Signal Circuit Inspection

IG "OFF" and disconnect HO2S (B2/S1) connector.
IG "ON" and ENG "OFF"
Measure voltage between termianl 3 of HO2S (B2/S1) harness connector and chassis ground.
Specification : Approx. 3.5V - when pumping current is ON

Approx. 0.45V - when pumping current is OFF

Fig 1: Measuring Voltage Between Termianl 3 Of HO2S (B2/S1) Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
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 " prcedure.