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.


|