Kia 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.
| • |
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.
|
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
1. Steering wheel
2. Steering column
3. ECU
4. Motor
5. Steering gear box
MDPS Circuit Diagram
Harness Connector
...
See also:
Intake Actuator. Description and Operation
Description
1.
The intake actuator is located
at the blower unit.
2.
It regulates the intake door
by signal from control unit.
3.
Pressing the intake ...
Cruise Control
The cruise control system allows you to program the vehicle to maintain a constant
speed without resting your foot on the accelerator pedal.
With cruise control, you can set and automatically maint ...
Replacement
1.
Disconnect the negative (-) battery
terminal.
2.
Loosen the mounting bolts and
then remove the under cover (A).
3.
Disconnect the connector ...
Description and Operation
Components and Components Location