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.
|
