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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes & Symptom Tests - (Hybrid) >> Electronically Controlled Brake System >> 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 C1466-33: Rear Speed Sensor RH Circuit; DTC C1467-34: Rear Speed Sensor LH Circuit [02/2014 - ] >> Procedure

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 C1466-33: Rear Speed Sensor RH Circuit; DTC C1467-34: Rear Speed Sensor LH Circuit [02/2014 - ]: Procedure

  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      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      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      RR Speed Open
      RL Speed Open

      OK

      There are no momentary interruptions.

      HINT: 

      Perform the above inspection before removing the sensor and connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  5

    Result:  1

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR) 
    1. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [02/2014 - 11/2016] Refer to DATA LIST / ACTIVE TEST [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear speed sensor RH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      RL Wheel Speed Rear speed sensor LH Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      RR Wheel Speed
      RL Wheel Speed
    2. Check the speed value output from the speed sensor displayed on the Techstream.

      HINT: 

      Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart.

      Refer to ON-VEHICLE INSPECTION [02/2014 - 11/2016] Refer to ON-VEHICLE INSPECTION [11/2016 - ]

      OK

      The speed value output from the speed sensor displayed on the Techstream is similar to the speed indicated on the speedometer.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  5

    Result:  1

    OK 

    See step  3

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK) 
    1. Turn the power switch off.
    2. Perform the sensor check in Test Mode Procedure.

      Refer to TEST MODE PROCEDURE [02/2014 - 11/2016] Refer to TEST MODE PROCEDURE [11/2016 - ]

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Signal Check

      OK

      All Test Mode DTCs are cleared.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  5

    Result:  1

    OK 

    See step  4

  4. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the power switch off.
    4. Turn the power switch on (READY).
    5. Perform a road test.
    6. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1466-33 and C1467-34 are not output. A
      DTCs C1466-33 and/or C1467-34 are output. B

      HINT: 

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

      Refer to PROBLEM SYMPTOMS TABLE [02/2014 - ]

    Result:  1

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - 11/2016]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    B 

    See step  8

  5. CHECK REAR SPEED SENSOR INSTALLATION 
    1. Turn the power switch off.
      GTY424355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor
      *a 8.5 N*m
      *b No clearance
      *c OK
      *d NG
    2. Check the speed sensor installation.

      OK

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

      The installation bolt is tightened properly.

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

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    INSTALL REAR SPEED SENSOR CORRECTLY. Refer to  INSTALLATION [02/2014 - ] 

    Result:  1

    OK 

    See step  6

  6. CHECK REAR SPEED SENSOR AND SENSOR ROTOR 
    1. Remove the rear speed sensor and the component with the speed sensor rotor.

      for Speed Sensor: Refer to REMOVAL [02/2014 - ]

      for Speed Sensor Rotor: Refer to REMOVAL [02/2014 - ]

    2. Check the speed sensor tip and speed sensor rotor.

      OK

      The sensor tip and rotor are free of scratches, oil, and foreign matter.

      NOTE:
      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [02/2014 - 11/2016] Refer to TEST MODE PROCEDURE [11/2016 - ]

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR 

    Result:  1

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR SPEED SENSOR) 
    1. Install the rear speed sensor and the component with the speed sensor rotor.
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    3. Disconnect the A63 or A65 skid control ECU assembly connector.
    4. Disconnect the O3 or O2 rear speed sensor connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      A65-22 (RR+) - O3-2 (RR+) Always Below 1 Ω
      A65-22 (RR+) or O3-2 (RR+) - Body ground Always 10 kΩ or higher
      A65-21 (RR-) - O3-1 (RR-) Always Below 1 Ω
      A65-21 (RR-) or O3-1 (RR-) - Body ground Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      A63-34 (RL+) - O2-3 (RL+) Always Below 1 Ω
      A63-34 (RL+) or O2-3 (RL+) - Body ground Always 10 kΩ or higher
      A63-35 (RL-) - O2-1 (RL-) Always Below 1 Ω
      A63-35 (RL-) or O2-1 (RL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  8

  8. CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS 
    1. Reconnect the A63 or A65 skid control ECU assembly connector.
      GTY441011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Skid Control ECU Assembly)
    2. Reconnect the O3 or O2 rear speed sensor connector.
    3. Connect an oscilloscope to the rear speed sensor terminal of the skid control ECU assembly and body ground.
    4. Check the waveform output when the wheels are rotated.

      OK

      The same waveform is output from all the sensors and there is no noise or interference in the waveform.

      GTY427714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Normal Signal Waveform
      NOTE:

      Check the speed sensor signal after cleaning or replacement.

      Refer to TEST MODE PROCEDURE [02/2014 - 11/2016] Refer to TEST MODE PROCEDURE [11/2016 - ]

      HINT: 

      • As the vehicle speed (wheel revolution speed) increases, the waveform cycle narrows.
      • When noise is identified in the waveform on the oscilloscope, the erratic signals are likely due to speed sensor rotor scratches, looseness or attached foreign matter.
      • The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

        If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing assembly.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR 

    Result:  1

    OK 

    See step  9

  9. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the power switch off.
    3. Turn the power switch on (READY).
    4. Perform a road test.
    5. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2014 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1466-33 and/or C1467-34 are output. A
      DTCs C1466-33 and C1467-34 are not output. B

      HINT: 

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

      Refer to PROBLEM SYMPTOMS TABLE [02/2014 - ]

    Result:  1

    A 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

    Result:  2

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - 11/2016]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

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