Kia Forte: Description
EPS (Electronic 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.
Schematic Diagrams
MDPS Circuit Diagram
Harness Connector
Connector
Pin no
Pin name
Battery
1
Battery +
2
Battery -
Vehicl ...
General Inspection
After or before servicing the EPS system, perform the troubleshooting
and test procedure as follows. Compare the system condition with normal condition
in the table below and if abnormal symp ...
See also:
Installation
Sensor Fit
•
Handle the sensor with care.
•
...
Inspection
1.
Check the clutch release cylinder for fluid leakage.
2.
Check the clutch release cylinder boot for damage.
...
Shift Lever Inspection
1.
Check operating of lever of T/M side when operating shift lever
after assembly.
2.
When shift lever to "R" position, check th ...
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