Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect HO2S (B1/S2) connector.
2. IG "ON".
3. Measure voltage between signal terminal of HO2S (B1/S2) harness connector and chassis ground.
  Specification : Approx. 0.6~0.9V
  
  Fig 1: Measuring Voltage Between Signal Terminal Of HO2S (B1/S2) Connector & Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured voltage within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Repair open in harness, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.