Heavy steering
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Front tires (improperly inflated, unevenly worn)
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Front wheel alignment (incorrect)
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Front suspension (Lower ball joint)
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Steering gear assembly
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Battery and power source circuit
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*1
*2
*3
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Power source voltage of power steering ECU assembly
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*4
*5
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Power steering ECU with motor assembly
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Vehicle condition (Steering wheel is turned from left to right repeatedly with vehicle stopped or heavy load is continuously applied to vehicle)
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*4
*5
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Steering effort differs between right and left or is uneven
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Rotation angle sensor initialization and torque sensor zero point calibration incomplete
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*4
*5
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Front tires (improperly inflated, unevenly worn)
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Front wheel alignment (incorrect)
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Front suspension (Lower ball joint)
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Steering gear assembly
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Torque sensor (Electric power steering column sub-assembly)
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Electric power steering column sub-assembly
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Power steering ECU with motor assembly
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While driving, steering effort does not change in accordance with vehicle speed, or steering wheel does not return to its centered position easily
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Skid control ECU assembly
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*4
*6
*7
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Speed sensor
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*4
*6
*7
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Torque sensor (Electric power steering column sub-assembly)
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Power steering ECU with motor assembly
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CAN communication system
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*4
*5
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Friction sounds occur when turning steering wheel during low speed driving
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Power steering motor (Power steering ECU with motor assembly)
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Electric power steering column sub-assembly
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Spiral cable with sensor sub-assembly
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Steering column cover contacting steering wheel assembly
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High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped
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Power steering motor (Power steering ECU with motor assembly)
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Steering wheel installation (incorrect)
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Steering wheel vibrates and noise occurs when turning steering wheel from lock to lock
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Power steering motor (Power steering ECU with motor assembly)
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Electric power steering column sub-assembly
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Steering wheel installation (incorrect)
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