Hyundai Ioniq (AE): Motor Driven Power Steering / Description and operation

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / Steering System / Motor Driven Power Steering / Description and operation

Description
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.
Operation
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

    Components Location1. Steering wheel2. Steering column3. MDPS motor4. MDPS ECU5. Universal joint6. Steering gear box7. Bellows8. Tie rod9. Tie rod end

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