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Inspection Procedures

WARNING: This page is about a different car, the 2004 Hyundai Tiburon. However, it is still accessible from the selected car via links, so may be relevant.
  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
    G00884341Courtesy of HYUNDAI MOTOR CO.
    • 3 ~ 4 Ω at between 18°C and 28°C (64°F ~ 82°F) 

    Is resistance within specification? 

    Yes: Go to next step.

    No: Replace HO2S.

  3. VISUALLY CHECK HO2S FOR CONDITIONS 
    1. Remove HO2S.
    2. Thoroughly check HO2S for contamination, deterioration or damage.

    Is HO2S contaminated, deteriorated or damaged? 

    Yes: Proceed with ECM PROBLEM PROCEDURE .

    Yes: Clean or replace HO2S.

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