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Home >> Lexus >> 2018 >> IS 350 Base, AWD >> Repair and Diagnosis >> Steering >> Manual Steering >> Power Steering System - Diagnostics - Introduction >> Power Steering System >> System Description [10/2016 - 09/2020] >> System Description [10/2016 - 09/2020]
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System Description [10/2016 - 09/2020]

  1. DESCRIPTION 
    1. The power steering ECU assembly determines the direction and the amount of assist power in accordance with vehicle speed signals and signals from the torque sensor built into the power steering link assembly. As a result, the power steering ECU assembly adjusts the steering effort so that it is lighter during low speed driving and heavier during high speed driving.
  2. FUNCTIONS OF COMPONENTS 
    Component Function
    Steering Angle Sensor Detects the steering direction and angle of the steering wheel assembly.
    Speed Sensor Detects wheel speeds.
    Drive Mode Select Switch (Combination Switch Assembly) Switches the driving mode.
    Power Steering Link Assembly Torque Sensor Converts the twist of the steering torsion bar into an electrical signal and sends it to the power steering ECU assembly.
    Motor Rotation Angle Sensor Transmits the rotation angle of the power steering motor to the power steering ECU assembly.
    Power Steering Motor Generates power assist in accordance with the actuation current received from the power steering ECU assembly.
    Reduction Mechanism Reduces the speed of the motor and transmits the rotation of the motor to the rack shaft.
    Power Steering ECU Assembly
    • Actuates the power steering motor to provide power assist based on the signals received from various sensors and ECUs.
    • Outputs a warning signal to the combination meter assembly when the power steering ECU assembly detects a power steering system malfunction.
    Air Conditioning Amplifier Assembly Receives a signal from the power steering ECU assembly to limit electrical usage.
    Skid Control ECU (Brake Actuator Assembly)
    • Outputs the vehicle speed signal.
    • Requests steering torque assist during cooperative control.
    AVS ECU (Absorber Control ECU) (w/ Adaptive Variable Suspension System) Transmits the drive mode select signal to the power steering ECU assembly.
    ECM
    • Outputs the engine speed.
    • Outputs the drive mode select signal.
    Combination Meter Assembly EPS Warning Light Illuminates to alert the driver when the power steering ECU assembly detects a malfunction in the power steering system.
    Multi-information Display Displays the warning message to inform the driver of a malfunction in the system.
    Master Warning Light Illuminates when the warning message is displayed on the multi-information display.
    Multi Buzzer Sounds to warn the driver of a malfunction in the system.
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