Fail-Safe Chart

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

1. 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 turns off each solenoid and the ECM shuts off VSC control (traction control signal) from the skid control ECU. As a result, it is as if the ABS, TRAC and VSC systems are not installed in the vehicle.

* The ABS control will be prohibited, but EBD control continues as much as possible. If EBD control is impossible, the BRAKE warning light comes on to warn the driver 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 the termination of the systems Diagnosis System.

HINT
* If the ABS, BA, TRAC, VSC and AUTO LSD systems encounter a malfunction, the brake system will operate normally without ABS, BA, TRAC, VSC and AUTO LSD control.
* If there is a problem with the brake actuator, brake performance will gradually decrease and control of the ABS, BA, TRAC, VSC and AUTO LSD systems will be prohibited.
(a) ABS, EBD and BA system:





(b) TRAC, VSC and AUTO LSD system:

HINT
As for the TRAC, VSC and AUTO LSD systems, different systems prohibit different controls according to the malfunctioning part.





2. SYSTEM TEMPERATURE PROTECTION OPERATION

If the TRAC or AUTO LSD system has been used constantly for a long time, the temperature of the brake pads may excessively increase. If the temperature excessively increases, the skid control buzzer will sound intermittently. If the temperature increases even more, the skid control buzzer sounds for 3 seconds intermittently and the indicator light either comes on.





HINT
If the SLIP indicator light goes off, the systems automatically return to normal operating conditions. As this is not a malfunction, no DTC will be recorded.