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Home >> Lexus >> 2020 >> UX 200 Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Diagnostic Codes (2 Of 2) & Circuit Tests) (Except Hybrid) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C124E-62: Wheel Speed Sensor Signal Compare Failure [10/2018 - 07/2022] >> Procedure

DTC C124E-62: Wheel Speed Sensor Signal Compare Failure [10/2018 - 07/2022]: Procedure

  1. CHECK DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

      Chassis > Brake/EPB > Trouble Codes 

    4. Check the details of the DTCs.

      HINT: 

      When DTC C0500-1C, C0506-1C, C050C-1C and/or C0512-1C are output together with DTC C124E-62, inspect and repair the trouble areas indicated by DTC C0500-1C, C0506-1C, C050C-1C and/or C0512-1C first.

      Result

      Result Proceed to
      C124E-62 and C0500-1C, C0506-1C, C050C-1C and/or C0512-1C are output simultaneously A
      C124E-62 is output B

    Result: 

    A 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - 07/2022] 

    Result: 

    B 

    See step  2

  2. PRE-CHECK 
    1. Check that all 4 tires are of correct size, are inflated to the correct pressure, and do not show excessive signs of wear.

      Refer to INSPECTION [10/2018 - 07/2022]

      HINT: 

      If a tire is deformed or an incorrectly sized tire or wheel is installed, this DTC may be stored.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK FREEZE FRAME DATA (WHEEL SPEED AND VEHICLE SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
    4. Select a DTC to display the Freeze Frame Data.
    5. Read the freeze frame data of DTC C124E-62.

      Chassis > Brake/EPB 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front wheel speed sensor LH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      RL Wheel Speed Rear wheel speed sensor LH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      Vehicle Speed Vehicle speed (vehicle speed used for each control) Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations

      Chassis > Brake/EPB > DTC(C124E-62) > Freeze Frame Data 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed
      Vehicle Speed

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. READ VALUE USING TECHSTREAM (WHEEL SPEED AND VEHICLE SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Enter the following menus: Chassis / Brake/EPB / Data List.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front wheel speed sensor LH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      RL Wheel Speed Rear wheel speed sensor LH reading Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      Vehicle Speed Vehicle speed Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations
      Vehicle Speed Vehicle speed (vehicle speed used for each control) Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) Vehicle stopped: 0.0 km/h (0.0 mph) When driving at constant speed: No large fluctuations

      Chassis > Brake/EPB > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed
      Vehicle Speed
      Vehicle Speed
    4. Start the engine.
    5. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
    6. Check the value of Wheel Speed and Vehicle Speed.

      OK

      The value of each Wheel Speed and Vehicle Speed changes in accordance with vehicle speed and the maximum difference between any 2 sensors is less than 6%.

      HINT: 

      If the result of the road test is within the specified range, it is possible that this DTC was stored due to a particular situation.

      Using to the freeze frame data, the approximate vehicle conditions that were present when the DTC was stored can be determined.

      Refer to FREEZE FRAME DATA [10/2018 - 07/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

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