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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Electronically Controlled Brake System - Diagnostic Codes (1 Of 6)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (except Gasoline Model) >> DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low [12/2023 - ] >> Procedure

DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT SPEED SENSOR LH INSTALLATION 
    1. Check the front speed sensor LH installation.
      GTY1018496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Correct
      *b Incorrect

      OK

      There is no clearance between the front speed sensor LH and front steering knuckle LH.

      The installation bolt is tightened properly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL OR REPLACE FRONT SPEED SENSOR LH 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT SPEED SENSOR LH (CHECK FOR FOREIGN MATTER) 

    Pre-procedure1

    • Check the front speed sensor tip LH.

      OK

      The front speed sensor tip LH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the front speed sensor LH, clean the front speed sensor LH.
      • If the front speed sensor LH is damaged, replace the front speed sensor LH with a new one.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    CLEAN OR REPLACE FRONT SPEED SENSOR LH 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING GTS (FL WHEEL SPEED) 

    Pre-procedure1

    • Perform a road test.
    • Check the front speed sensor LH output value.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      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 mph) When driving at constant speed: No large fluctuations

      Chassis > Brake/EPB > Data List 

      Tester Display
      FL Wheel Speed

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK VEHICLE 

    Result

    Result Proceed to
    w/o AVS A
    w/ AVS B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 

    Pre-procedure1

    • Turn the ignition switch off.
    • Disconnect the B34 No. 2 skid control ECU (brake actuator assembly) connector.
    • Disconnect the B22 front speed sensor LH connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B22-2 (FL+) - B34-22 (FL+) Always Below 1 Ω Ω
      B22-2 (FL+) or B34-22 (FL+) - Body ground Always 10 kΩ or higher kΩ
      B22-1 (FL-) - B34-21 (FL-) Always Below 1 Ω Ω
      B22-1 (FL-) or B34-21 (FL-) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER) 

    Pre-procedure1

    • Check the front speed sensor rotor LH.

      OK

      The front speed sensor rotor LH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the front speed sensor rotor LH, clean the front speed sensor rotor LH.
      • Do not use parts cleaner when cleaning the front speed sensor rotor LH.
      • If the front speed sensor rotor LH is damaged, replace the front speed sensor rotor LH with a new one.

      HINT: 

      The front speed sensor rotor LH is incorporated into the front axle hub sub-assembly LH.

      If the front speed sensor rotor LH needs to be replaced, replace it together with the front axle hub sub-assembly LH.

      Result

      Result Proceed to
      OK A
      NG (The front speed sensor rotor LH is damaged.) B
      NG (There is foreign matter on the front speed sensor rotor LH.) C

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    C 

    CLEAN FRONT SPEED SENSOR ROTOR LH 

  7. CHECK SKID CONTROL SENSOR WITH SUSPENSION CONTROL WIRE LH 

    Pre-procedure1

    • Turn the ignition switch off.
    • Disconnect the B80 and BB1 skid control sensor with suspension control wire LH.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B80-3 (FL+) - BB1-5 (FL+) Always Below 1 Ω Ω
      B80-3 (FL+) or BB1-5 (FL+) - Body ground and other terminals Always 10 kΩ or higher kΩ
      B80-1 (FL-) - BB1-6 (FL-) Always Below 1 Ω Ω
      B80-1 (FL-) or BB1-6 (FL-) - Body ground and other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE SKID CONTROL SENSOR WITH SUSPENSION CONTROL WIRE LH 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WITH SUSPENSION CONTROL WIRE LH - BRAKE ACTUATOR ASSEMBLY) 

    Pre-procedure1

    • Disconnect the B34 No. 2 skid control ECU (brake actuator assembly) connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      BB1-5 (FL+) - B34-22 (FL+) Always Below 1 Ω Ω
      BB1-5 (FL+) or B34-22 (FL+) - Body ground Always 10 kΩ or higher kΩ
      BB1-6 (FL-) - B34-21 (FL-) Always Below 1 Ω Ω
      BB1-6 (FL-) or B34-21 (FL-) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER) 

    Pre-procedure1

    • Check the front speed sensor rotor LH.

      OK

      The front speed sensor rotor LH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the front speed sensor rotor LH, clean the front speed sensor rotor LH.
      • Do not use parts cleaner when cleaning the front speed sensor rotor LH.
      • If the front speed sensor rotor LH is damaged, replace the front speed sensor rotor LH with a new one.

      HINT: 

      The front speed sensor rotor LH is incorporated into the front axle hub sub-assembly LH.

      If the front speed sensor rotor LH needs to be replaced, replace it together with the front axle hub sub-assembly LH.

      Result

      Result Proceed to
      OK A
      NG (The front speed sensor rotor LH is damaged.) B
      NG (There is foreign matter on the front speed sensor rotor LH.) C

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    B 

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    C 

    CLEAN FRONT SPEED SENSOR ROTOR LH 

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