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Home >> Hyundai >> 2004 >> Accent GL, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) >> DTC Troubleshooting Procedures >> DTC P0030: O2 Sensor Heater Control Circuit (Bank 1/Sensor 1) >> Power Circuit Inspection
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Power Circuit Inspection

  1. Ignition "OFF"
  2. Disconnect HO2S sensor connector.
  3. Ignition "ON" & Engine "OFF"
  4. 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
    G03851672Courtesy of HYUNDAI MOTOR CO.
  5. Is measure voltage within Specification?

    YES 

    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.
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