2004 Hyundai Tiburon Base, StandardFACTORY OEM SERVICE PROCEDURE

Inspection Procedures

  1. CHECK HO2S AND ECM CONNECTORS
    1. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

      Are all connectors good? 

    Yes: Go to next

    No: Repair or replace it.

  2. CHECK FOR SHORT TO POWER IN HARNESS
    1. Turn ignition switch to OFF position and disconnect HO2S connector.
    2. Turn ignition switch to ON position.
    3. Measure voltage of HO2S signal harness between terminal 2 of the HO2S harness connector and chassis ground.
    Fig 1: Measuring Voltage Of HO2S Signal Harness Between Terminal 2 Of HO2S Harness Connector & Chassis Ground
    G00883945Courtesy of HYUNDAI MOTOR CO.
    • Specification: below 0.5V 

    Is voltage within specification? 

    Yes: Go to next

    No: Repair short to power in harness.

  3. CHECK HO2S SIGNAL WAVEFORM
    1. Reconnect the HO2S and ECM connectors.
    2. Warm up the engine to normal operating temperature.
    3. Using a Hi-Scan (Pro), monitor the HO2S signal waveform.

    Do the rear HO2S signals fluctuate between 0V and 1V? 

    Yes: Proceed with ECM PROBLEM PROCEDURE  .

    No: Replace HO2S.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.