Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Description

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Steering / Power Assist Systems / Power Steering System(for Gasoline Model) / System Description

SYSTEM DESCRIPTION

DESCRIPTION

(a) The power steering ECU (rack and pinion power steering gear assembly) generates the necessary steering assist torque by calculating the steering assist force and controlling the motor current, based on the steering torque information from the torque sensor (rack and pinion power steering gear assembly), vehicle speed information from the skid control ECU (brake actuator assembly), and information from the ECUs.

(b) When there is a drop in the power source voltage, the rear window defogger, windshield deicer, outer mirror heater, PTC heater and seat heater operations are limited as part of power steering system load control.

(c) When there is a drop in the power source that may require an increase in steering force, the system illuminates the power steering warning light in order to warn the driver.

Function of Components:

Component

Function
*: w/ Adaptive Variable Suspension System

Rack and Pinion Power Steering Gear Assembly

HINT:

The components listed on the right are built-in

Power Steering ECU
  • Calculates the motor operation current based on the steering torque and vehicle speed signals, and outputs it to the motor.
  • When a malfunction is detected in the power steering system, it outputs a warning signal to the combination meter assembly.

Power Steering Motor
  • Generates power assist in accordance with the actuation current received from the power steering ECU.
  • The built-in motor rotation angle sensor detects the rotation angle of the motor.

Torque Sensor

Detects the steering torque.

Reduction Mechanism

Decelerates the motor rotation torque and transmits it to the rack shaft.

Steering Sensor

Detects the steering angle and steering direction.

Skid Control ECU (Brake Actuator Assembly)

Sends the vehicle speed signal and steering coordinated control amount signal to the rack and pinion power steering gear assembly.

ECM
  • Outputs the engine speed.
  • Outputs the drive mode select signal.

Air Conditioning Amplifier Assembly

Receives a signal from the power steering ECU (rack and pinion power steering gear assembly) to limit electrical usage.

AVS ECU (Absorber Control ECU)*

Transmits the drive mode select signal to the power steering ECU assembly.

Combination Meter Assembly

EPS Warning Light

Illuminates to alert the driver when the power steering ECU (rack and pinion power steering gear assembly) detects a malfunction in the power steering system.

Multi-information Display

Displays a warning message to inform the driver of a malfunction in the system.

Master Warning Light

Illuminates when a warning message is displayed on the multi-information display.

Multi Buzzer

Sounds to warn the driver of a malfunction in the system.

Forward Recognition Camera

Requests steering assist torque when the lane departure alert system judges that the vehicle is departing from its lane.

Drive Mode Select Switch (Electric Parking Brake Switch Assembly)

Switches the driving mode.
    Problem Symptoms Table

    System Diagram

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    Toyota Avalon (XX50) 2019-2022 Owners Manual

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