Traction Control System: Description
Lexus Traction Control System (TRAC) controls engine torque and braking of driving wheels. TRAC is available as an option on rear wheel drive vehicles. TRAC system consists of sub-throttle actuator, accumulator, pump, wheel speed sensors, ABS ECU, TRAC ECU, relays, solenoids, motor relay, TRAC cut switch, light indicator and warning switch. See Fig 1.
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.