Fail-Safe Chart
- FAIL SAFE OPERATION
- If there is a problem with sensor signals or the brake actuator system, the skid control ECU prohibits power supply to the brake actuator and informs the ECM of the VSC system malfunction.
The brake actuator 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, TRAC 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 (See DIAGNOSIS SYSTEM ).
- 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 the control so as not to trigger a sudden change in vehicle operation.
If it is impossible to control the systems, the warning light will come on to inform the driver of system control termination (See DIAGNOSIS SYSTEM ).
ABS, EBD and BA System
ABS, EBD AND BA SYSTEM MALFUNCTION REFERENCE CHARTMalfunctioning 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 identical operation with ABS, BA, TRAC and VSC system control being prohibited.
TRAC and VSC System
TRAC AND VSC SYSTEM MALFUNCTION REFERENCE CHARTMalfunctioning Area Control Method Engine control system (TRAC and VSC systems) Before control: Disables control
During control: Uses only the brakes to effect controlBrake control system (VSC system) Before control: Disables control
During control: Uses only the engine to effect controlBrake control system (TRAC system) Before control: Disables control
During control: Disables control (by gradually ending control)HINT:
As for the TRAC and VSC systems, different systems prohibit different controls depending on the malfunctioning part.
- If there is a problem with sensor signals or the brake actuator system, the skid control ECU prohibits power supply to the brake actuator and informs the ECM of the VSC system malfunction.