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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C050C-23: Left Rear Wheel Speed Sensor Signal Stuck Low [10/2022 - 11/2023] >> Procedure

DTC C050C-23: Left Rear Wheel Speed Sensor Signal Stuck Low [10/2022 - 11/2023]: Procedure

  1. CHECK VEHICLE SPECIFICATION 
    1. Check the vehicle specification.

      Result

      Result Proceed to
      for AWD A
      for 2WD B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  2

  2. CHECK REAR SKID CONTROL SENSOR LH INSTALLATION 
    1. Check the rear skid control sensor LH installation.
      GTY453396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Skid Control Sensor LH
      *a Correct
      *b Incorrect
      *c 8.5 N.m (87 kgf/cm, 75 in.lbf)
      *d No clearance

      OK

      There is no clearance between the rear skid control sensor LH and the rear axle carrier LH.

      The installation bolt is tightened properly.

      Torque 

      8.5 N.m (87 kgf/cm, 75 in.lbf)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL OR REPLACE REAR SKID CONTROL SENSOR LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK REAR SKID CONTROL SENSOR LH (CHECK FOR FOREIGN MATTER) 
    1. Remove the rear skid control sensor LH.

      Refer to REMOVAL [12/2019 - ]

    2. Check the rear skid control sensor tip LH.

      OK

      The rear skid control sensor tip LH is free of scratches, oil, and foreign matter.

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CLEAN OR REPLACE REAR SKID CONTROL SENSOR LH 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING GTS (RL WHEEL SPEED) 
    1. Start the engine.
    2. Perform a road test.
    3. Check the rear skid control sensor LH output value.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RL Wheel Speed Rear 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

      Chassis > Brake/EPB > Data List 

      Tester Display
      RL Wheel Speed

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  5

  5. INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY 
    1. Turn the ignition switch off.
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the u4 and uM2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.
      GTY1178001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      *b Front view of wire harness connector
      (to Sensor Side Connector)
      *c Front view of wire harness connector
      (to Vehicle Side Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      u4-1 (+) - uM2-3 (RL+) Always Below 1 Ω
      u4-1 (+) or uM2-3 (RL+) - Body ground and other terminals Always 10 kΩ or higher
      u4-2 (-) - uM2-4 (RL-) Always Below 1 Ω
      u4-2 (-) or uM2-4 (RL-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      uM2-3 (RL+) - A39-5 (RL+) Always Below 1 Ω
      uM2-3 (RL+) or A39-5 (RL+) - Body ground Always 10 kΩ or higher
      uM2-4 (RL-) - A39-4 (RL-) Always Below 1 Ω
      uM2-4 (RL-) or A39-4 (RL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK REAR SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER) 
    1. Remove the component with the rear speed sensor rotor LH.

      Refer to REMOVAL [10/2022 - 11/2023]

    2. Check the rear speed sensor rotor LH.

      OK

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

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

      HINT: 

      • The rear speed sensor rotor LH is incorporated into the rear axle hub and bearing assembly LH.
      • If the rear speed sensor rotor LH needs to be replaced, replace it together with the rear axle hub and bearing assembly LH.

      Result

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

    Result: 

    A 

    REPLACE REAR SKID CONTROL SENSOR LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    B 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    C 

    CLEAN REAR SPEED SENSOR ROTOR LH 

  8. CHECK REAR SPEED SENSOR LH INSTALLATION 
    1. Check the rear speed sensor LH installation.
      GTY423344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor LH
      *a Correct
      *b Incorrect
      *c No clearance

      OK

      There is no clearance between the rear speed sensor LH and the rear axle hub and bearing assembly LH.

      HINT: 

      Because the rear axle hub and bearing assembly LH cannot be disassembled, if the rear speed sensor LH needs replacement, replace the rear axle hub and bearing assembly LH.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    OK 

    See step  9

  9. READ VALUE USING GTS (RL WHEEL SPEED) 
    1. Start the engine.
    2. Perform a road test.
    3. Check the rear speed sensor LH output value.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RL Wheel Speed Rear 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

      Chassis > Brake/EPB > Data List 

      Tester Display
      RL Wheel Speed

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  10

  10. INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY 
    1. Turn the ignition switch off.
      GTY868288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      *b Front view of wire harness connector
      (to Sensor Side Connector)
      *c Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the u4 and uM2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      u4-2 (+) - uM2-3 (RL+) Always Below 1 Ω
      u4-2 (+) or uM2-3 (RL+) - Body ground and other terminals Always 10 kΩ or higher
      u4-1 (-) - uM2-4 (RL-) Always Below 1 Ω
      u4-1 (-) or uM2-4 (RL-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      uM2-3 (RL+) - A39-5 (RL+) Always Below 1 Ω
      uM2-3 (RL+) or A39-5 (RL+) - Body ground Always 10 kΩ or higher
      uM2-4 (RL-) - A39-4 (RL-) Always Below 1 Ω
      uM2-4 (RL-) or A39-4 (RL-) - Body ground Always 10 kΩ or higher

      HINT: 

      • The rear speed sensor LH is incorporated into the rear axle hub and bearing assembly LH.
      • If the rear speed sensor LH needs to be replaced, replace the rear axle hub and bearing assembly LH.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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