Repair Procedures

General Inspection

After or before servicing the EPS system, perform the following troubleshooting and inspection procedure. Compare the system condition with the normal condition in the table below. If an abnormal symptom is found, perform the necessary measures and inspection.

Test Conditions	Normal condition: The motor should not provide steering assist.
	Symptom	Possible Cause	Remedy
Ignition OFF	The motor provides steering assist.	ASP is not calibrated.	Perform ASP calibration using the scan tool.
		IG Power Supply Circuits	Inspect the IG power supply line.

Test Conditions	Normal condition: The motor should not provide steering assist, and the warning lamp should illuminate.
	Symptom	Possible Cause	Remedy
IG ON / Engine OFF	The motor provides steering assist.	ASP is not calibrated.	Perform ASP calibration using the scan tool.
		EMS CAN signal not received.	Inspect the CAN line.
	The warning lamp does not illuminate.	Cluster Malfunction	Inspect the cluster and cluster harness.

Test Conditions	Normal condition: The motor provides steering assist, and the warning lamp does not illuminate.
	Symptom	Possible Cause	Remedy
IG ON / Engine ON	The warning lamp illuminates, and the motor does not provide steering assist.	EPS (Battery Power) and IG Power Supply Malfunction	Inspect the connector and harness for EPS (Battery Power) and the IG power supply line.
		DTC is detected by the system.	Perform a self-diagnosis using a scan tool, and repair or replace as necessary.
	The warning lamp illuminates and the electric motor assists steering.	ASP is not calibrated.	Perform ASP calibration using the scan tool.
		CAN communication error between EPS and cluster.	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. If the EPS warning lamp is not illuminated, it is not a malfunction of the EPS system. After the ignition is turned on, the steering wheel becomes heavier while the EPS system performs diagnostics, for approximately 2 seconds. After that, this becomes normal steering operation. A relay noise from the EPS may be heard after the ignition is turned on or off. This is normal. A motor noise may be heard when steering while the vehicle is stationary or moving at low speed. This is a normal operating noise.

Use caution when performing ASP (Absolute Steering Position) calibration or EPS type recognition.

• Before calibrating ASP or recognizing EPS type, check that the battery is fully charged.
• Be careful not to disconnect any cables connected to the vehicle or the scan tool during ASP calibration or EPS type recognition.
• After ASP calibration or EPS type recognition is complete, turn the ignition switch OFF and wait a few seconds, then start the engine to make sure the vehicle operates normally.

ASP Calibration

1. 1
   Connect the scan tool to the diagnostic link connector (16-pin) under the protective cover on the driver's seat side, then turn the ignition on to activate the scan tool.
2. 2
   In the GDS vehicle type selection menu, select "Vehicle Type" and "EPS System," then select "OK."
3. 3
   Select ASP Calibration.
4. 4
   Continue the test in accordance with the instructions on the screen.

   

   

   

   

5. 5
   Connect the scan tool to the diagnostic link connector (16-pin) under the protective cover on the driver's seat side, then turn the ignition on to activate the scan tool.
6. 6
   In the GDS vehicle type selection menu, select "Vehicle Type" and "EPS System," then select "OK."
7. 7
   Select EPS Type Recognition Calibration.
8. 8
   Continue the test in accordance with the instructions on the screen.

   

   

   

EPS Specification Recognition