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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 84 (HEV Control System Diagnosis (HEV)) >> DTC P0504: Brake Switch 'A' 'B' Correlation >> Scantool Diagnostics >> Monitor DTC Status

Monitor DTC Status

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  1. Ignition ON (SSB LED "BLUE") & Vehicle "STOP".
  2. Connect GDS and select "DTC Analysis" mode.
  3. Click "DTC Status" on the menu bar to view DTC information.
  4. Confirm that the "DTC Readiness Flag" indicates "COMPLETED". If not, drive the vehicle within conditions noted in Freeze Frame Data or Enable Conditions.
  5. Read the "DTC Status" parameter.
    Fig 1: Screen Display - DTC Status
    G10602106Courtesy of HYUNDAI MOTOR AMERICA
  6. Is parameter displayed "Present Fault"?

    YES 

    • Go to Next procedure.

    NO 

    • Fault is intermittent caused by poor contact in the sensor's and/or Control module's connector or was repaired and Control module's memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Fig 2: Power Relay Assembly
G10602107Courtesy of HYUNDAI MOTOR AMERICA