Control Circuit Inspection

Ignition "OFF"
Disconnect HO2S sensor connector.
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 3 of sensor harness connector.
Specification: approximately 3.7V

Fig 1: Measuring Voltage Between Terminal 3 Of Sensor Harness Connector
Courtesy of HYUNDAI MOTOR CO.
Is measure voltage within Specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Check for open or Short to ground in control circuit.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.