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.
2002 Mazda 626 ES, AutomaticFACTORY OEM SERVICE PROCEDURE
Traction Control System: Outline
- The traction control system (TCS) is a system that controls engine output in accordance with road surface and vehicle travel conditions, so that the driving force stays within the friction limits. By doing this, it improves start/acceleration performance and safety.
- In general, the tire's driving force reaches its maximum at a certain slip ratio, and then decreases as the slip ratio increases. To determine the slip ratio, the TCS takes the driven wheel speed as the vehicle speed, and compares this speed with the drive wheel speed.
- During straight travel, the TCS controls engine output so that the slip ratio is near the value where maximum driving force is obtained. And during turning, the TCS deduces the turn radius from driven wheel inner/outer speed difference, and controls the slip ratio to a value lower than that during straight travel, to provide sufficient lateral force. In this way, TCS improves driving stability.
Factory Service Tools
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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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