LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2006 >> GS 430 >> Repair and Diagnosis (Single Page) >> Brakes >> Brakes Control Systems >> Brake Control >> Electronically Controlled Brake 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) >> Wiring Diagram
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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): Wiring Diagram

Fig 1: Identifying Speed Sensor Wiring Diagram
G04025114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (See CHECK FOR INTERMITTENT PROBLEMS  ).

HINT:

Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the intelligent tester.

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See CHECK FOR INTERMITTENT PROBLEMS  ).

      ABS / VSC: 

      ITEM (DISPLAY) MEASUREMENT ITEM / RANGE (DISPLAY) AND NORMAL CONDITION CHART

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

      OK: 

      There are no momentary interruptions. 

      HINT:

      Perform the above inspection before removing the sensor and connector.

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT) 

    OK : Go to Next Step 

  2. READ VALUE OF INTELLIGENT TESTER (FRONT SPEED SENSOR) 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine.
    3. Select the DATA LIST mode on the intelligent tester.

      ABS / VSC: 

      ITEM (DISPLAY) MEASUREMENT ITEM / RANGE (DISPLAY) AND NORMAL CONDITION CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      FR WHEEL SPD Wheel speed sensor (FR) reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed
      FL WHEEL SPD Wheel speed sensor (FL) reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed
    4. Check that there is the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer are almost the same when driving the vehicle.

      OK: 

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

      ABS / VSC: 

      ITEM (DISPLAY) MEASUREMENT ITEM / RANGE (DISPLAY) AND NORMAL CONDITION CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      FR WHEEL DIR Wheel direction (FR) / FORWARD or BACK FORWARD: Forward
      BACK: Back
      FL WHEEL DIR Wheel direction (FL) / 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. Clear the DTC (See DIAGNOSIS SYSTEM  ).
    2. Perform sensor signal check in 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 DIAGNOSIS SYSTEM  ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 20 mph (32 km/h) or more for 60 seconds or more.
    4. Check if the same DTCs are recorded (See DIAGNOSIS SYSTEM  ).

      Result 

      DISPLAY (DTC OUTPUT) PROCEED TO REFERENCE CHART

      Display (DTC Output) Proceed To
      DTCs (C0200/31 and C0205/32) are not output A
      DTCs (C0200/31 and C0205/32) are output B

      HINT:

      If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE  .

    B : Go to step   11 

    A : END 

  5. INSPECT FRONT SPEED SENSOR INSTALLATION 
    1. Check the sensor installation.

      OK: 

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

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

    NG : CHECK AND REPLACE FRONT SPEED SENSOR 

    Fig 2: Identifying Sensor Installation
    G04025115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  6. INSPECT FRONT SPEED SENSOR TIP 
    1. Remove the front speed sensor.
    2. Check the sensor tip.

      OK: 

      No scratches or foreign matter on the sensor tip. 

      NOTE: Check the speed sensor signal after 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. Disconnect the skid control sensor wire.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      RH 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      h1 ("A"-2) - h1 ("B"-1) Below 1 Ω
      h1 ("A"-2) - h1 ("B"-2) 10 kΩ or higher
      h1 ("A"-2) - Body ground 10 kΩ or higher
      h1 ("A"-1) - h1 ("B"-2) Below 1 Ω
      h1 ("A"-1) - h1 ("B"-1) 10 kΩ or higher
      h1 ("A"-1) - Body ground 10 kΩ or higher

      LH 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      i1 ("A"-2) - i1 ("B"-1) Below 1 Ω
      i1 ("A"-2) - i1 ("B"-2) 10 k Ω or higher
      i1 ("A"-2) - Body ground 10 kΩ or higher
      i1 ("A"-1) - i1 ("B"-2) Below 1 Ω
      i1 ("A"-1) - i1 ("B"-1) 10 kΩ or higher
      i1 ("A"-1) - Body ground 10 kΩ or higher
      Fig 3: Identifying Harness And Connector (Skid Control Sensor Wire)
      G04025116Courtesy 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 TO FRONT SPEED SENSOR) 
    1. Disconnect the skid control ECU (A52, A54) connectors and the front speed sensor connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      RH 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A52-15 (FR+) - h1-2 (FR+) Below 1 Ω
      A52-28 (FR-) - h1-1 (FR-) Below 1 Ω

      LH 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A54-13 (FL+) - i1-2 (FL+) Below 1 Ω
      A54-25 (FL-) - i1-1 (FL-) Below 1 Ω
    3. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      RH 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A52-15 (FR+) - Body ground 10 kΩ or higher
      A52-28 (FR-) - Body ground 10 kΩ or higher

      LH 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A54-13 (FL+) - Body ground 10 kΩ or higher
      A54-25 (FL-) - Body ground 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Identifying Skid Control ECU (A52, A54) Connectors And Front Speed Sensor Connector
    G04025117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  9. INSPECT SKID CONTROL ECU (SENSOR INPUT VOLTAGE) 
    1. Reconnect the skid control ECU (A52, A54) connectors.
    2. Disconnect the speed sensor connector.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      h1-2 (FR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      i1-2 (FL+) - Body ground Engine switch on (IG) 6.7 to 14 V
      Fig 5: Identifying Speed Sensor Connector
      G04025118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE SKID CONTROL ECU 

    OK : GO TO NEXT STEP 

  10. RECONFIRM DTC 
    1. Clear the DTC (See DIAGNOSIS SYSTEM  ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 20 mph (32 km/h) or more for 60 seconds or more.
    4. Check if the same DTCs are recorded (See DIAGNOSIS SYSTEM  ).

      HINT: 

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result 

      DISPLAY (DTC OUTPUT) AND PROCEED TO REFERENCE CHART

      Display (DTC Output) Proceed To
      DTCs (C0200/31 and C0205/32) are not output A
      DTCs (C0200/31 and 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 : END 

  11. REPLACE FRONT SPEED SENSOR 
    1. Replace the front speed sensor (See DISPOSAL  ).
      NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE  ).

      NEXT 

  12. RECONFIRM DTC 
    1. Clear the DTC (See DIAGNOSIS SYSTEM  ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 20 mph (32 km/h) or more for 60 seconds or more.
    4. Check if the same DTCs are recorded (See DIAGNOSIS SYSTEM  ).

      HINT:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result 

      DISPLAY (DTC OUTPUT) AND PROCEED TO REFERENCE CHART

      Display (DTC Output) Proceed To
      DTCs (C0200/31 and C0205/32) are output A
      DTCs (C0200/31 and C0205/32) are not output B

      HINT:

      If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE  .

    B : END 

    A : GO TO NEXT STEP 

  13. INSPECT SPEED SENSOR ROTOR 
    1. Remove the speed sensor rotor.
    2. Check the sensor rotor.

      OK: 

      No scratches, oil, or foreign matter on the rotors. 

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

    NG : CLEAN OR REPLACE SPEED SENSOR ROTOR 

    OK : REPLACE SKID CONTROL ECU 

scientia non olet · About LEMON Manuals