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Home >> Hyundai >> 2004 >> Tiburon Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System (2.0L) >> DTC Troubleshooting Procedures >> DTC P0136: O2 Sensor Circuit Open Check (Bank 1, Sensor 2) >> Inspection Procedures

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 OPEN IN HARNESS
    1. Turn ignition switch to OFF position and disconnect HO2S and ECM connector.
    2. Measure resistance between terminal 1 of the HO2S harness connector and terminal 37 of the ECM harness connector.
    3. Measure resistance between terminal 2 of the HO2S harness connector and terminal 42 of the ECM harness connector.
    Fig 1: Measuring Resistance Between Terminal Of HO2S Harness Connector & Terminal Of ECM Harness Connector
    G00883939Courtesy of HYUNDAI MOTOR CO.
    • Specifications: below 1ohm 

    Does each resistance indicate open? 

    Yes: Go to next

    No: Repair open 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.

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