Ground Circuit inspection

IG "ON" and disconnect HO2S (B1/S2) connector.
Measure voltage between terminal 3 of HO2S (B1/S2) harness connector and chassis ground.
Measure voltage between terminals 3 and 4 of HO2S (B1/S2) harness connector.
Specification : Voltage difference between measurement "A" and "B" is below 200mV.

Fig 1: Measuring Voltage Between Terminal 3 Of HO2S (B1/S2) Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR CO.

Fig 2: Measuring Voltage Between Terminals 3 And 4 Of HO2S (B1/S2) Harness Connector
Courtesy of HYUNDAI MOTOR CO.
Is the measured voltage within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair open or contact resistance in harness, and go to "VERIFICATION OF VEHICLE REPAIR " prcedure.