Hyundai Ioniq: Motor Driven Power Steering / Description and operation
MDPS (Motor Dirven Power Steering) system uses an electric motor to assist the steering force and it is an engine operation independent steering system.
MDPS 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 MDPS system are located inside the steering column. MDPS unit assembly, steering column, and MDPS 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
|
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 |
|
Other information:
Removal1.Disconnect the negative(-) battery terminal.2.Remove the crash ped lower panel.(Refer to Body - "Crash Ped Lower Panel")3.Remove the start/stop button (B) after disconnect the connector (A).Installation 1.Install the start/stop button.2.Install the crash pad lower panel...
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