Kia Optima Hybrid: Electric Power Steering / Steering Column and Shaft Repair procedures

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Steering System / Electric Power Steering / Steering Column and Shaft Repair procedures

Replacement

1.	Disconnect the battery negative cable from the battery and then wait for at least 30 seconds.

2.	Turn the steering wheel so that the front wheels can face straight ahead.

3.	Push the pin (A) and then disconnect the airbag module from the steering wheel.

4.	Disconnect the airbag module connector (A) & horn connector (B) and then remove the airbag module from the steering wheel.

Disconnect the lock nut (A) & connector (B) and the remove the steering wheel from the steering column shaft.

Tightening torque :

39.2 ~ 49.0N.m (4.0 ~ 5.0kgf.m, 28.9 ~ 36.2lb-ft)

Do not hammer on the steering wheel to remove it may damage the steering column.

6.	Loosen the screw and then remove the steering column upper (A) and lower (B) shroud.

7.	Disconnect the connector and then remove the clock spring (A).

8.	Disconnect the connector & screw and then remove the multifunction switches (A).

9.	Remove the crash lower panel.

10.

Loosen the bolt (A) and then disconnect the universal joint assembly from the pinion of the steering gear box.

Tightening torque :

29.4 ~ 34.3N.m (3.0 ~ 3.5kgf.m, 21.7 ~ 25.7lb-ft)

•	Do not use the bolt again.

11.	Loosen the screw and then remove the shower duct (A).

12.	Disconnect all connectors connected to the steering column.

13.

Remove the steering column by loosening the mounting bolts and nuts..

Tightening torque :

12.7 ~ 17.7N.m (1.3 ~ 1.8kgf.m, 9.4 ~ 13.0lb-ft)

14.	Installation is the reverse of the removal.

15.	Compensate the steering angle sensor after replaceing the steering column.

Disassembly

Universal joint assembly

1.	Loosen the bolt (A) and then disconnect the universal joint assembly from the steering column assembly.

2.	Reassembly is the reverse of the disassembly.

Key lock assembly

1.	Make a groove on the head of special bolts (A) by a punch.

2.	Loosen the special bolt using a screw driver and then remove the key lock assembly from the steering column assembly.

3.	Reassembly is the reverse of the disassembly.

Inspection

1.	Check the steering column for damage and deformation.

2.	Check the joint bearing for damage and wear.

3.	Check the tilt bracket for damage and cracks.

4.	Check the key lock assembly for proper operation and replace it if necessary.

Adjustment

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.
Test condition	Symptom	Possible cause	Remedy
IG On/Engine Off	Motor supplies steering assist.	ASP is not calibrated.	Perform the ASP calibration using a scan tool.
	Motor supplies steering assist.	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.

•	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.

•	After turning the ignition switch on or off, EPS relay noise may occur but it is normal.

•	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

•	Check if 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.

•	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.

Components and Components Location

Components 1. Steering wheel2. Steering column3. ECU4. Motor5. Steering gear box MDPS Circuit Diagram Harness Connector TypePin NoDescriptionBattery1Battery -2Battery +Vehicle1IGN2-3-4-5-6-7High_CAN8Low_CAN ...

Steering Gear box Components and Components Location

Components 1. Tie rod end2. Lock nut3. Bellows 4. Bellows band5. Tie rod6. Rack bar 7. Dust packing 8. Dust cap9. Oil seal10. Pinion plug11. Pinion assembly12. Yoke plug13. Yoke spring14. Support yoke ...

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