Check Can Communication Line For Open

Ignition "OFF"
Disconnect ECM harness connector.
Measure resistance between terminals 36 and 37 of the ECM harness connector.
Specification: Approx. 110~130Ω

Fig 1: Measuring Resistance Between Terminals 36 And 37 Of ECM Harness Connector
Courtesy of HYUNDAI MOTOR CO.
Is resistance within the specification?
YES : --> Go to next step as below.

NO : --> Check for open in wiring related to the CAN communication. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.