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Home >> Lexus >> 2017 >> LS 460 Base, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System - Diagnostic Codes & Symptom Tests >> Electronically Controlled Brake System >> DTC C1466/33: Rear Speed Sensor RH 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); DTC C1467/34: Rear Speed Sensor LH Circuit [09/2015 - ] >> Procedure

DTC C1466/33: Rear Speed Sensor RH 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); DTC C1467/34: Rear Speed Sensor LH Circuit [09/2015 - ]: Procedure

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC (Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Speed Open Rear speed sensor RH open detection / Error or Normal Error: Momentary interruption
      Normal: Normal      		 -
      RL Speed Open Rear 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.

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT) 

    Result:  OK

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Select the Data List mode on the Techstream.
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RL Wheel Speed Rear 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
      RR Wheel Speed Rear 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
    4. Check that the speed value output from the speed sensor displayed on the 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 Techstream is the same as the actual vehicle speed.

      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Direction Rear wheel direction RH / Forward or Back Forward: Forward
      Back: Back      		 -
      RL Wheel Direction Rear 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.

    Result:  NG

    NG 

    See step  5

    Result:  OK

    OK 

    See step  3

  3. PERFORM TEST MODE (SIGNAL CHECK) 
    1. Clear the DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
    2. Perform sensor signal check in "TEST MODE PROCEDURE" (Refer to TEST MODE PROCEDURE [09/2015 - ] ).

      OK

      All Test Mode DTCs are erased.

    Result:  NG

    NG 

    See step  5

    Result:  OK

    OK 

    See step  4

  4. RECONFIRM DTC 
    1. Clear the DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
    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 (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
      RESULT

      Result Proceed to
      DTCs (C1466/33 and C1467/34) are not output A
      DTCs (C1466/33 and C1467/34) 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 (Refer to PROBLEM SYMPTOMS TABLE [09/2015 - ] ).

    Result:  A

    A 

    END 

    Result:  B

    B 

    See step  11

  5. INSPECT REAR SPEED SENSOR INSTALLATION 
    1. Check the sensor installation (Refer to INSTALLATION [09/2015 - 09/2016] Refer to INSTALLATION [09/2016 - ] ).
      GTY677102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

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

      The installation bolt is tightened properly.

      NOTE:

      Check the speed sensor signal after replacement (Refer to TEST MODE PROCEDURE [09/2015 - ] ).

    Result:  NG

    NG 

    SECURELY REINSTALL REAR SPEED SENSOR 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  OK

    OK 

    See step  6

  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 (Refer to TEST MODE PROCEDURE [09/2015 - ] ).

    Result:  NG

    NG 

    CLEAN OR REPLACE REAR SPEED SENSOR 

    Result:  OK

    OK 

    See step  7

  7. CHECK SKID CONTROL SENSOR WIRE 
    1. Disconnect the skid control sensor wire RH connectors.
      GTY632505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the skid control sensor wire LH connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      for RH 

      Tester Connection Condition Specified Condition
      "A"-2 (RR+) - "B"-3 (RR+) Always Below 1 Ω
      "A"-2 (RR+) - "B"-4 (RR-) Always 10 kΩ or higher
      "A"-2 (RR+) - Body ground Always 10 kΩ or higher
      "A"-1 (RR-) - "B"-4 (RR-) Always Below 1 Ω
      "A"-1 (RR-) - "B"-3 (RR+) Always 10 kΩ or higher
      "A"-1 (RR-) - Body ground Always 10 kΩ or higher

      for LH 

      Tester Connection Condition Specified Condition
      "A"-2 (RL+) - "B"-3 (RL+) Always Below 1 Ω
      "A"-2 (RL+) - "B"-4 (RL-) Always 10 kΩ or higher
      "A"-2 (RL+) - Body ground Always 10 kΩ or higher
      "A"-1 (RL-) - "B"-4 (RL-) Always Below 1 Ω
      "A"-1 (RL-) - "B"-3 (RL+) Always 10 kΩ or higher
      "A"-1 (RL-) - Body ground Always 10 kΩ or higher
      NOTE:

      Check the speed sensor signal after replacement (Refer to TEST MODE PROCEDURE [09/2015 - ] ).

    Result:  NG

    NG 

    REPLACE SKID CONTROL SENSOR WIRE 

    Result:  OK

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) 
    1. Disconnect the A19 and A21 ECU connectors.
    2. Disconnect the R56 sensor connector.
    3. Disconnect the S69 sensor connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      for RH 

      Tester Connection Condition Specified Condition
      A21-11 (RR+) - R56-3 (RR+) Always Below 1 Ω
      A21-10 (RR-) - R56-4 (RR-) Always Below 1 Ω
      A21-11 (RR+) - Body ground Always 10 kΩ or higher
      A21-10 (RR-) - Body ground Always 10 kΩ or higher

      for LH 

      Tester Connection Condition Specified Condition
      A19-11 (RL+) - S69-3 (RL+) Always Below 1 Ω
      A19-10 (RL-) - S69-4 (RL-) Always Below 1 Ω
      A19-11 (RL+) - Body ground Always 10 kΩ or higher
      A19-10 (RL-) - Body ground Always 10 kΩ or higher

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  OK

    OK 

    See step  9

  9. CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE) 
    1. Reconnect the A19 and A21 ECU connectors.
      GTY670507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the R56 sensor connector.
    3. Disconnect the S69 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 Switch Condition Specified Condition
      R56-3 (RR+) - Body ground Engine switch on (IG) 6.7 to 14 V
      S69-3 (RL+) - Body ground Engine switch on (IG) 6.7 to 14 V

    Result:  NG

    NG 

    REPLACE SKID CONTROL ECU 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  OK

    OK 

    See step  10

  10. RECONFIRM DTC 
    1. Clear the DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
    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 (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

      HINT: 

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

      RESULT

      Result Proceed to
      DTCs (C1466/33 and C1467/34) are output A
      DTCs (C1466/33 and C1467/34) 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 (Refer to PROBLEM SYMPTOMS TABLE [09/2015 - ] ).

    Result:  B

    B 

    END 

    Result:  A

    A 

    See step  11

  11. REPLACE REAR SPEED SENSOR 
    1. Replace the rear speed sensor (Refer to REMOVAL [09/2015 - ] ).
      NOTE:

      Check the speed sensor signal after replacement (Refer to TEST MODE PROCEDURE [09/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  12

  12. RECONFIRM DTC 
    1. Clear the DTC (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
    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 (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

      HINT: 

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

      RESULT

      Result Proceed to
      DTCs (C1466/33 and C1467/34) are output A
      DTCs (C1466/33 and C1467/34) 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 (Refer to PROBLEM SYMPTOMS TABLE [09/2015 - ] ).

    Result:  B

    B 

    END 

    Result:  A

    A 

    See step  13

  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 (Refer to TEST MODE PROCEDURE [09/2015 - ] ).

    Result:  OK

    OK 

    REPLACE SKID CONTROL ECU 

    (Refer to REMOVAL [09/2015 - ] )

    Result:  NG

    NG 

    CLEAN OR REPLACE SPEED SENSOR ROTOR 

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