Power Circuit Inspection

Ignition "OFF"
Disconnect HO2S sensor connector.
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 4 of sensor harness connector and chassis ground.
Specification: approximately B+

Fig 1: Measuring Voltage Between Terminal 4 Of Sensor Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
Is measure voltage within Specification?
YES
- Go to "CONTROL CIRCUIT INSPECTION " procedure.
NO
- Open or short circuit to chassis ground between HO2S harness connector and control relay.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

NOTE: In case, when checking sensor voltage, the output voltage is 0V.

Possible cause: Blown fuse or open circuit in harness between E/C-J/BOX and terminal 4 of HO2S heater.