Control Circuit Inspection

Measure voltage between control terminal of the HO2S heater harness connector and chassis ground.
Specification: Approx. 4 ~ 5 V

Fig 1: Measuring Voltage Between Control Terminal Of HO2S Heater Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
Is voltage within specification?
YES
- Go to next step as below.
NO
- Repair or replace as necessary and go to VERIFICATION OF VEHICLE REPAIR .
  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.