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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostic Codes (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C050C-14: Left Rear Wheel Speed Sensor Circuit Short to Ground or Open [12/2019 - 10/2022] >> Procedure

DTC C050C-14: Left Rear Wheel Speed Sensor Circuit Short to Ground or Open [12/2019 - 10/2022]: Procedure

  1. READ VALUE USING GTS (MOMENTARY INTERRUPTION) 
    1. Select the line graph display on the GTS.
    2. Check for any momentary interruption in the wire harness and connector.

      Refer to DATA LIST / ACTIVE TEST [12/2019 - 11/2023]

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RL Speed Open Rear speed sensor LH open detection Normal / Under intermittent Normal: Momentary interruption not detected
      Under intermittent: Momentary interruption detected      		 -
      RL Speed Sensor Voltage Open Rear speed sensor LH voltage open detection Normal / Under intermittent Normal: Momentary interruption not detected
      Under intermittent: Momentary interruption detected      		 -

      Chassis > Brake/EPB > Data List 

      Tester Display
      RL Speed Open
      RL Speed Sensor Voltage Open

      OK

      Normal (There are no momentary interruptions.)

      NOTE:

      Perform the above inspection before removing the sensor and connector.

      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  2

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

      Result

      Result Proceed to
      for 2WD A
      for AWD B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  3

  3. 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  4

  4. 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  5

  5. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT) 
    1. Reconnect the A39 skid control ECU (brake actuator assembly) connector.
      GTY873509Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      (to Rear Speed Sensor LH (Rear Axle Hub and Bearing Assembly LH))
    2. Reconnect the uM2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      u4-2 (+) - Body ground Ignition switch ON 11 to 14 V

      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 [12/2019 - 10/2022] 

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

  6. 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.

      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
      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)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  7

  7. 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  8

  8. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT) 
    1. Reconnect the A39 skid control ECU (brake actuator assembly) connector.
    2. Reconnect the uM2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.
      GTY873509Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      (to Rear Skid Control Sensor LH)

      Standard Voltage

      Tester Connection Condition Specified Condition
      u4-2 (+) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

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