Signal Circuit Inspection

IG "OFF" and disconnect HO2S(B1/S2) connector.
IG "ON".
Measure voltage between signal terminal of HO2S(B1/S2) harness connector and chassis ground.
Specification:

Approx. 2.0~2.4V - when pumping current is ON

Approx. 0.6~0.9V - when pumping current is OFF

Fig 1: Measuring Voltage Between Signal Terminal Of HO2S(B1/S2) 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 " procedure.