Control Circuit Inspection

Ignition "OFF".
Disconnect HO2S connector.
Ignition "ON", Engine "OFF".
Measure voltage between VG terminal of the sensor harness connector and chassis ground.
Specification: Approx. 2~3V
Measure resistance between VG terminal and other terminals of the HO2S harness connector.
Specification: Infinite

Fig 1: Measuring Resistance Between VG Terminal And Other Terminals Of HO2S Connector (1 Of 4)
Courtesy of HYUNDAI MOTOR CO.

Fig 2: Measuring Resistance Between VG Terminal And Other Terminals Of HO2S Connector (2 Of 4)
Courtesy of HYUNDAI MOTOR CO.

Fig 3: Measuring Resistance Between VG Terminal And Other Terminals Of HO2S Connector (3 Of 4)
Courtesy of HYUNDAI MOTOR CO.

Fig 4: Measuring Resistance Between VG Terminal And Other Terminals Of HO2S Connector (4 Of 4)
Courtesy of HYUNDAI MOTOR CO.
Is HO2S display near the specification?
YES

Go to next step as below.

NO

Repair open or short to ground in signal circuit 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.