Fail-Safe Chart

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: FAIL-SAFE CHART

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 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 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 continues as much as possible. If EBD control is impossible, the BRAKE warning light comes on to warn the driver Diagnosis System.
- If a system component has any malfunction before control begins, operation is prohibited. If a system component has any malfunction during control, the system will gradually stop operating 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 Diagnosis System.

HINT: If the hydraulic brake booster encounters a malfunction, brake performance is gradually lost and ABS, BA, TRAC, A-TRAC, VSC, AUTO LSD, downhill assist control and hill-start assist control system control is prohibited.

(a) ABS, EBD and BA system:





(b) TRAC, A-TRAC, VSC, AUTO LSD, downhill assist control and hill-start assist control system:

HINT: For the TRAC, A-TRAC, VSC, AUTO LSD, downhill assist control and hill-start assist control systems, different systems prohibit different controls according to the malfunctioning part.





2. SYSTEM TEMPERATURE PROTECTION OPERATION
If the TRAC, A-TRAC, AUTO LSD, downhill assist control, or hill-start assist control system has been used constantly for a long time, the temperature of the brake actuator, built into the hydraulic brake booster, may excessively increase. If the temperature excessively increases, the skid control buzzer will sound intermittently. If the temperature increases further, the skid control buzzer sounds for 3 seconds and the indicator light either comes on or blinks.





HINT:
- If the SLIP indicator light goes off (for the downhill assist control system, the downhill assist control indicator light also comes on), the systems automatically return to normal operating conditions.
- If the AUTO LSD indicator light goes off, the systems automatically return to normal operating conditions.
- As this is not a malfunction, no DTC will be recorded.