Kia Cee'd: 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.
Components and components location
Components
1. Steering
column shaft
2. ECU
3. Motor
4. Steering gear box
...
Other information:
Kia Cee'd JD Service Manual: Components and components location
Components Location
1. Engine Control Module (ECM)
2. Manifold Absolute Pressure Sensor (MAPS)
3. Intake Air Temperature Sensor (IATS)
4. Engine Coolant Temperature Sensor (ECTS)
5. Throttle Position Sensor (TPS) [integrated into ETC Module]
6 ...
Kia Cee'd JD Service Manual: Troubleshooting
Failure Diagnosis
1.
In principle, ESP and TCS controls are prohibited in case of ABS failure.
2.
When ESP or TCS fails, only the failed system control is prohibited.
3.
However, when the solenoid va ...
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