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.
AYC Function, Oversteering
Oversteering, which is when the vehicle turns to a greater degree than the steering wheel has been turned, is an extremely dangerous situation that is hard for the average driver to control. If not remedied, oversteering can cause the vehicle to start spinning out of control.
In the example above, the vehicle makes a right-hand turn and oversteers. To counteract the oversteering, the DSTC/ESC system closed the SV valve (separation valve), opened the ESV valve (Electronic Shuttle Valve) and started the pump. Intake valve (C1) remains open while the other intake valves are closed. As a result, the brakes are applied to the left front and rear wheels. In the event of oversteering, the Brake Control Module (BCM) sends a request for torque reduction to the Engine Control Module (ECM) via CAN.
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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.