Kia Stinger: Steering System / Electric Power Steering

Kia Stinger CK 2018-2020 Service Manual / Steering System / Electric Power Steering

Description and operation
Description

EPS (Electric power steering, Column assist type) system is an engine operation independent steering system that uses an electric motor to assist the steering force.

EPS control module controls the motor operation based on input signals from torque sensor and steering angle sensor via CAN (Controller Area Network), resulting in a more precise and timely control of steering assist thatn conventional engine-driven hydraulic systems.

Components (Steering Angle Sensor, Torque Sensor, Fail-safe relay, etc.) of the EPS system are located inside the steering column. EPS unit assembly, steering column, and EPS 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
- 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 EPS.
- Do not overload each part.
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 impacted EPS
Pull/Dent
Harness
- Malfunctioning
- Power operation impossible
- 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 normal condition
- Even a slight moisture can cause malfunction in precise parts of the motor / ECU
- Maintain normal storage temperature and humidity.
- Avoid submerging in water.

1.

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

2.

Avoid heat and moisture to the electronic parts.

3.

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

4.

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

5.

The connector should be disconnected or connected with ignition OFF.

Components and components location
Components

1. Steering column
2. Dust cover
3. Universal joint

Schematic diagrams
Schematic Diagrams

Harness Connector

Item
Pin
Pin name
MDPS Power
1
Battery +
2
Battery -
MDPS Unit
1
Ignition
7
CAN High
8
CAN Low

Repair procedures
General Inspection

Before and after servicing the EPS system, perform the troubleshooting and test procedure as follows. Compare the system condition with normal condition in the table below and if abnormal symptom is detected, perform necessary remedy and inspection.

Test condition
Normal condition: Motor must not supply steering assist.
Symptom
Possible cause
Remedy
IG Off
Motor supplies steering assist.
ASP is not calibrated.
Perform the ASP calibration using a scan tool.
IG power supplies
Inspect the IG power supply line.

Test condition
Normal condition: Motor must not supply steering assist, Warning lamp is illuminated.
Symptom
Possible cause
Remedy
IG On/Engine Off
Motor supplies steering assist.
ASP is not calibrated.
Perform the ASP calibration using a scan tool.
EMS CAN signal is not received.
Inspect the CAN line.
Warning lamp is not illuminated.
Cluster fault
Inspect the cluster and cluster harness.

Test condition
Normal condition: Motor supplies steering assist, Warning lamp is not illuminated.
Symptom
Possible cause
Remedy
IG On/Engine On
Warning lamp is illuminated and motor does not supply steering assist.
EPS (Hot at all times) and IG power supply fault
Inspect the connector and harness for EPS (Hot at all times) and IG power supply line.
DTC is detected by system.
Perform the self test using a scan tool and repair or replace.
Warning lamp is illuminated and motor supplies steering assist.
ASP is not calibrated.
Perform the ASP calibration using a scan tool.
CAN communication between EPS and cluster is fault.
Inspect the CAN line.

ASP: Absolute Steering Position

CAN: Controller Area Network

EMS: Engine Management System

  

The following symptoms may occur during normal vehicle operation and if there is no EPS warning light illumination, the EPS system is not malfunctioning.

After switching the ignition on, the steering wheel becomes heavier for about 2 seconds to perform EPS system diagnostics, and then returns to normal steering condition.

When switching on or off the ignition, the EPS relay noise may occur, which is considered normal.

If the vehicle is steered in stationary or low speed driving condition, motor noise may occur, which is considered normal.

Caution for ASP (Absolute Steering Position) calibration or EPS type recognition

Check that the battery is fully charged before ASP calibration or EPS type recognition.

Be careful not to disconnect any cables connected to the vehicle or scan tool during ASP calibration or EPS type recognition.

After completing the ASP calibration or EPS type recognition, switch off the ignition and wait for several seconds. Then, start the engine to confirm normal operation of the vehicle.

ASA Calibration

1.

Select "Steering Angle Sensor (SAS) Calibration".

2.

Proceed with the test according to the screen instructions.

EPS Type Recognition Procedure

1.

Select "EPS Variant Coding".

2.

Proceed with the test according to the screen instructions.

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