Fail-Safe Chart

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): FAIL-SAFE CHART

1. FAIL SAFE OPERATION

* If there is a problem with any sensor signals or hydraulic brake booster systems, the skid control ECU prohibits the power supply to the actuator in the hydraulic brake booster and informs the ECM of VSC system failure.

* The hydraulic brake booster turns off each solenoid and the ECM shuts off the 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 is prohibited, but EBD control continues as far as possible. If EBD control is impossible, the BRAKE warning light comes on to warn the driver Diagnosis System.

* 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 the termination of the systems Diagnosis System.

HINT
* If the ABS, BA, TRAC, A-TRAC, VSC and AUTO LSD systems malfunction, the brake system will operate normally without ABS, BA, TRAC, VSC and AUTO LSD controls.
* If the hydraulic brake booster malfunctions, gradual loss of brake performance is expected, and ABS, BA, TRAC, A-TRAC, VSC and AUTO LSD system controls are prohibited.
(a) ABS & EBD & BA system:

HINT
If the ABS, BA or EBD system malfunctions, the following controls are prohibited as shown in the table below.





(b) TRAC & A-TRAC & VSC & AUTO LSD system:

HINT
If TRAC, A-TRAC, VSC and/or AUTO LSD malfunction, the following controls are prohibited as shown in the table below.





2. SYSTEM TEMPERATURE PROTECTION OPERATION

If TRAC, A-TRAC, AUTO LSD, or Hill-Start Assist Control system has been used constantly for a long time, the temperature of the hydraulic brake booster, may increase excessively. If the temperature increases excessively, the skid control (VSC warning) buzzer sounds intermittently. If the temperature increases more, the skid control (VSC warning) buzzer sounds for 3 seconds repeatedly and the indicator light either comes on or blinks.