Current Pump Circuit Inspection

IG KEY "OFF".
Disconnect HO2S (S1) connector.
IG KEY "ON" & ENG "OFF".
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 HYUNDAI MOTOR AMERICA
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.