Signal Circuit Inspection

■ Check Open or Short in Signal Circuit 

1. IG KEY "OFF".
2. Disconnect HO2S (S2) connector.
3. IG KEY "ON" & ENG "OFF".
4. Measure the voltage between signal terminal of HO2S (S2) harness connector and chassis ground.

   Specification:  Approx 0.45V

   Fig 1: Measuring Voltage Between Signal Terminal Of HO2S (S2) Harness Connector And Chassis Ground

   Courtesy of KIA MOTORS AMERICA, INC.
   Fig 2: HO2S Signal Connector Terminal

   Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured voltage within specification?

   YES 

   • Go to "GROUND CIRCUIT INSPECTION " procedure.

   NO 

   • Repair Open or Short circuit and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.