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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Brakes >> Traction Control >> 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

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 or Techstream and start from "PERFORM TEST MODE" when not using the intelligent tester or Techstream.

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

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        FR SPD OPN Front speed sensor RH open detection / ERROR or NORMAL ERROR: Momentary interruption
        NORMAL: Normal        		 -
        FL SPD OPN Front speed sensor LH open detection / ERROR or NORMAL ERROR: Momentary interruption
        NORMAL: Normal        		 -
      2. Techstream

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        FR Speed Open Front speed sensor RH open detection / ERROR or NORMAL ERROR: Momentary interruption
        NORMAL: Normal        		 -
        FL Speed Open Front speed sensor LH 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 OR TECHSTREAM (FRONT SPEED SENSOR) 
    1. Connect the intelligent tester or Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Select the DATA LIST mode on the intelligent tester or Techstream.
      1. Intelligent tester

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        FR WHEEL SPD Front wheel speed sensor RH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
        FL WHEEL SPD Front wheel speed sensor LH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
      2. Techstream Skid control ECU:
        SKID CONTROL ECU

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        FR Wheel Speed Front wheel speed sensor RH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
        FL Wheel Speed Front wheel speed sensor LH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
    4. Check that the speed value output from the speed sensor displayed on the intelligent tester or Techstream 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 or Techstream is the same as the actual vehicle speed. 

      1. Intelligent tester

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        FR WHEEL DIR Front wheel direction RH / FORWARD or BACK FORWARD: Forward
        BACK: Back        		 -
        FL WHEEL DIR Front wheel direction LH / FORWARD or BACK FORWARD: Forward
        BACK: Back        		 -
      2. Techstream

        Skid control ECU: 

        SKID CONTROL ECU

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        FR Wheel Direction Front wheel direction RH / FORWARD or BACK FORWARD: Forward
        BACK: Back        		 -
        FL Wheel Direction Front wheel direction LH / 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" (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 DTC CHECK/CLEAR  ).
    2. Turn the engine switch on (IG).
    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 REFERENCE

      Result 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   10 

    A: GO TO NEXT STEP 

    END 

  5. INSPECT FRONT SPEED SENSOR INSTALLATION 
      Fig 1: Inspecting Front Speed Sensor
      G04949603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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: SECURELY REINSTALL FRONT SPEED SENSOR (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  6. CHECK FRONT SPEED SENSOR WIRE 
      Fig 2: Checking Front Speed Sensor Wire
      G04949604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the front speed sensor wire RH.
    2. Disconnect the front speed sensor wire LH.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance: 

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION

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

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      "A"-1 (FL+) - "B"-1 Always Below 1 Ω
      "A"-1 (FL+) - "B"-2 Always 10 kΩ or higher
      "A"-1 (FL+) - Body ground Always 10 kΩ or higher
      "A"-2 (FL-) - "B"-2 Always Below 1 Ω
      "A"-2 (FL-) - "B"-1 Always 10 kΩ or higher
      "A"-2 (FL-) - Body ground Always 10 kΩ or higher
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).

    NG: REPLACE FRONT SPEED SENSOR WIRE 

    OK: GO TO NEXT STEP 

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
      Fig 3: Identifying A19 And A21 ECU Connectors And A55 Sensor Connector
      G04949605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A19 and A21 ECU connectors.
    2. Disconnect the A55 sensor connector.
    3. Disconnect the A5 sensor connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard resistance: 

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      A19-16 (FR+) - A55-2 (FR+) Always Below 1 Ω
      A19-15 (FR-)-A55-1 (FR-) Always Below 1 Ω
      A19-16 (FR+)-Body ground Always 10 kΩ or higher
      A19-15 (FR-) - Body ground Always 10 kΩ or higher

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      A21-16 (FL+)-A5-2 (FL+) Always Below 1 Ω
      A21-15 (FL-)-A5-1 (FL-) Always Below 1 Ω
      A21-16 (FL+)-Body ground Always 10 kΩ or higher
      A21-15 (FL-)-Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  8. CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE) 
      Fig 4: Identifying A55 Sensor Connector And A5 Sensor Connector
      G04949606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the A19 and A21 ECU connectors.
    2. Disconnect the A55 sensor connector.
    3. Disconnect the A5 sensor connector.
    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      A55-2 (FR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      A5-2 (FL+) - Body ground Engine switch on (IG) 6.7 to 14 V

    NG: REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  9. 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 REFERENCE

      Result 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 

  10. REPLACE FRONT SPEED SENSOR 
    1. Replace the front speed sensor (see REMOVAL  ).
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE  ).

      HINT:

      The front speed sensor is a component of the front axle hub sub-assembly. If the sensor is replaced, replace the hub and bearing assembly.

  11. 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 REFERENCE

      Result 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 

    REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

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