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.
System Description
- DESCRIPTION
- The electric power steering system generates assist torque to assist steering effort through the operation of the motor installed on the power steering gear assembly.
The direction and amount of power assistance are determined by signals from the torque sensor, and controlled in accordance with vehicle speed. As a result, steering effort is controlled so that it is light during low speed driving and moderately high during high speed driving.
- The electric power steering system generates assist torque to assist steering effort through the operation of the motor installed on the power steering gear assembly.
- FUNCTIONS OF COMPONENTS FUNCTIONS OF COMPONENTS
Components Function Power Steering ECU Calculates degree of assistance needed based on steering torque and vehicle speed. Drives the motor based on motor rotation angle obtained from the motor rotation angle sensor. Restricts power assistance to protect the system if the motor and ECU overheat. Power Steering Converter Assembly Boosts battery voltage to generate motor drive voltage. Torque Sensor Detect steering effort generated when the steering wheel is turned. Power Steering Motor Located coaxially with the rack shaft. Its rotation is converted to the rectilinear motion of the steering rack via the ball screw nut and ball. Motor Rotation Angle Sensor Detects motor rotation angle. Combination Meter (PS Warning Light) Upon receiving a signal from the power steering ECU in the event of a system malfunction, the meter ECU illuminates the PS warning light. Skid Control ECU Transmits speed sensor signals to the power steering ECU. ECM Transmits engine speed signals to the power steering ECU. - OPERATION EXPLANATION
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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.