Component Inspection

WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.

Inspection Condition	Inspection Procedure	Reference
Ignition "ON".	Disconnect components to reach to the control unit which is connected to the communication circuit related P-CAN (PCM, VDC, Airbag and etc.). Connect KDS to Data Link Connector (DLC). Disconnect the control unit connector Check the faulty control unit which is to communicate to other units (PCM, VDC, Airbag and etc.) with KDS. Is it possible to communicate to the system with KDS, when disconnect the specified connector?	-

Good

Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
Repair or replace as necessary and then go to "Verification of Repair " procedure.

No Good

Carefully re-do this troubleshooting guide steps.
If problem still occurs, replace control unit that causing the fault and then go to "Verification of Repair " procedure.