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Home >> Lexus >> 2023 >> NX 250 AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (3 Of 3), Symptom Tests & Circuit Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> FL Speed Sensor Wrong Installation (X0451) [11/2021 - ] >> Procedure

FL Speed Sensor Wrong Installation (X0451) [11/2021 - ]: Procedure

  1. CHECK FOR DTCs (HEALTH CHECK) 
    1. Perform the Health Check using the GTS.

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer To  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - ] 

    Result: 

    A 

    See step  2

  2. CHECK PART NUMBER (FRONT SPEED SENSOR LH) 
    1. Check that the front speed sensor LH is installed.

      OK

      Proper front speed sensor LH is installed.

      NOTE:

      If it is necessary to remove components in order to check the front speed sensor LH, follow the relevant installation and removal procedures and precautions for those components.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT SPEED SENSOR LH 

    w/o AVS: Refer to REMOVAL [11/2021 - 03/2024] , or refer to REMOVAL [03/2024 - ]

    w/ AVS: Refer to REMOVAL [11/2021 - 03/2024] , or refer to REMOVAL [03/2024 - ]

    Result: 

    OK 

    See step  3

  3. CLEAR VEHICLE CONTROL HISTORY (RoB) 
    1. Using the GTS, clear the Vehicle Control History (RoB).

      Chassis > Brake/EPB > Utility 

      Tester Display
      Vehicle Control History (RoB)

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK VEHICLE CONTROL HISTORY (RoB) 
    1. Using the GTS, check for Vehicle Control History (RoB).

      Chassis > Brake/EPB > Utility 

      Tester Display
      Vehicle Control History (RoB)

      Result

      Result Proceed to
      X0451 is not output A
      X0451 is output B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

    Result: 

    B 

    REPLACE FRONT SPEED SENSOR LH 

    w/o AVS: Refer to REMOVAL [11/2021 - 03/2024] , or refer to REMOVAL [03/2024 - ]

    w/ AVS: Refer to REMOVAL [11/2021 - 03/2024] , or refer to REMOVAL [03/2024 - ]