Kia Sorento: Repair procedures

Kia Sorento (MQ4, 2021-2026) Service Manual / Steering System / Motor Driven Power Steering / Repair procedures

A/S Repair produres

[C-MDPS]

C-MDPS System A/S Workflow

Steering System — Motor Driven Power Steering / Repair procedures / A/S Repair produres illustration

Noise / malfunction Inspection

Steering System — Motor Driven Power Steering / Repair procedures / A/S Repair produres illustration

Warning lamp (DTC) / CAN Line error

2 - 1 Checking Connectors and Wiring

Checking Connectors and Wiring.

Check for damage, push-back, or improper connection in each connector and wiring.

(1)

Check the wiring on the vehicle side.

–	Check for open / short - circuit due to faulty connection, damage, or foreign substance.

(2)

Check the wiring on the ECU side (motor 3 - phase power).

–	Check for open / short - circuit due to faulty connection, damage, or foreign substance.

(3)

Check the motor connector.

–

Terminal expansion and damage

Steering System — Motor Driven Power Steering / Repair procedures / A/S Repair produres illustration

The MDPS motor must be replaced if connector or terminals are damaged.

(4)

Check the motor wiring.

Steering System — Motor Driven Power Steering / Repair procedures / A/S Repair produres illustration

The MDPS motor must be replaced if connector or terminals are damaged.

(5)

Remove the grommet (A) and then check the wiring on the Torque Angle Sensor (TAS) side (B).

–

Check for damage, push-back, or improper connection in each connector and wiring.

Steering System — Motor Driven Power Steering / Repair procedures / A/S Repair produres illustration

•	The MDPS motor must be replaced if connector or terminals are damaged.

•	Check the Torque Angle Sensor (TAS) wiring in case of C1259/C1290 DTC.

(6)	Check the wiring ECU side (A).

2 - 2 Inspection Items per DTC

DTC	Problem	Fault isolation method	Actions to take
C129002	Torque sensor signal error	Erase DTC and check the sensor connector connection.	In case of bad connection condition of the sensor connector, replace the warning light sensor cable and replace the column & housing (56390) for another case.
C125901 C125929 C125938	Steering angle sensor signal error	After Resetting zero point & erasing DTC, check connector connection condition.
C111201	Torque sensor power supply error	Erase DTC and check the connector connection condition.	In case of bad connection condition of the sensor connector, replace the warning light sensor cable and replace the power pack (56370) for another case.
C160404	ECU hardware error	Erase DTC and check.	In case of reoccurrence, replace the power pack (56370)
C170401	Open Relay
C170504	ECU Charge/discharge circuit error
C241216 C241262	Motor circuit open/short Motor current error
C241319 C241328 C241396	Motor Current over flow error Motor current gate error Motor current sensor error current error
C240162	Motor circuit error
C1261	Steering angle zero-setting error	After Resetting zero point & erasing DTC, Check if the sensor connector is connected incorrectly	Resetting zero point & replace the column & housing (56390)
C161187 C161F64 C161F86	EMS CAN message receive error Vehicle speed monitoring error Vehicle speed signal error	1. Check the Chassis CAN condition. 2. Check the connector connection. 3. Check the Engine ECU. 4. Check the history of the engine shutdown while driving.	Erase DTC (MDPS replacing no required)
C161688	CAN BUS OFF
C162887 C163386	Cluster CAN signal receive error Cluster vehicle speed error	Check the cluster connector connection.
C169287 C169386	VSM message receive error ESC signal error	Check the ESC, Chassis CAN condition.
C171101	ECU abnormal shutdown	Check after erasing DTC
C180487 C180586	LKA message receive error LKA signal error	Check the LAK, CAN Line
C181287 C181786	Gateway CAN message receive error Gateway CAN signal error	Check the Gateway.

MDPS Performance Inspection

1.	Inspect steering angle and DTCs relevant to the steering system.

Inspection for heavy steering effort

(1)	Inspect tire pressure and width.

(2)	Check DTCs relevant to the CAN communication error.

(3)	Check the wheel alignment.

MDPS common problems

Case 1	Case 2	Case 3

Steering shaft noise	Clock spring noise	DAB / Wire noise
Replace steering shaft	Replace clock spring	Rearrange and replace DAB

Case 4	Case 5	Case 6

Multifunction switch noise	M8 nut mount defect	M10 nut mount defect
Replace multifunction switch	Retighten nut	Retighten nut

Case 7	Case 8

Cowl top bolt mount defect	Cowl bar nut mount defect
Retighten cowl top bolt	Replace clock spring

The following phenomena are not malfunctions when the MDPS warning lamp is not lit.

•	Immediately after starting the engine, there is no temporary auxiliary steering force during the MDPS system self-diagnosis time (about 2 seconds), but this is not a malfunction.

•	Noise due to relay connection on engine On or Off, but this is normal operating sound.

•	Noise due to motor rotation during steering or low-speed driving, but this is normal operating sound.

Cautions to be taken when handling the MDPS (Motor Driven Power Steering)

1.	Failure occurs due to internal damage because of the drop of and shock and excessive external force on the new partial component. → Be cautious of shock on the partial component and replace the damaged part (due to drop, etc.) with a new one.

2.	When fastening the steering, excessive impact may result in twisting the center point of the torque sensor.

3.	When removing/installing the connector the wiring may be damaged (deformed) by excessive external force.

4.	Be cautious when storing and replacing the partial components under the abnormal temperature and humidity conditions.

Schematic Diagrams

Schematic Diagrams [C-MDPS] Terminal function [C-MDPS] Type Pin No Description ...

Adjustment

Diagnosis with KDS [MDPS Tuning Data Setting] Since MDPS can store various tuning maps with different steering feelings in the ECU and different steering feelings depending on the app...

Kia Sorento: Repair procedures

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Manuals list