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Home >> Hyundai >> 2004 >> Tiburon GT, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System (2.7L) >> DTC Troubleshooting Procedures >> Siemens Ems >> DTC P0038: O2 Sensor Heater Circuit High Input (Bank 1, Sensor 2) >> Inspection Procedures

Inspection Procedures

  1. CHECK HO2S AND ECM CONNECTORS 
    1. Check HO2S and ECM for poor connection, misplaced, bent, loose or corroded terminals.

    Are both connectors good? 

    Yes: Go to next step.

    No: Repair or replace it.

  2. CHECK HO2S HEATER RESISTANCE 
    1. Turn ignition switch to OFF and disconnect HO2S connector.
    2. Measure resistance between the terminals 3 and 4 of HO2S connector.
    Fig 1: Measuring Resistance Between Terminals 3 & 4 Of HO2S Connector
    G00884349Courtesy of HYUNDAI MOTOR CO.
    • 3 ~ 4 Ω at between 18°C and 28°C (64°F ~ 82°F) 

    Is resistance within specifications? 

    Yes: Go to next step.

    No: Replace HO2S.

  3. CHECK POWER TO HO2S HEATER 
    1. Turn ignition switch to ON.
    2. Measure voltage between the terminal 3 of HO2S harness connector and chassis ground.
    Fig 2: Measuring Voltage Between Terminal 3 Of HO2S Harness Connector & Chassis Ground
    G00884350Courtesy of HYUNDAI MOTOR CO.
    • Specification: approximately B+ 

    Is voltage within specification? 

    Yes: Go to next step.

    No: Repair open or short to ground in harness.

  4. CHECK FOR SHORT TO POWER IN HARNESS 
    1. Turn ignition switch to OFF.
    2. Disconnect ECM and HO2S connectors.
    3. Turn ignition switch to ON.
    4. Measure voltage between the terminal 4 of HO2S harness connector and chassis ground.
    Fig 3: Measuring Voltage Between Terminal 4 Of HO2S Harness Connector & Chassis Ground
    G00884351Courtesy of HYUNDAI MOTOR CO.
    • Specification: below 0.5V 

    Is voltage within specification? 

    Yes: Go to next step.

    No: Repair short to power in harness.

  5. CHECK FOR OPEN IN HARNESS 
  1. Turn ignition switch to OFF.
  2. Measure resistance between the terminals 4 of HO2S harness connector and 7 of ECM harness connector C133-2.
Fig 4: Measuring Resistance Between Terminals 4 Of HO2S Harness Connector & 7 Of ECM Harness Connector C133-2
G00884352Courtesy of HYUNDAI MOTOR CO.

Does resistance indicate continuity? 

Yes: Proceed with ECM PROBLEM PROCEDURE .

No: Repair open in harness.

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