Description

The EPS (Electric Power Steering) system uses an electric motor to assist steering effort, and is an independent steering system that does not rely on the engine. The EPS control module controls the motor operation according to information received from each sensor and CAN (Controller Area Network), which provides more precise and timely steering assist control than traditional engine-driven hydraulic systems. The EPS system components (steering angle sensor, torque sensor, fail-safe relay, etc.) are located inside the steering column. The EPS module, steering column and EPS unit must not be disassembled for inspection. If necessary, they must be replaced. Note on Diagnostics

Problem Factor	Check Item	Symptom of Malfunction	Description	NOTE
Drop, Impact and Overload	Motor	Abnormal Noise	- Visible or invisible damage may occur. The steering wheel may pull to one side due to dropped parts. Precision motor/ECU parts are sensitive to vibration and shock. Overloading may cause unexpected damage.	- Do not use a damaged EPS. - Do not overload any component.
	ECU	Circuit damage - Incorrect weld point - Broken printed circuit board - Damaged precision parts
	Torque Sensor	Insufficient steering effort	Overloading the INPUT shaft may cause torque sensor malfunction.	- Do not strike connecting parts (during insertion and tightening). - Use the specified tool to remove the steering wheel. (Do not hit it with a hammer.) - Do not use a damaged EPS.
	Shaft	Insufficient steering wheel effort (uneven between left and right sides)		Do not use a damaged EPS.
Pull / Dent	Restrain	- Malfunction - Power supply not possible - EPS malfunction	Disconnection between the connector part and the harness	Do not overload the suspension.
Abnormal storage temperature	Engine / ECU	Abnormal steering effort due to incorrect engine/ECU operation	- Waterproof under normal conditions. Even slight moisture may cause a malfunction of the precision engine/ECU parts.	- Maintain normal temperature and proper humidity during storage. - Avoid submersion.

1. Do not strike electronic parts. If they are dropped or subjected to impact, replace them with new ones. 2. Avoid exposing electronic parts to heat and moisture. 3. Do not touch the connector terminals to avoid deformation and static electricity. 4. Do not strike the motor and torque sensor parts. If they are dropped or damaged, replace them with new ones. 5. Disconnect or connect the connector with the ignition switched OFF.