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Home >> Lexus >> 2007 >> GS 350 AWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Brake Control >> Electronically Controlled Brake System >> DTC C0210/33 Rear Speed Sensor RH Circuit; DTC C0215/34 Rear Speed Sensor LH Circuit; DTC C1273/73 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274/74 Low Output Signal of Rear 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
    RR SPD OPN RR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal
    RL SPD OPN RL 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 (REAR 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
      RL WHEEL SPD Wheel speed sensor (RL) reading /
      min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)      		 Actual wheel speed
      RR WHEEL SPD Wheel speed sensor (RR) 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
      RR WHEEL DIR Wheel direction (RR) / FORWARD or BACK FORWARD: Forward
      BACK: Back
      RL WHEEL DIR Wheel direction (RL) / 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. 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 

    REFERENCE CHART

    Display (DTC Output) Proceed To
    DTCs (C0210/33 and C0215/34) are not output A
    DTCs (C0210/33 and C0215/34) 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 REAR SPEED SENSOR INSTALLATION 
    1. Check the sensor installation.

      OK: 

      There is no clearance between the sensor and the rear axle carrier. 

      The installation bolt is tightened properly. 

      Torque: 8.5 N*m (87 kgf*, 75 in.*lbf) 

      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).
    Fig 1: Inspecting Rear Speed Sensor Installation
    G05296916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK AND REPLACE REAR SPEED SENSOR 

    OK: Go to next step 

  6. INSPECT REAR SPEED SENSOR TIP 
    1. Remove the rear 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 REAR 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
      n1 ("A"-2) - n1 ("B"-4) Below 1 Ω
      n1 ("A"-2) - n1 ("B"-5) 10 kΩ or higher
      n1 ("A"-2) - Body ground 10 kΩ or higher
      n1 ("A"-1) - n1 ("B"-5) Below 1 Ω
      n1 ("A"-1) - n1 ("B"-4) 10 kΩ or higher
      n1 ("A"-1) - Body ground 10 kΩ or higher

      LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      o1 ("A"-2) - o1 ("B"-4) Below 1 Ω
      o1 ("A"-2) - o1 ("B"-5) 10 kΩ or higher
      o1 ("A"-2) - Body ground 10 kΩ or higher
      o1 ("A"-1) - o1 ("B"-5) Below 1 Ω
      o1 ("A"-1) - o1 ("B"-4) 10 kΩ or higher
      o1 ("A"-1) - Body ground 10 kΩ or higher
      NOTE: Check the speed sensor signal after replacement (see TEST MODE PROCEDURE ).
    Fig 2: Identifying Skid Control Sensor Wire Connector Terminals
    G05297050Courtesy 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 REAR SPEED SENSOR) 
    1. Disconnect the skid control ECU (A13, A15) connectors and the rear 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
      A15-10 (RR+) - n1-2 (RR+) Below 1 Ω
      A15-23 (RR-) - n1-1 (RR-) Below 1 Ω

      LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      A13-11 (RL+) - o1-2 (RL+) Below 1 Ω
      A13-12 (RL-) - o1-1 (RL-) 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
      A15-10 (RR+) - Body ground 10 kΩ or higher
      A15-23 (RR-) - Body ground 10 kΩ or higher

      LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      A13-11 (RL+) - Body ground 10 kΩ or higher
      A13-12 (RL-) - Body ground 10 kΩ or higher
    Fig 3: Identifying Skid Control ECU (A15, A13) And Rear Speed Sensor Connector Terminals
    G05297051Courtesy 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
      n1-2 (RR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      o1-2 (RL+) - Body ground Engine switch on (IG) 6.7 to 14 V
    Fig 4: Identifying Rear Speed Sensor Connector Terminals
    G05297052Courtesy 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 (C0210/33 and C0215/34) are not output A
    DTCs (C0210/33 and C0215/34) 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 REAR SPEED SENSOR 
    1. Replace the rear speed sensor (see REAR SPEED SENSOR ).
      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 (C0210/33 and C0215/34) are output A
    DTCs (C0210/33 and C0215/34) 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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