Signal Circuit Inspection

Ignition "ON" & Engine "OFF".
Measure voltage between signal terminal of HO2S(B1S2) harness connector and chassis ground.
Specification : Approx. 0.4~0.5V

Fig 1: Measuring Voltage Between HO2S(B1S2) Harness Connector Signal Terminal And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is voltage within the 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.