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Home >> Lexus >> 2019 >> LC 500 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (Coupe) (4 Of 4) & Symptom Tests >> Electronically Controlled Brake System >> DTC C1464-31: Front Speed Sensor RH Circuit; DTC C1465-32: Front Speed Sensor LH Circuit [03/2017 - 09/2018] >> Procedure

DTC C1464-31: Front Speed Sensor RH Circuit; DTC C1465-32: Front Speed Sensor LH Circuit [03/2017 - 09/2018]: Procedure

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [03/2017 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Speed Open Front speed sensor RH open detection Error or Normal Error: Momentary interruption
      Normal: Normal      		 -
      FL Speed Open Front speed sensor LH open detection Error or Normal Error: Momentary interruption
      Normal: Normal      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      FR Speed Open
      FL Speed Open

      OK

      There are no momentary interruptions.

      HINT: 

      Perform the above inspection before removing the sensor and connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) 
    1. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Wheel Speed Front speed sensor RH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front speed sensor LH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
    2. Check the speed value output from the speed sensor displayed on the Techstream.

      OK

      The speed value output from the speed sensor displayed on the Techstream is similar to the speed indicated on the speedometer.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK) 
    1. Turn the engine switch off.
    2. Using the Techstream, perform a Test Mode (signal check) inspection sensor check and check that all Test Mode (signal check) inspection items change from incomplete to complete.

      Refer to TEST MODE PROCEDURE [03/2017 - 05/2023]

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Signal Check

      OK

      All Test Mode (signal check) inspection items change from incomplete to complete.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the engine switch off.
    3. Start the engine.
    4. Perform a road test.
    5. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1464/31 and C1465/32 are not output. A
      DTCs C1464/31 and/or C1465/32 are output. B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

    Result: 

    B 

    See step  8

  5. CHECK FRONT SPEED SENSOR INSTALLATION 
    1. Turn the engine switch off.
      GTY823872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Speed Sensor
      *a OK
      *b NG
    2. Check the speed sensor installation.

      OK

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

      The installation bolt is tightened properly.

      Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf) 

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    OK 

    See step  6

  6. INSPECT FRONT SKID CONTROL SENSOR WIRE 
    GTY817523Courtesy 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 Vehicle Side Connector)
    *b Front view of wire harness connector
    (to Sensor Side Connector)
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    2. Remove the front skid control sensor wire.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      z36-2 (FR+) - A82-5 (FR+) Always Below 1 Ω
      z36-2 (FR+) or A82-5 (FR+) - Body ground and other terminals Always 10 MΩ or higher
      z36-1 (FR-) - A82-1 (FR-) Always Below 1 Ω
      z36-1 (FR-) or A82-1 (FR-) - Body ground and other terminals Always 10 MΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      r1-2 (FL+) - Ar1-3 Always Below 1 Ω
      r1-2 (FL+) or Ar1-3 - Body ground and other terminals Always 10 MΩ or higher
      r1-1 (FL-) - Ar1-1 Always Below 1 Ω
      r1-1 (FL-) or Ar1-1 - Body ground and other terminals Always 10 MΩ or higher
      NOTE:

      Check the speed sensor signal after replacement.

      Refer to TEST MODE PROCEDURE [03/2017 - 05/2023]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT SKID CONTROL SENSOR WIRE. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - FRONT SKID CONTROL SENSOR WIRE) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    2. Disconnect the A8 and A10 skid control ECU assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      A8-22 (FR+) - A82-5 (FR+) Always Below 1 Ω
      A8-22 (FR+) or A82-5 (FR+) - Body ground Always 10 MΩ or higher
      A8-23 (FR-) - A82-1 (FR-) Always Below 1 Ω
      A8-23 (FR-) or A82-1 (FR-) - Body ground Always 10 MΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      A10-31 (FL+) - Ar1-3 Always Below 1 Ω
      A10-31 (FL+) or Ar1-3 - Body ground Always 10 MΩ or higher
      A10-32 (FL-) - Ar1-1 Always Below 1 Ω
      A10-32 (FL-) or Ar1-1 - Body ground Always 10 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS 
    1. Reconnect the A8 and A10 skid control ECU assembly connectors.
      GTY814746Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Skid Control ECU Assembly)
      *b Normal Signal Waveform
    2. Install the front skid control sensor wire.
    3. Connect an oscilloscope to the front speed sensor terminal of the skid control ECU assembly and body ground.
    4. Check the waveform output when the wheels are rotated.

      OK

      The same waveform is output from all the sensors and there is no noise or interference in the waveform.

      NOTE:

      Check the speed sensor signal after cleaning or replacement.

      Refer to TEST MODE PROCEDURE [03/2017 - 05/2023]

      HINT: 

      • As the vehicle speed (wheel revolution speed) increases, the waveform cycle narrows.
      • When noise is identified in the waveform on the oscilloscope, the erratic signals are likely due to speed sensor rotor scratches, looseness or attached foreign matter.
      • The front speed sensor and front speed sensor rotor is incorporated into the front axle hub sub-assembly.

        If the front speed sensor and front speed sensor rotor needs to be replaced, replace the front axle hub sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT SKID CONTROL SENSOR WIRE. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    OK 

    See step  9

  9. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the engine switch off.
    3. Start the engine.
    4. Perform a road test.
    5. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1464/31 and/or C1465/32 are output. A
      DTCs C1464/31 and C1465/32 are not output. B

    Result: 

    A 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

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