Electronic Power Steering System - Diagnosis System

Connecting the intelligent tester to the vehicle and reading various data output from the power steering ECU assembly is the only difference between usual troubleshooting procedures and those for a vehicle with a diagnostic system.


The power steering ECU assembly records DTCs when the ECU detects a malfunction in the computer itself or in its circuits.

Electronic Power Steering System - System Description

The EPS 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 to be light during low speed driving and moderately high during high speed driving.

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