Kia Optima Hybrid: Electric Power Steering / Description and Operation

Description
EPS (Electric power steering, Column assist type) system uses an electric motor to assist the steering force and it is an engine operation independent steering system.
EPS control module controls the motor operation according to information received from the each sensor and CAN (Controller Area Network),
resulting in a more precise and timely control of steering assist than conventional engine-driven hydraulic systems. Components (Steering Angle Sensor, Torque Sensor, Fail-safe relay, etc.) of the EPS system are located inside the steering column. EPS unit assembly, steering column, and EPS unit assembly must not be disassembled for inspection. They must be replaced if necessary.
Note With Regard to diagnosis
Trouble factor
Check item
Trouble symtom
Explanation
Note
Drop, impact, and overload
Motor
Abnormal noise
- Visable or unvisable damage can occur.The steering wheel could pull to one side by using the dropped parts.- Precise parts of motor/ECU are sensitive to vibration and impact.- Overload can cause unexpected damage
- Do not use the impacted EPS.- Do not overload each parts.
ECU
Circuit damage- Wrong welding point- Broken PCB- Damaged precise parts
Torque sensor
Insufficient steering effort
Overload to INPUT shaft can cause malfunction of the torque sensor
- Do not impact the connecting parts (When inserting and torquing)- Use the specified tool to remove the steering wheel. (Do not hammer on it)- Do not use the impacted EPS
Shaft
Insufficient steering effort (Uneven between LH and RH)
 
Do not use the impacted EPS
Pull/Dent
Harness
- Malfunction-impossible power operation- Malfunction of EPS
Disconnection between harness connecting portion and harness
Do not overload the harness
Abnormal storage temperature
Motor/ECU
Abnormal steering effort by improper operation of the motor/ECU
- Waterproof at the normal condition- Even a little moisture can cause malfunction of the precise parts of the motor/ECU
- Keep the normal temperature and proper moisture, while storaging- Avoid drowning

1. Do not impact the electronic parts, if they are dropped or impacted, replace them with new ones.
2. Avoid heat and moisture to the electronic parts.
3. Do not contact the connect terminal to avoid deformation and static electricity.
4. Do not impact the motor and torque sensor parts, if they are dropped or impacted, replace them with new ones.
5. The connector should be disconnected or connected with IG OFF.
Electric Power Steering

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Components and Components Location

Components 1. Steering wheel2. Steering column3. ECU4. Motor5. Steering gear box MDPS Circuit Diagram Harness Connector TypePin NoDescriptionBattery1Battery -2Battery +Vehicle1IGN2-3-4-5-6-7High_CAN8Low_CAN ...

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