Kia Optima: Repair procedures - Electric Power Steering - Steering System - Kia Optima TF 2011-2018 Service ManualKia Optima: Repair procedures

General Inspection

After or before 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 dose 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, it is not malfunction of EPS system.
Х After turning the ignition switch on, the steering wheel becomes heavier while it performs EPS system diagnostics, for about 2 seconds, then it becomes normal steering condition.
Х After turning the ignition switch on or off, EPS relay noise may occur but it is normal.
Х When it is steered, while the vehicle is stopped or in low driving speed, motor noise may occur but it is normal operating one.
Caution when ASP (Absolute Steering Position) calibration or EPS type recognition
Х Check if the battery is fully charged before ASP calibration or EPS type recognition.
Х Be careful not to disconnect any cables connected to the vehicle or scan tool during ASP calibration or EPS type recognition.
Х When the ASP calibration or EPS type recognition is completed, turn the ignition switch off and wait for several seconds, then start the engine to confirm normal operation of the vehicle.
ASP Calibration
1. Select "Steering Angle Sensor".
2. Proceed with the test according to the screen introductions.

EPS Type Recognition Procedure
1. Select "EPS Variant Coding".
2. Proceed with the test according to the screen introductions.


Description and Operation
Description EPS (Electric power steering, Column assist type) system uses an electric motor to assist the steering force and it is an engine operation independent steering system. EPS control m ...

Components and Components Location
Components 1. Steering wheel 2. Steering column 3. ECU 4. Motor 5. Steering gear box MDPS Circuit Diagram Harness Connector ...

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