Hyundai Sonata: Electric Power Steering / Description and Operation
EPS (Electric power steering) 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 (Torque Sensor, Fail-safe relay, etc.) of the EPS
system are located inside the steering column & EPS unit assembly
and the steering column & EPS unit assembly must not be disassemble
to inspect or replace them.
| 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
|
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 |
| 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 |
|
R-MDPS operation machanism
MDPS Circuit Diagram
C-MDPS TYPE
R-MDPS TYPETerminal function
C-MDPS TYPE
TypePin NoDescriptionBattery1Battery +2Battery -VSS(Vehicle Speed Signals)1IGN2-3-4-5-6-7High_CAN8Low_CAN
R-MDPS ...
Schematic Diagrams