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Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Brake Control >> VEHICLE STABILITY CONTROL SYSTEM (w/o VDIM) >> DTC C0200/31 Front Speed Sensor RH Circuit; DTC C0205/32 Front Speed Sensor LH Circuit; DTC C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) >> Inspection Procedure
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Inspection Procedure

NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).
  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See CHECK FOR INTERMITTENT PROBLEMS  ).

      ABS/VSC/TRAC: 

      MEASUREMENT ITEM / RANGE CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      FR Speed Open FR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal
      FL Speed Open FL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal

      Result 

      RESULT REFERENCE CHART

      Condition Proceed to
      There are no momentary interruptions A
      There are momentary interruptions B
      There is a constant open circuit C

      HINT:

      Perform the above inspection before removing the sensor and connector.

    B:  Go to step  13

    C:  Go to step  5

    A: Go to next step 

  2. READ VALUE OF TECHSTREAM (FRONT SPEED SENSOR) 
    1. Connect Techstream to the DLC3.
    2. Start the engine.
    3. Select the Data List mode on Techstream.

      ABS / VSC / TRAC: 

      MEASUREMENT ITEM / RANGE CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      FR Wheel Speed FR wheel speed sensor reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed
      FL Wheel Speed FL wheel speed sensor reading /min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed
    4. Check that there is no difference between the speed value output from the speed sensor displayed on Techstream and the speed value displayed on the speedometer when driving the vehicle.

      OK: 

      The speed value output from the speed sensor displayed on Techstream is the same as the actual vehicle speed. 

      ABS/VSC/TRAC: 

      MEASUREMENT ITEM / RANGE CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      FR Wheel Direction FR wheel direction / FORWARD or BACK FORWARD: Forward
      BACK: Back
      FL Wheel Direction FL wheel direction / FORWARD or BACK FORWARD: Forward
      BACK: Back
    5. Check that the sensor signal conforms to the wheel direction.

      OK: 

      The wheel direction is displayed. 

    NG:  Go to step  5

    OK: Go to next step 

  3. PERFORM TEST MODE (SIGNAL CHECK) 
    1. Perform sensor signal check in Test Mode Procedure (See TEST MODE PROCEDURE  ).

      OK: 

      All Test Mode DTCs are erased. 

    NG:  Go to step  5

    OK: Go to next step 

  4. RECONFIRM DTC 
    1. Clear the DTC (See FREEZE FRAME DATA  ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.
    4. Check if the same DTC is recorded (See FREEZE FRAME DATA  ).

      Result 

      RESULT REFERENCE CHART

      Condition Proceed to
      DTCs (C0200/31 and/or C0205/32) are not output A
      DTCs (C0200/31 and/or C0205/32) are output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B:  Go to step  11

    A: USE SIMULATION METHOD TO CHECK 

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

      OK (2WD): 

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

      OK (4WD): 

      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) 

      Fig 1: Checking Front Speed Sensor Installation
      G05830667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE CHART

      Result Proceed to
      OK (for4WD) A
      OK (for 2WD) B
      NG C
      NOTE: Check the speed sensor signal after the replacement (See TEST MODE PROCEDURE  ).

    B:  Go to step  7

    C: INSTALL FRONT SPEED SENSOR CORRECTLY 

    A: Go to next step 

  6. CHECK FRONT SPEED SENSOR TIP 
    1. Remove the front speed sensor (See REMOVAL  ).
    2. Check the speed sensor tip.

      OK: 

      No scratches or foreign matter on the sensor tip. 

      NOTE: Check the speed sensor signal after the cleaning/ replacement (See TEST MODE PROCEDURE  ).

    NG: CLEAN OR REPLACE FRONT SPEED SENSOR 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) 
    1. Install the front speed sensor.
    2. Disconnect the skid control sensor wire.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      RH 

      STANDARD RESISTANCE REFERENCE CHART

      Tester Connection Condition Specified Condition
      V1 ("A"-2) - V1 ("B"-1) Always Below 1 Ω
      V1 ("A"-2) - V1 ("B"-2) Always 10 kΩ or higher
      V1 ("A"-2) - Body ground Always 10 kΩ or higher
      V1 ("A"-1) - V1 ("B"-2) Always Below 1 Ω
      V1 ("A"-1) - V1 ("B"-1) Always 10 kΩ or higher
      V1 ("A"-1) - Body ground Always 10 kΩ or higher

      LH 

      STANDARD RESISTANCE REFERENCE CHART

      Tester Connection Condition Specified Condition
      W1 ("A"-2) - W1 ("B"-1) Always Below 1 Ω
      W1 ("A"-2) - W1 ("B"-2) Always 10 kΩ or higher
      W1 ("A"-2) - Body ground Always 10 kΩ or higher
      W1 ("A"-1) - W1 ("B"-2) Always Below 1 Ω
      W1 ("A"-1) - W1 ("B"-1) Always 10 kΩ or higher
      W1 ("A"-1) - Body ground Always 10 kΩ or higher
      Fig 2: Checking Harness And Connector (Skid Control Sensor Wire)
      G05830668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE  ).

    NG: REPLACE SKID CONTROL SENSOR WIRE 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Reconnect the skid control sensor wire.
    2. Disconnect the skid control ECU connector and the front speed sensor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      RH 

      STANDARD RESISTANCE REFERENCE CHART

      Tester Connection Condition Specified Condition
      A1+4-3 (FR+) - V1-2 (FR+) Always Below 1 Ω
      A14-3 (FR+) - Body ground Always 10 kΩ or higher
      A14-17 (FR-) - V1-1 (FR-) Always Below 1 Ω
      A14-17 (FR-) - Body ground Always 10 kΩ or higher

      LH 

      STANDARD RESISTANCE REFERENCE CHART

      Tester Connection Condition Specified Condition
      A14-18 (FL+) - W1-2 (FL+) Always Below 1 Ω
      A14-18 (FL+) - Body ground Always 10 kΩ or higher
      A14-4 (FL-) - W1-1 (FL-) Always Below 1 Ω
      A14-4 (FL-) - Body ground Always 10 kΩ or higher
      4. Fig 3: Checking Harness And Connector (Skid Control ECU - Front Speed Sensor)
      G05830669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. INSPECT SKID CONTROL ECU (SENSOR INPUT) 
    1. Reconnect the skid control ECU connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage: 

      RH 

      STANDARD VOLTAGE REFERENCE CHART

      Tester Connection Condition Specified Condition
      V1-2 (FR+) - Body ground Engine switch on (IG) 7.5 to 14 V
      Fig 4: Inspecting Skid Control ECU (Sensor Input)
      G05830670Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      LH 

      STANDARD VOLTAGE REFERENCE CHART

      Tester Connection Condition Specified Condition
      W1-2 (FL+) - Body ground Engine switch on (IG) 7.5 to 14 V

    NG: REPLACE BRAKE ACTUATOR ASSEMBLY 

    OK: Go to next step 

  10. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Reconnect the front speed sensor connector.
    3. Clear the DTC (See FREEZE FRAME DATA  ).
    4. Start the engine.
    5. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.
    6. Check if the same DTC is recorded (See FREEZE FRAME DATA  ).

      Result 

      RESULT REFERENCE CHART

      Condition Proceed to
      DTCs (C0200/31 and/or C0205/32) are output A
      DTCs (C0200/31 and/or C0205/32) are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B: USE SIMULATION METHOD TO CHECK 

    A: Go to next step 

  11. REPLACE FRONT SPEED SENSOR 
    1. Turn the engine switch off.
    2. Replace the front speed sensor (See REMOVAL  for 2WD, or REMOVAL  for 4WD).
      NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE  ).
  12. RECONFIRM DTC 
    1. Clear the DTC (See FREEZE FRAME DATA  ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.
    4. Check if the same DTC is recorded (See FREEZE FRAME DATA  ).

      Result 

      RESULT REFERENCE CHART

      Condition Proceed to
      DTCs (C0200/31 and/or C0205/32) are output A
      DTCs (C0200/31 and/or C0205/32) are not output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B: END 

    A: REPLACE BRAKE ACTUATOR ASSEMBLY 

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Turn the engine switch off.
    2. Repair or replace the harness or connector.
    3. Check for any momentary interruption between the skid control ECU and front speed sensor (See CHECK FOR INTERMITTENT PROBLEMS  ).
    4. Check that there is no momentary interruption.
  14. RECONFIRM DTC 
    1. Clear the DTC (See FREEZE FRAME DATA  ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds.
    4. Check if the same DTC is recorded (See FREEZE FRAME DATA  ).

      Result 

      RESULT REFERENCE CHART

      Condition Proceed to
      DTCs (C0200/31 and/or C0205/32) are not output A
      DTCs (C0200/31 and/or C0205/32) are output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B:  Go to step  2

    A: END 

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