Control Circuit Inspection

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

Fig 1: Measuring Voltage Between Control Terminal Of HO2S Heater Harness Connector And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is voltage within specification?
YES
- Go to next step as below.
NO
- Repair or replace 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.