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Home >> Hyundai >> 2017 >> Azera Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 3) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Scantool Diagnostics >> Monitor GDS Data
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Monitor GDS Data

  1. Connect GDS to Data Link Connector (DLC).
  2. IG "ON".
  3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
  4. Read "DTC Status" parameter.
    Fig 1: Screen Display - DTC Status Parameter
    G12088170Courtesy of HYUNDAI MOTOR AMERICA
  5. Is parameter displayed "Present fault"?

    YES 

    • Substitute with a known - good Catalyst Converter and check for proper operation. If the problem is corrected, Go to "Verification of Vehicle Repair " procedure.

    NO 

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