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Home >> Hyundai >> 2009 >> Elantra GLS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures >> DTC P0030 Ho2S Heater Control Circuit (Bank 1/Sensor 1) >> Power Circuit Inspection

Power Circuit Inspection

  1. Ignition "OFF"
  2. Disconnect HO2S connector.
  3. Ignition "ON" & Engine "OFF"
  4. Measure voltage between terminal 5 of the HO2S heater harness connector and chassis ground.

    Specification:  B+

  5. Is voltage within the specification?

    YES 

    NO 

    • Check for an open in the power supply circuit between the main relay and the HO2S.
    • Especially check for "SENSOR2 FUSE 15A" is installed and not blown.
    • Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire (s). Do not attempt to repair the wire (s), connector, or the terminals.
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