Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fail-Safe Chart
- FAIL-SAFE OPERATION
- When trouble occurs in the brake control system, the skid control ECU turns the warning lights on, displays a DTC corresponding to the malfunctioning systems on the multi-information display, and prohibits ABS, BA, TR(A)C and VSC operations.
- The skid control ECU prevents operation of a malfunctioning hydraulic pressure system and continues brake control with the normal hydraulic pressure system.
HINT:
- If control of the electronically controlled brake system for any of the 4 wheels is prohibited, that wheel loses brake booster function or braking ability.
- If one of the 4 wheels loses brake booster function, the feeling when depressing the brake pedal changes as the stroke simulator (pedal reactive force generating solenoid) operation will be prohibited.
- If control of the electronically controlled brake system for all wheels is prohibited, the 2 front wheels will lose brake booster function.
ABS, EBP and BA system:
FAIL-SAFE CHART - ABS, EBP AND BA SYSTEMMalfunction 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 TR(A)C and VSC system:
FAIL-SAFE CHART - TR(A)C AND VSC SYSTEMMalfunction Area Control Method Engine control system (TR(A)C and VSC systems) Before control: Disables control
During control: Uses only the brakes to effect controlBrake control system (TR(A)C and VSC systems) 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 a malfunctioning part.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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