From the manual:
Any malfunction of the ABS electrical or mechanical components is judged by the self-diagnosis function in the ABS control unit. All malfunctions are indicated by the warning lamp in the instrument panel. In normal condition, the ABS warning lamp is on for 2~3 seconds after engine starts and goes out. If it stays on continuously, you may have malfunction with ABS system. The location of a malfunction is indicated to the technician by a diagnosis scan tool (Hi-scan pro). The self-diagnosis and indication functions must be used when diagnosing malfunctions of the ABS.
SELF-DIAGNOSIS
The ABS control unit starts self-diagnostic functions after the ignition is switched ON. The ABS control unit detects failure for each circuit and component by comparing condition of the system with limited condition set inside the ABS control unit, ABS control unit stores the failure code and then outputs the four-digits of malfunction code to the diagnostic scan tool (Hi-scan pro) when the ABS terminal of the diagnostic connector is connected.

SELF-DIAGNOSIS PROCEDURES (WITH THE DIAGNOSTIC SCAN TOOL)
1. ptxtWith the ignition switch OFF, connect the diagnostic scan tool (Hi-scan pro) to the data link connector located under side of master vacuum in engine compartment.


2. Make sure the ignition switch is in the on position, and then choose correct vehicle and model, proceed to diagnostic data link menu item.
3. Choose the inspection item after initializing the unit.
4. Press malfunction code detection No.1 and diagnostic scan tool will display any malfunction code found.



A malfunction code is a four-digits number which is continuously outputs until the failure code is erased by the diagnostic scan tool.

5. From the list of failure codes, verify the failed part and repair it according to self-diagnosis procedures.
6. After repair, erase all malfunction codes stored in the ABS control unit by selecting inspection item (No.4).

HOW TO ERASE MALFUNCTION CODE (WITH THE DIAGNOSTIC SCAN TOOL)
ABS control unit has an automatic malfunction code erasing function as below.
1. After the failures have been serviced, confirm the vehicle functions properly.
2. Press the enter key in malfunction code erase item (No.4) among the inspection items of the diagnostic scan tool (Hi-scan pro).

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