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Home >> Toyota >> 2016 >> 4Runner Trail >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Vehicle Stability Control System (For Vacuum Brake Booster) - Diagnostic Codes (C0040-C137B) >> VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) >> DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low; DTC C0506-23: Right Front Wheel Speed Sensor Signal Stuck Low [08/2019 - ] >> Procedure

DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low; DTC C0506-23: Right Front Wheel Speed Sensor Signal Stuck Low [08/2019 - ]: Procedure

  1. CHECK FRONT SPEED SENSOR INSTALLATION 
    1. Turn the ignition switch off.
    2. Check the speed sensor installation.

      Refer to INSTALLATION [08/2015 - ]

      OK

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

      The installation bolt is tightened properly.

      GTY361898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Normal
      *b Abnormal
      *c Clearance

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL FRONT SPEED SENSOR CORRECTLY. Refer to  INSTALLATION [08/2015 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT SPEED SENSOR (CHECK FOR FOREIGN MATTER) 
    1. Remove the front speed sensor.

      Refer to REMOVAL [08/2015 - ]

    2. Check the speed sensor tip.

      OK

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

      NOTE:
      • If there is oil or foreign matter on the speed sensor, clean the speed sensor.
      • If the speed sensor is damaged, replace the speed sensor with a new one.
      • Check the speed sensor signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [08/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CLEAN OR REPLACE FRONT SPEED SENSOR 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Brake / Data List.
    5. According to the display on the Techstream, read the Data List.
      CHASSIS > BRAKE > 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 (0.0 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 (0.0 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
    6. Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

      HINT: 

      Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart.

      Refer to OPERATION CHECK [08/2019 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 08/2022] , or refer to OPERATION CHECK [08/2022 - ]

      OK

      The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

      HINT: 

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

      Refer to PROBLEM SYMPTOMS TABLE [08/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

    Result: 

    NG 

    See step  4

  4. INSPECT FRONT SKID CONTROL SENSOR WIRE 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    2. Disconnect the Az2 or Az3 front skid control sensor wire connector.
    3. Disconnect the z5 or z6 front skid control sensor wire connector.
    4. Measure the resistance according to the value(s) in the table below.
      GTY933457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for RH *B for LH
      *1 Front Skid Control Sensor Wire - -
      *a Front view of wire harness connector
      (to Front Speed Sensor Side Connector)      		 *b Front view of wire harness connector
      (to Vehicle Side Connector)

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      Az2-2 - z5-2 (FR+) Always Below 1 Ω
      Az2-2 or z5-2 (FR+) - Body ground Always 10 kΩ or higher
      Az2-1 - z5-1 (FR-) Always Below 1 Ω
      Az2-1 or z5-1 (FR-) - Body ground Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      Az3-2 - z6-2 (FL+) Always Below 1 Ω
      Az3-2 or z6-2 (FL+) - Body ground Always 10 kΩ or higher
      Az3-1 - z6-1 (FL-) Always Below 1 Ω
      Az3-1 or z6-1 (FL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT SKID CONTROL SENSOR WIRE. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    2. Reconnect the Az2 or Az3 front skid control sensor wire connector.
    3. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      A58-31 (FR+) - z5-2 (FR+) Always Below 1 Ω
      A58-31 (FR+) or z5-2 (FR+) - Body ground Always 10 kΩ or higher
      A58-30 (FR-) - z5-1 (FR-) Always Below 1 Ω
      A58-30 (FR-) or z5-1 (FR-) - Body ground Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      A58-18 (FL+) - z6-2 (FL+) Always Below 1 Ω
      A58-18 (FL+) or z6-2 (FL+) - Body ground Always 10 kΩ or higher
      A58-17 (FL-) - z6-1 (FL-) Always Below 1 Ω
      A58-17 (FL-) or z6-1 (FL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK FRONT SPEED SENSOR ROTOR (CHECK FOR FOREIGN MATTER) 
    1. Remove the component with the speed sensor rotor.

      Refer to REMOVAL [08/2015 - ]

    2. Check the speed sensor rotor.

      OK

      The rotor is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the speed sensor rotor, clean the speed sensor rotor.
      • If the speed sensor rotor is damaged, replace the speed sensor rotor with a new one.
      • Check the speed sensor signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [08/2019 - ]

      HINT: 

      • The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
      • If the front speed sensor rotor needs to be replaced, replace it together with the front axle with ABS rotor bearing assembly

      Result

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

    Result: 

    A 

    REPLACE FRONT SPEED SENSOR. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    B 

    REPLACE FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    C 

    CLEAN FRONT SPEED SENSOR ROTOR 

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