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 malfunction.
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 (See DIAGNOSIS SYSTEM ).
- If system components have any malfunction before starting control, immediately stop the operation. If system components have any malfunction 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 (See DIAGNOSIS SYSTEM ).
ABS, EBP and BA System
ABS, EBP AND BA SYSTEM FAIL SAFE CHARTMalfunction 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.
TRAC and VSC System
TRAC AND VSC SYSTEM FAIL SAFE CHARTMalfunction 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 a malfunctioning part.
- 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 malfunction.