Kia Optima DL3: Motor Driven Power Steering / MDPS System

Kia Optima DL3 2019-2025 Service and Repair Manual / Steering System / Motor Driven Power Steering / MDPS System

Repair procedures

Inspection
1.

MDPS power pack assembly failure can be quickly diagnosed using the vehicle diagnostic system (KDS).

(1)

Self-diagnosis: Checking failure and providing DTC code.
(2)

Current data: Checking the system input/output data state.
(3)

Actuation test: Checking the system operation condition.
(4)

Additional function: Controlling other features including system option setting, calibration adjustment and other function.

  

When a DTC related to MDPS motor occurs, check the connectors and wiring. If there is no problem, replace the motor.
Replacement
1.

Remove the MDPS assembly.

(Refer to Motor Driven Power Steering - "MDPS Column & Housing")

2.

Disconnect the MDPS System connector (A).

  

Disconnect the connector in the following order.
3.

Remove the MDPS System (A) after loosening the mounting bolts.

Tightening torque :

8.0 - 12.0 N·m (0.8 - 1.2 kgf·m, 5.9 - 8.8 lb-ft)

Installation
  
•

Install the component to the specified torque.
•

Note that internal damage may occur if the component drops. In this case, use it after inspecting.
•

When installing a power pack, install it after checking the coupling (A).
•

When attaching the power pack to the MDPS, attach the power pack in accordance with the guide line as follows.
1.

Install in the reverse order of removal.
2.

Perform the "EPS Type Recognition" by KDS.

(Refer to MDPS System - "Diagnosis with KDS")

3.

Perform the "SAS Calibration" by KDS.

(Refer to MDPS System - "Diagnosis with KDS")

4.

Check and erase the DTC.

  
•

Check if there is any DTC code found before DTC erase.
•

Replace the parts by MDPS Power Pack unit.

(Never detach the ECU and motor.)
5.

Perform the MDPS performance test.

(Refer to Motor Driven Power Steering - "Troubleshooting")

Diagnosis with KDS

[EPS Type Recognition]

1.

Since MDPS can store various tuning maps with different steering feelings in the ECU and different steering feelings depending on the application area and the vehicle engine type, it is necessary to set codes appropriate for the application area and the vehicle.

  

If missing the EPS type recognition procedure, a problem may occur with motor driven power steering performance.
  

EPS type recognition procedure is necessary for;

–

DTC indicator illuminate (DTC Code: C1702, Application Area Fault).
–

Excessive different steering feeling.
–

Unstable steering.

[EPS Type Recognition procedures]

  
•

Check if the battery voltage is in normal using KDS before EPS type recognition procedure.
•

Be careful not to disconnect any connectors from the vehicle or KDS while EPS type recognition.

•

Once complete the EPS type recognition procedure, turn off the engine and wait at least 20 seconds.

And IG ON and check if the system works in normal.
1.

Connect the self-diagnosis connector (16 pins) located in the lower of driver side crash pad to KDS.

2.

Turn the self-diagnosis device after ignition is ON.
3.

Align the steering wheel to straight ahead position.
4.

After Selecting the "vehicle model" and "system", select the "EPS Type Recognition" on diagnostic tool vehicle selection screen.
5.

Remove the DTC.
6.

Turn off the ignition and wait for 20 seconds or more before starting the engine. And then make sure that MDPS works properly.

[SAS Calibration]

–

Steering-angle sensor is a built in function in MDPS torque angle sensor (TAS) to detect the steering angle and steering angle speed of the driver.

Steering angle and steering angle speed are used for damping control and restoring control in addition to the basic steering force.
  

Steering angle initializing (ASP calibration) is necessary for;

–

DTC indicator illuminate (DTC Code: C1261, Calibration Fault).
–

MDPS restoring control function OFF.
–

ESC function OFF.

[SAS Calibration procedures]

  
•

Check if the battery voltage is in normal using KDS before Steering Angle initializing (ASP calibration) procedure.
•

Be careful not to disconnect any connectors from the vehicle or KDS while Steering angle initializing procedure.
•

Once complete the Steering Initializing procedure, turn off the engine and wait at least 10 seconds.

And IG ON and check if the system works in normal.
1.

Connect the self-diagnosis connector (16 pins) located in the lower of driver side crash pad to KDS.
2.

Turn the self-diagnosis device after ignition is ON.
3.

Align the steering wheel to straight ahead position.
4.

After Selecting the "vehicle model" and "system", select the "SAS Calibration" on diagnostic tool vehicle selection screen.
5.

Remove the DTC.
6.

Turn off the ignition and wait for 20 seconds or more before starting the engine. And then make sure that MDPS works properly.

    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.

    Repair procedures Removal 1. Align the steering wheel so that the front wheels to facing straight ahead.    If the steering wheel and the front tires does not synchronize to their centers together, open circuit on the clock spring cable may occur due to change the steering wheel turning.

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    Components and components location Components Connector Pin Function [Connector A] Pin NO Funtion Pin NO Funtion 1 Battery (+) 21 IGN2 2 ILL+ (TAIL) 22 IGN1

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