Current Pump Circuit Inspection

■ Check Open or Short in signal circuit 

1. IG KEY "OFF".
2. Disconnect HO2S (S1) connector.
3. IG KEY "ON" & ENG "OFF".
4. Measure the voltage between Current Pump terminal of HO2S (S1) harness connector and chassis ground.

   Specification:  Approx 2.8V

   Fig 1: Measuring Voltage Between Current Pump Terminal Of HO2S (S1) Harness Connector And Chassis Ground

   Courtesy of KIA MOTORS AMERICA, INC.
   Fig 2: HO2S (S1) Harness Connector Terminals

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

   YES 

   • Go to "COMPONENT INSPECTION " procedure.

   NO 

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