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Home >> Toyota >> 2017 >> Mirai >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (2 Of 2) & Circuit Tests >> 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 [06-2015 - ] >> 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 [06-2015 - ]: 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 [06/2015 - ]

      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 Normal: Normal Error: Momentary interruption
      RL Speed Open Rear speed sensor LH open detection Error or Normal Normal: Normal Error: Momentary interruption

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      RR Speed Open
      RL Speed Open

      OK

      Normal (There are no momentary interruptions.)

      HINT: 

      Perform the above inspection before removing the sensor and connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    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 [06/2015 - ]

      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 OPERATION CHECK [06/2015 - 11/2018] , or refer to OPERATION CHECK [11/2018 - ]

      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: 

    NG 

    See step  5

    Result: 

    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 [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Signal Check

      OK

      All Test Mode DTCs are cleared.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

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

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    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 [06/2015 - ]

      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 [06/2015 - ]

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    B 

    See step  10

  5. CHECK REAR SPEED SENSOR INSTALLATION 
    1. Turn the power switch off.
      GTY495721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a No clearance
      *b OK
      *c NG
    2. Check the speed sensor installation.

      OK

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  6

  6. INSPECT REAR SKID CONTROL SENSOR WIRE 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY574625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear Skid Control Sensor Wire
      *b For RH
      *c For LH
      *d Front view of wire harness connector
      (to Sensor Side Connector)
      *e Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Disconnect the f1 or f2 rear skid control sensor wire connector.
    3. Disconnect the fQ1 or fP1 rear skid control sensor wire connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      f1-2 (RR+) - fQ1-1 (RR+) Always Below 1 Ω
      f1-2 (RR+) or fQ1-1 (RR+) - Body ground and other terminals Always 10 kΩ or higher
      f1-1 (RR-) - fQ1-2 (RR-) Always Below 1 Ω
      f1-1 (RR-) or fQ1-2 (RR-) - Body ground and other terminals Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      f2-2 (RL+) - fP1-1 (RL+) Always Below 1 Ω
      f2-2 (RL+) or fP1-1 (RL+) -Body ground and other terminals Always 10 kΩ or higher
      f2-1 (RL-) - fP1-2 (RL-) Always Below 1 Ω
      f2-1 (RL-) or fP1-2 (RL-) - Body ground and other terminals Always 10 kΩ or higher
      NOTE:

      Check the speed sensor signal after replacement.

      Refer to TEST MODE PROCEDURE [06/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR SKID CONTROL SENSOR WIRE. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR SPEED SENSOR) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    2. Disconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      A63-22 (RR+) - fQ1-1 (RR+) Always Below 1 Ω
      A63-22 (RR+) or fQ1-1 (RR+) - Body ground Always 10 kΩ or higher
      A63-9 (RR-) - fQ1-2 (RR-) Always Below 1 Ω
      A63-9 (RR-) or fQ1-2 (RR-) - Body ground Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      A63-20 (RL+) - fP1-1 (RL+) Always Below 1 Ω
      A63-20 (RL+) or fP1-1 (RL+) - Body ground Always 10 kΩ or higher
      A63-7 (RL-) - fP1-2 (RL-) Always Below 1 Ω
      A63-7 (RL-) or fP1-2 (RL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT) 
    1. Reconnect the A63 skid control ECU (brake booster with master cylinder assembly) connector.
      GTY595430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Speed Sensor)
      *b For RH
      *c For LH
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR RH

      Tester Connection Condition Specified Condition
      fQ1-1 (RR+) - Body ground Power switch on (IG) 5.7 to 14 V
      FOR LH

      Tester Connection Condition Specified Condition
      fP1-1 (RL+) - Body ground Power switch on (IG) 5.7 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  9

  9. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Reconnect the f1 or f2 rear skid control sensor wire connector.
    3. Reconnect the fQ1 or fP1 rear skid control sensor wire connector.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

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

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      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 [06/2015 - ]

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    A 

    See step  10

  10. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY 
    1. Turn the power switch off.
    2. Replace the rear speed sensor rotor with rear speed sensor (rear axle hub and bearing assembly).

      Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]

      HINT: 

      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 with rear speed sensor.

      NOTE:

      Check the speed sensor signal after replacement.

      Refer to TEST MODE PROCEDURE [06/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

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

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      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 [06/2015 - ]

    Result: 

    A 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    B 

    END 

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