Kia Optima: 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.
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- ...
See also:
Replacement (With EPB)
Rear brake pads
1.
Remove the rear wheel & tire.
2.
Connect the GDS to the data link
connector located underneath the dash panel.
3.
Ignition "ON& ...
Window opening and closing
Type A
The driver’s door has a master power window switch that controls all the windows
in the vehicle.
To open or close a window, press down or pull up the front portion of the corresponding
...
Installation
Room Lamp
1.
Reconnect the connector.
2.
Install the room lamp assembly.
3.
Install the lens.
Vanity Lamp
1.
Reconnect the vanity lamp connector ...
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