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Home >> Lexus >> 2010 >> ES 350 >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Stability Control System (Diagnostic Codes & Symptom Tests) >> Vehicle Stability Control System >> 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) >> Procedure
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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): Procedure

  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. Refer to CHECK FOR INTERMITTENT PROBLEMS .
      ABS / VSC / TRAC:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      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

      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.

    C → See step   5 

    B → See step   11 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) 
    1. Turn the engine switch off.
    2. Connect Techstream to the DLC3.
    3. Start the engine.
    4. Select the Data List on Techstream.
      ABS / VSC / TRAC:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed FR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed -
      FL Wheel Speed FL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed -
    5. 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.

    NG → See step   5 

    OK: Go to next step 

  3. PERFORM TEST MODE (SIGNAL CHECK) 
    1. Perform sensor check in the Test Mode procedure. Refer to TEST MODE PROCEDURE .

      OK

      All Test Mode DTCs are cleared.

    NG → See step   5 

    OK: Go to next step 

  4. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Clear the DTC. Refer to DTC CHECK / CLEAR .
    3. Start the engine.
    4. Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.
    5. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

      Result

      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. Refer to PROBLEM SYMPTOMS TABLE .

    B → See step   7 

    A → CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) 

  5. CHECK FRONT SPEED SENSOR INSTALLATION 
    1. Turn the engine switch off.
      Fig 1: Identifying Clearance Between Sensor And Front Steering Knuckle
      GTY111284Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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: 8.0 N*m (82 kgf*cm, 71 in.*lbf) 

    NG → INSTALL FRONT SPEED SENSOR CORRECTLY 

    OK: Go to next step 

  6. CHECK FRONT SPEED SENSOR TIP 
    1. Remove the front speed sensor. Refer to REMOVAL .
    2. Check the speed sensor tip.

      OK

      No scratches or foreign matter on the sensor tip.

      NOTE:

      Check the speed sensor signal after cleaning or replacement. Refer to TEST MODE PROCEDURE .

    NG → CLEAN OR REPLACE FRONT SPEED SENSOR 

    OK: Go to next step 

  7. INSPECT FRONT SPEED SENSOR 
    1. Turn the engine switch off.
      Fig 2: Front Speed Sensor
      GTY269101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the front speed sensor.
    3. Disconnect the front speed sensor connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      RH 

      LH 

      Tester Connection Condition Specified Condition
      1 (FR+) - 2 (FR-) Always 1.4 to 1.8 kΩ at 20°C (68°F)
      1 (FR+) - Body ground Always 10 kΩ or higher
      2 (FR-) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      1 (FL+) - 2 (FL-) Always 1.4 to 1.8 kΩ at 20°C (68°F)
      1 (FL+) - Body ground Always 10 kΩ or higher
      2 (FL-) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Speed Sensor
      NOTE:

      Check the speed sensor signal after replacement. Refer to TEST MODE PROCEDURE .

    NG → REPLACE FRONT SPEED SENSOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Disconnect the skid control ECU connector.
      Fig 3: A36, A39 & A38 Connectors
      GTY277824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      RH 

      LH 

      Tester Connection Condition Specified Condition
      A36-3 (FR+) - A39-1 (FR+) Always Below 1 Ω
      A36-3 (FR+) - Body ground Always 10 kΩ or higher
      A36-17 (FR-) - A39-2 (FR-) Always Below 1 Ω
      A36-17 (FR-) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      A36-18 (FL+) - A38-1 (FL+) Always Below 1 Ω
      A36-18 (FL+) - Body ground Always 10 kΩ or higher
      A36-4 (FL-) - A38-2 (FL-) Always Below 1 Ω
      A36-4 (FL-) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Skid Control ECU Harness Side Connector Front View
      *2 Front Speed Sensor Harness Side Connector Front View

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK SPEED SENSOR AND SPEED SENSOR ROTOR SERRATIONS 
    1. Reconnect the front speed sensor connector.
      Fig 4: A36 Connector
      GTY260189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the oscilloscope to the front speed sensor terminal of the skid control ECU.
    3. Check that a waveform is output when the tires are rotated (by the sensor circuit).

      OK

      The same waveform is output from all the 4 wheels and there is no noise or interference in the waveform.

      HINT: 

      • As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the output voltage becomes greater.
      • When noise is identified in the waveform on the oscilloscope, the erratic signals are generated due to speed sensor rotor's scratches, looseness or foreign matter attached to it.
      TEXT IN ILLUSTRATION

      *1 Skid Control ECU Harness Side Connector Front View
      *2 Normal Signal Waveform
      *3 1 V/Division, 2 ms/Division
      NOTE:

      Check the speed sensor signal after cleaning or replacement. Refer to TEST MODE PROCEDURE .

    NG → CLEAN OR REPLACE SPEED SENSOR OR SPEED SENSOR ROTOR 

    OK: Go to next step 

  10. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Reconnect the skid control ECU connector.
    3. Clear the DTC. Refer to DTC CHECK / CLEAR .
    4. Start the engine.
    5. Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.
    6. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

      Result

      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. Refer to PROBLEM SYMPTOMS TABLE .

    B → REPLACE BRAKE ACTUATOR ASSEMBLY 

    A → CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) 

  11. 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. Refer to CHECK FOR INTERMITTENT PROBLEMS .
    4. Check that there is no momentary interruption.

    NEXT: Go to next step 

  12. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Clear the DTC. Refer to DTC CHECK / CLEAR .
    3. Start the engine.
    4. Drive the vehicle at the speed of 32 km/h (20 mph) or more for at least 60 seconds.
    5. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

      Result

      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. Refer to PROBLEM SYMPTOMS TABLE .

    B → See step   2 

    A → END 

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