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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> 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) >> Wiring Diagram
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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): Wiring Diagram

Fig 1: Wiring Diagram Brake Actuator Assembly
G04047591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).
  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 HOW TO PROCEED WITH TROUBLESHOOTING  ).

    ABS / VSC: 

    ITEM REFERENCE 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

    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 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 REFERENCE CHART

      Item (Display) Measurement Item/Range (Display) Normal Condition
      FR WHEEL SPD FR wheel speed sensor reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed
      FL WHEEL SPD 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 the intelligent tester and the speed value displayed on the speedometer 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 REFERENCE CHART

      Item (Display) Measurement Item/Range (Display) Normal Condition
      FR WHEEL DIR FR wheel direction / FORWARD or BACK FORWARD: Forward
      BACK: Back
      FL WHEEL DIR 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  .

      All Test Mode DTCs are erased. 

    NG: GO TO STEP  5

    OK: Go To Next Step 

  4. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    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 DTC CHECK / CLEAR  ).

    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 2: Checking Front Speed Sensor Installation
    G04047592Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result 

    RESULT REFERENCE CHART

    Result Proceed to
    OK (for 4WD) 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 (FOR 4WD)  .
    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: 

    TESTER CONNECTION SPECIFIED CONDITION

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

    LH: 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    W1 ("A"-2) - W1 ("B"-1)  Always  Below 1Ω 
    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 1Ω 
    W1 ("A"-1) - W1 ("B"-1)  Always  10 kΩ or higher 
    W1 ("A"-1) - Body ground  Always  10 kΩ or higher 
    Fig 3: Identifying Connector Terminals Skid Control Sensor
    G04047593Courtesy 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 

    TESTER CONNECTION SPECIFIED CONDITION

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

    LH 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    A14-18 (FL+) -W1-2 (FL+)  Always  Below 1Ω 
    A14-18 (FL+) - Body ground  Always  10 kΩ or higher 
    A14-4 (FL-) - W1-1 (FL-)  Always  Below 1Ω 
    A14-4 (FL-) - Body ground  Always  10 kΩ or higher 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
      Fig 4: Identifying Connector Terminals Skid Control ECU - Front Speed Sensor
      G04047594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. 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 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    V1-2 (FR+) - Body ground  Engine switch on (IG)  7.5 to 14 V 

    LH 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    W1-2 (FL+) - Body ground  Engine switch on (IG)  7.5 to 14 V 
    Fig 5: Identifying Connector Terminals Inspect Skid Control ECU
    G04047595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 DTC CHECK / CLEAR  ).
    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 DTC CHECK / CLEAR  ).

    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 FRONT SPEED SENSOR (FOR 4WD)  for 4WD).
      NOTE: Check the speed sensor signal after replacement (See TEST MODE PROCEDURE  ).

    NEXT: Go To Next Step 

  12. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    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 DTC CHECK / CLEAR  ).

    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 HOW TO PROCEED WITH TROUBLESHOOTING  ).
    4. Check that there is no momentary interruption.

    NEXT: Go To Next Step 

  14. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    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 DTC CHECK / CLEAR  ).

    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 

    B: Go to step 2 

    A: END 

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