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Home >> Lexus >> 2007 >> GS 350 RWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> 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) >> Inspection Procedure
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Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see INITIALIZATION ).

HINT:

Start the inspection from "CHECK HARNESS AND CONNECTOR" when using the intelligent tester and start from "PERFORM TEST MODE" 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: 

    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: 

      NORMAL CONDITION CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      FR WHEEL SPD Wheel speed sensor (FR) reading /
      min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)      		 Actual wheel speed
      FL WHEEL SPD Wheel speed sensor (FL) reading /
      min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)      		 Actual wheel speed
    4. Check that 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: 

      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 DTC CHECK / CLEAR ).
    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 DTC CHECK / CLEAR ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.
    4. Check if the same DTCs are recorded (see DTC CHECK / CLEAR ).

    Result 

    RESULT 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 

  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 ).
    Fig 1: Checking Front Speed Sensor Installation
    G05297044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK AND REPLACE FRONT SPEED SENSOR 

    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 SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      t1 ("A"-2) - t1 ("B"-1) Below 1 Ω
      t1 ("A"-2) - t1 ("B"-2) 10 kΩ or higher
      t1 ("A"-2) - Body ground 10 kΩ or higher
      t1 ("A"-1) - t1 ("B"-2) Below 1 Ω
      t1 ("A"-1) - t1 ("B"-1) 10 kΩ or higher
      t1 ("A"-1) - Body ground 10 kΩ or higher

      LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      m1 ("A"-2) - m1 ("B"-1) Below 1 Ω
      ml ("A"-2) - ml ("B"-2) 10 kΩ or higher
      ml ("A"-2) - Body ground 10 kΩ or higher
      ml ("A"-1) - m1 ("B"-2) Below 1 Ω
      ml ("A"-1) - m1 ("B"-1) 10 kΩ or higher
      ml ("A"-1) - Body ground 10 kΩ or higher
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).
    Fig 2: Checking Harness And Connector (Skid Control Sensor Wire)
    G05297045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 (A13, A15) connectors and the front speed sensor connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      A13-15 (FR+) - t1-2 (FR+) Below 1 Ω
      A13-28 (FR-) - t1-1 (FR-) Below 1 Ω

      LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      A15-13 (FL+) - m1-2 (FL+) Below 1 Ω
      A15-25 (FL-) - m1-1 (FL-) Below 1 Ω
    3. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      A13-15 (FR+) - Body ground 10 kΩ or higher
      A13-28 (FR-) - Body ground 10 kΩ or higher

      LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      A15-13 (FL+) - Body ground 10 kΩ or higher
      A15-25 (FL-) - Body ground 10 kΩ or higher
    Fig 3: Identifying Skid Control ECU (A13, A15) And Front Speed Sensor Connector Terminals
    G05297046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. INSPECT SKID CONTROL ECU (SENSOR INPUT VOLTAGE) 
    1. Reconnect the skid control ECU (A13, A15) 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 SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      t1-2 (FR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      m1-2 (FL+) - Body ground Engine switch on (IG) 6.7 to 14 V
    Fig 4: Identifying Front Speed Sensor Connector Terminals
    G05297047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SKID CONTROL ECU 

    OK: Go to next step 

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

      HINT:

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

    Result 

    RESULT 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 REMOVAL ).
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).
  12. RECONFIRM DTC 
    1. Clear the DTC (see DTC CHECK / CLEAR ).
    2. Start the engine.
    3. Drive the vehicle at the speed of 32 km/h (20 mph) or more for 60 seconds or more.
    4. Check if the same DTCs are recorded (see DTC CHECK / CLEAR ).

      HINT:

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

    Result 

    RESULT 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, refer back to the table and proceed to the next step (see 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 

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