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Home >> Toyota >> 2017 >> Prius C Two >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System - Diagnostic Codes & Symptom Tests >> Electronically Controlled Brake System >> 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); DTC C1464/31: Front Speed Sensor RH Circuit; DTC C1465/32: Front Speed Sensor LH Circuit [11/2015 - ] >> Procedure
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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); DTC C1464/31: Front Speed Sensor RH Circuit; DTC C1465/32: Front Speed Sensor LH Circuit [11/2015 - ]: 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 [11/2015 - ] ).
      ABS/VSC/TRAC

      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.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) 
    1. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [11/2015 - ] ).
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed Front 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
      FL Wheel Speed Front 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
    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 [11/2015 - 06/2017]

      OK

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

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK) 
    1. Turn the ignition switch off.
    2. Perform the sensor check in the Test Mode procedure (Refer to TEST MODE PROCEDURE [11/2015 - ] ).

      OK

      All Test Mode DTCs are cleared.

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. RECONFIRM DTC 
    1. Turn the ignition switch off.
    2. Clear the DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    3. Turn the ignition switch to ON (READY).
    4. Perform a road test.
    5. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      Result

      Result Proceed to
      DTCs C1464/31 and C1465/32 are not output. A
      DTCs C1464/31 and/or C1465/32 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 [11/2015 - ] ).

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

    Result: 

    B 

    See step  10

  5. CHECK FRONT SPEED SENSOR INSTALLATION 
    1. Turn the ignition switch off.
      GTY712208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the speed sensor installation.

      OK

      There is no clearance between the sensor and the front steering knuckle.

      The installation bolt is tightened properly.

      Torque 

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

    Result: 

    NG 

    INSTALL FRONT SPEED SENSOR CORRECTLY 

    Refer to INSTALLATION [11/2015 - ] )

    Result: 

    OK 

    See step  6

  6. CHECK FRONT SPEED SENSOR TIP 
    1. Remove the front speed sensor (Refer to REMOVAL [11/2015 - ] ).
    2. Check the speed sensor tip.

      OK

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

      NOTE:

      Check the speed sensor signal after cleaning or replacement (Refer to TEST MODE PROCEDURE [11/2015 - ] ).

    Result: 

    NG 

    CLEAN OR REPLACE FRONT SPEED SENSOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) 
    1. Install the front speed sensor.
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    3. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector and the front speed sensor connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for RH 

      Tester Connection Condition Specified Condition
      A41-18 (FR+) - A21-2 (FR+) Always Below 1 Ω
      A41-18 (FR+) - Body ground Always 10 kΩ or higher
      A41-5 (FR-) - A21-1 (FR-) Always Below 1 Ω
      A41-5 (FR-) - Body ground Always 10 kΩ or higher

      for LH 

      Tester Connection Condition Specified Condition
      A41-31 (FL+) - A22-2 (FL+) Always Below 1 Ω
      A41-31 (FL+) - Body ground Always 10 kΩ or higher
      A41-32 (FL-) - A22-1 (FL-) Always Below 1 Ω
      A41-32 (FL-) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT SKID CONTROL ECU (SENSOR OUTPUT) 
    1. Reconnect the skid control ECU (brake booster with master cylinder assembly) connector.
      GTY696016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      for RH 

      Tester Connection Condition Specified Condition
      A21-2 (FR+) - Body ground Ignition switch ON (IG) 5.7 to 14 V

      for LH 

      Tester Connection Condition Specified Condition
      A22-2 (FL+) - Body ground Ignition switch ON (IG) 5.7 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Speed Sensor)

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    OK 

    See step  9

  9. RECONFIRM DTC 
    1. Turn the ignition switch off.
    2. Reconnect the front speed sensor connector.
    3. Clear the DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    4. Turn the ignition switch to ON (READY).
    5. Perform a road test.
    6. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      Result

      Result Proceed to
      DTCs C1464/31 and/or C1465/32 are output. A
      DTCs C1464/31 and C1465/32 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 [11/2015 - ] ).

    Result: 

    B 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

    Result: 

    A 

    See step  10

  10. REPLACE FRONT SPEED SENSOR 
    1. Turn the ignition switch off.
    2. Replace the front speed sensor (Refer to REMOVAL [11/2015 - ] ).
      NOTE:

      Check the speed sensor signal after replacement (Refer to TEST MODE PROCEDURE [11/2015 - ] ).

    NEXT 

    See step  11

  11. RECONFIRM DTC 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    2. Turn the ignition switch to ON (READY).
    3. Perform a road test.
    4. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      Result

      Result Proceed to
      DTCs C1464/31 and/or C1465/32 are output. A
      DTCs C1464/31 and C1465/32 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 [11/2015 - ] ).

    Result: 

    B 

    END 

    Result: 

    A 

    See step  12

  12. REPLACE FRONT AXLE HUB BEARING 
    1. Turn the ignition switch off.
    2. Replace the front speed sensor rotor (front axle hub bearing) (Refer to REMOVAL [11/2015 - ] ).

      HINT: 

      The front speed sensor rotor is incorporated into the front axle hub bearing.

      If the front speed sensor rotor needs to be replaced, replace the front axle hub bearing.

      NOTE:

      Check the speed sensor signal after replacement (Refer to TEST MODE PROCEDURE [11/2015 - ] ).

    NEXT 

    See step  13

  13. RECONFIRM DTC 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    2. Turn the ignition switch to ON (READY).
    3. Perform a road test.
    4. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      Result

      Result Proceed to
      DTCs C1464/31 and/or C1465/32 are output. A
      DTCs C1464/31 and C1465/32 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 [11/2015 - ] ).

    Result: 

    A 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    Result: 

    B 

    END 

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