Fail-Safe Chart
WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
- FAIL SAFE OPERATION
- If there is a problem with any sensor signals or actuator systems, the skid control ECU prohibits the power supply to the ABS and TRACTION actuator and informs the ECM of VSC system failure.
The ABS and TRACTION actuator turns off the solenoids and the ECM shuts off VSC control (traction control signal) from the skid control ECU accordingly, the result being that it is as if the ABS, TRAC and VSC systems were not installed.
- 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 (see DIAGNOSIS SYSTEM ).
- If system components have any malfunctions before starting control, the operation stops immediately. If system components have any malfunctions during control, the control stops gradually 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 malfunctions in the systems (see DIAGNOSIS SYSTEM ).
HINT:
- If the ABS system malfunctions, the brake system operates normally without the ABS system.
- If the brake actuator malfunctions, a gradual loss of brake performance is expected, and ABS system control is prohibited.
ABS, EBP and BA system
MALFUNCTION AREA AND FAIL-SAFE OPERATIONMalfunction Area Fail-Safe Operation 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 TRAC and VSC system:
FAIL-SAFE OPERATION AND MALFUNCTION AREAMalfunction Area Fail-Safe Operation 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) - If there is a problem with any sensor signals or actuator systems, the skid control ECU prohibits the power supply to the ABS and TRACTION actuator and informs the ECM of VSC system failure.