DSD Information System
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 C0506-14: Right Front Wheel Speed Sensor Circuit Short to Ground or Open [12/2019 - ] >> Procedure

DTC C0506-14: Right Front Wheel Speed Sensor Circuit Short to Ground or Open [12/2019 - ]: 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] , or refer to DATA LIST / ACTIVE TEST [11/2023 - ]

      Chassis > Brake/EPB > Data List 

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

      Chassis > Brake/EPB > Data List 

      Tester Display
      FR Speed Open
      FR 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 HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - BRAKE ACTUATOR 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 A40 front speed sensor RH connector.
    4. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    5. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A40-1 (FR+) - A39-7 (FR+) Always Below 1 Ω
      A40-1 (FR+) or A39-7 (FR+) - Body ground Always 10 kΩ or higher
      A40-2 (FR-) - A39-6 (FR-) Always Below 1 Ω
      A40-2 (FR-) or A39-6 (FR-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT) 
    1. Reconnect the A39 skid control ECU (brake actuator assembly) connector.
      GTY902721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Front Speed Sensor RH)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A40-1 (FR+) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR RH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Diesel-Data.com