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 function
Monitors and controls wheel spin in the driving wheels at lower speeds in order to increase forward movement. If a wheel starts to spin that wheel is automatically braked so that the drive power is transferred to the other wheel. Activated only at speeds up to approximately 40 km/h (25 mph). When the traction control has been activated it can be used up to 80 km/h (50 mph). Traction control can be likened to an electronic limited slip differential.
Traction control is always connected after starting but can be deactivated using a switch. If the driver depresses the brake when the system is operating the function is deactivated.
The control module monitors how hard the traction control is working and calculates theoretical brake temperature. If there is a risk of the brakes overheating the function is deactivated. At the same time the warning lamp and a diagnostic trouble code is stored. When the brakes have cooled the warning lamp goes out and the function is reactivated, but the diagnostic trouble code (DTC) is still stored in the memory.
In cars with Traction control the ABS hydraulic modulator contains the following components: hydraulic valve (1), solenoid valve (2), and a by-pass valve (3), 2 of each, 1 per circuit.
There is a central valve in the hydraulic cylinder primary cylinder. The valve is normally open and ensures that the pump receives sufficient brake fluid during traction control (TC) operation.
The function is similar to the TRACS in the X70.
Use the Manual With the Right Hardware
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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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