Power Circuit Inspection

Ignition "OFF".
Disconnect HO2S connector.
Ignition "ON"&Engine "OFF".
Measure voltage between Heater Power terminal of the HO2S harness connector and chassis ground.
Specification: B+

Fig 1: Measuring Voltage Between Heater Power Terminal Of HO2S Connector And Chassis Ground (1 Of 2)
Courtesy of HYUNDAI MOTOR CO.

Fig 2: Measuring Voltage Between Heater Power Terminal Of HO2S Connector And Chassis Ground (2 Of 2)
Courtesy of HYUNDAI MOTOR CO.
Is voltage display near the specified value?
YES

Go to "CONTROL CIRCUIT INSPECTION " procedure.

NO

Check for open or short in the power supply circuit between the main relay and the HO2S.

Especially check for "15A Sensor 2 fuse" is installed and not blown.

Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire (s). Do not attempt to repair the wire (s), connector, or the terminals.