Kia Sorento: Description and Operation

Kia Sorento (MQ4, 2021-2026) Service Manual / Steering System / Motor Driven Power Steering / Description and Operation

Description

The Motor Driven Power Steering (MDPS) system uses an electric motor to assist the steering force and it is an engine operation independent steering system.

The 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.

(However, replacement of parts by technical communication distribution should follow the guidelines.)

Operation

Note With Regard to Diagnosis

Trouble factor	Check item	Trouble symtom	Explanation	Note
Drop, impact, and overload	Motor	Abnormal noise	Visible or invisible damage may occur. The steering wheel may pull to one side when dropped parts are used. Precise parts of motor / ECU are sensitive to vibration and impact. Overload may cause unexpected damage.	Do not use the impacted MDPS.
	ECU	Circuit damage		Do not overload each part.
		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 MDPS.
	Shaft	Insufficient steering effort (Uneven between LH and RH)		Do not use impacted MDPS
Pull/Dent	Harness	Malfunctioning	Disconnection between harness connecting portion and harness	Do not overload the harness
		Power operation impossible
		Malfunction of MDPS
Abnormal storage temperature	Motor/ECU	Abnormal steering effort by improper operation of the motor/ECU	Waterproof at normal condition	Maintain normal storage temperature and humidity.
			Even a slight moisture can cause malfunction in precise parts of the motor / ECU	Avoid submerging in water.

•	Do not impact the electronic parts. If they are dropped or impacted, replace them with new ones.

•	Avoid heat and moisture to the electronic parts.

•	Do not contact the connect terminal to avoid deformation and static electricity.

•	Do not impact the motor and torque sensor parts. If they are dropped or impacted, replace them with new ones.

•	The connector should be disconnected or connected with ignition OFF.

Motor Driven Power Steering

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Components and Components Location

Components [C-MDPS] 1. Driver Aigbag Module (DAB)2. Steering wheel3. Steering column4. MDPS power pack assembly (Motor + ECU)5. Universal joint ...

Kia Sorento: Description and Operation

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