Control Circuit Inspection

Ignition "OFF".
Disconnect HO2S connector.
Ignition "ON" & Engine "OFF".
Measure voltage between Heater Control terminal of the HO2S harness connector and chassis ground.
Specification: 4-5V

2013

Fig 1: Measuring Voltage Between Heater Control Terminal Of HO2S Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR AMERICA

2014

Refer to appropriate SYSTEM WIRING DIAGRAM article
Is voltage within the specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- 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.