Vehicle Stability Control System Fail-Safe Chart

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

  1. FAIL SAFE OPERATION

Vehicle Stability Control System -- Fail-Safe Chart



FAIL SAFE OPERATION
  1. 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, TR(A)C 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 (COROLLA_ZRE142 RM000000XHP0EKX.html).
  2. 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 (COROLLA_ZRE142 RM000000XHP0EKX.html).

ABS, EBD and BA System
Malfunctioning Area
Control Method
ABS system
ABS, BA, TR(A)C and VSC control prohibited
BA system
ABS, BA, TR(A)C and VSC control prohibited
EBD system
ABS, EBD, BA, TR(A)C and VSC control prohibited
HINT:
A malfunction in either the ABS or BA system will result in identical operation with ABS, BA, TR(A)C and VSC system control being prohibited.

TR(A)C and VSC System
Malfunctioning Area
Control Method
Engine control system
(TR(A)C and VSC systems)
Before control: Disables control
During control: Uses only the brakes to effect control
Brake control system
(VSC system)
Before control: Disables control
During control: Uses only the engine to effect control
Brake control system
(TR(A)C system)
Before control: Disables control
During control: Disables control (by gradually ending control)
HINT:
As for the TR(A)C and VSC systems, different systems prohibit different controls depending on the malfunctioning part.