, BA, TRAC and VSC control prohibited |
| EBD system | ABS, EBD, BA, TRAC and VSC control prohibited |
- HINT:
- A malfunction in either the ABS or BA system will result in an identical operation, with ABS, BA, TRAC and VSC system control prohibited.
| Malfunction Area | Control Method |
| Engine control system (TRAC and VSC systems) | Disables control depending on malfunction status |
| Brake control system (TRAC and VSC systems) | Disable control |
- HINT:
- As for the TRAC and VSC systems, different systems prohibit different controls depending on the malfunctioning part.