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.
Traction Control System (TCS)
TCS functions by transferring torque from the spinning wheel to wheel with most traction. This is done by applying the brake at the spinning wheel through the Hydraulic Control Unit (HCU) or by reducing throttle opening. Throttle function is controlled by a throttle control unit and 2 cables. One cable is attached to accelerator pedal and throttle control unit. The other cable is attached to throttle control unit and throttle body.
TCS braking and throttle control occur at vehicle speeds up to about 30 MPH. At speeds greater than 30 MPH, only throttle limiting is used. TCS warning light will turn on if TCS has been manually turned off with TCS disable switch, or if there is a TCS fault.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.