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: Description
Lexus Traction Control System (TRAC) controls engine torque and braking of driving wheels. TRAC is available as an option. TRAC system consists of sub-throttle actuator, accumulator, pump, wheel speed sensors, ABS/TRAC ECU, TRAC ECU or throttle valve motor driver, relays, solenoids, motor relay, TRAC cut switch, light indicator and warning switch. See Fig 1, Fig 2 or Fig 3 .
Integrated with ABS system, TRAC helps avoid slippage of driving wheels during acceleration. System maintains optimal driving control during changing road surface conditions upon acceleration. System eliminates need for acceleration pedal operation and improves vehicle stability when starting, accelerating or turning on slippery roads.
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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.