Kia Niro: Electric Power Steering / Repair procedures

General Inspection
Before and after 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 does 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, the EPS system is not malfunctioning.

After switching the ignition on, the steering wheel becomes heavier for about 2 seconds to perform EPS system diagnostics, and then returns to normal steering condition.

When switching on or off the ignition, the EPS relay noise may occur, which is considered normal.

If the vehicle is steered in stationary or low speed driving condition, motor noise may occur, which is considered normal.

Caution for ASP (Absolute Steering Position) calibration or EPS type recognition

Check that 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.

After completing the ASP calibration or EPS type recognition, switch off the ignition and wait for several seconds. Then, start the engine to confirm normal operation of the vehicle.

ASP Calibration

1.

Select "ASP Calibration".

2.

Proceed with the test according to the screen instructions.

EPS Type Recognition Procedure

1.

Select "EPS Type Recognition".

2.

Proceed with the test according to the screen instructions.

Schematic diagrams
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