LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2021 >> RAV4 LE, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Vacuum Brake Booster) - Diagnostic Codes (5 Of 8) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster) >> DTC C1273: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466: Rear Speed Sensor RH Circuit; DTC C1467: Rear Speed Sensor LH Circuit [10/2019 - 08/2020] >> Procedure

DTC C1273: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466: Rear Speed Sensor RH Circuit; DTC C1467: Rear Speed Sensor LH Circuit [10/2019 - 08/2020]: 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 [02/2019 - 12/2021]

      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: Momentary interruption not detected
      Normal: Momentary interruption not detected      		 After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".
      RL Speed Open Rear speed sensor LH open detection Error or Normal Error: Momentary interruption detected
      Normal: Momentary interruption not detected      		 After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

      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 [02/2019 - 12/2021]

      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 [11/2018 - 12/2021]

      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 (for 2WD)
      NG (for AWD)

    Result: 

    NG (for 2WD) 

    See step  5

    Result: 

    NG (for AWD) 

    See step  9

    Result: 

    OK 

    See step  3

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

      Refer to TEST MODE PROCEDURE [02/2019 - 08/2020]

      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 ignition switch off.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the ignition switch ON (READY).
    4. Perform a road test.
    5. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [02/2019 - 12/2021]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1466 and C1467 are not output. A
      DTCs C1466 and/or C1467 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 [11/2018 - 12/2021]

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    B 

    See step  6

  5. CHECK REAR SPEED SENSOR INSTALLATION 
    1. Turn the ignition 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 [10/2019 - 08/2020] 

    Result: 

    OK 

    See step  6

  6. INSPECT PARKING BRAKE WIRE ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY906989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for RH
      *B for LH
      *1 Skid Control Sensor Wire (Parking Brake Wire Assembly)
      *a Front view of wire harness connector
      (to Sensor Side Connector)
      *b Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Disconnect the M50 or N58 skid control sensor wire (parking brake wire assembly) connector.
    3. Disconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - MM3-3 Always Below 1 Ω
      M50-2 (RA+) or MM3-3 - Body ground and other terminals Always 10 kΩ or higher
      M50-1 (RA-) - MM3-4 Always Below 1 Ω
      M50-1 (RA-) or MM3-4 - Body ground and other terminals Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - NN6-3 Always Below 1 Ω
      N58-2 (LA+) or NN6-3 - Body ground and other terminals Always 10 kΩ or higher
      N58-1 (LA-) - NN6-4 Always Below 1 Ω
      N58-1 (LA-) or NN6-4 - Body ground and other terminals Always 10 kΩ or higher
      NOTE:

      Check the speed sensor signal after replacement.

      Refer to TEST MODE PROCEDURE [02/2019 - 08/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PARKING BRAKE WIRE ASSEMBLY 

    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. Reconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.
    3. Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      A42-22 (RR+) - M50-2 (RA+) Always Below 1 Ω
      A42-22 (RR+) or M50-2 (RA+) - Body ground Always 10 kΩ or higher
      A42-9 (RR-) - M50-1 (RA-) Always Below 1 Ω
      A42-9 (RR-) or M50-1 (RA-) - Body ground Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      A42-20 (RL+) - N58-2 (LA+) Always Below 1 Ω
      A42-20 (RL+) or N58-2 (LA+) - Body ground Always 10 kΩ or higher
      A42-7 (RL-) - N58-1 (LA-) Always Below 1 Ω
      A42-7 (RL-) or N58-1 (LA-) - 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 A42 skid control ECU (brake booster with master cylinder assembly) connector.
      GTY900686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for RH
      *B for LH
      *a Front view of wire harness connector
      (to Rear Speed Sensor (Rear Axle Hub and Bearing Assembly))
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - Body ground Ignition switch ON 5.7 to 14 V
      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - Body ground Ignition switch ON 5.7 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY. Refer to  REMOVAL [10/2019 - 08/2020] 

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [10/2019 - 08/2020] 

  9. CHECK REAR SPEED SENSOR INSTALLATION 
    1. Turn the ignition switch off.
      GTY898323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a No clearance
      *b OK
      *c NG
    2. Check the speed sensor installation.

      Refer to INSTALLATION [02/2019 - ]

      OK

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

      The installation bolt is tightened properly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL REAR SPEED SENSOR CORRECTLY. Refer to  INSTALLATION [02/2019 - ] 

    Result: 

    OK 

    See step  10

  10. 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 [11/2018 - ]

      for Speed Sensor Rotor: Refer to REMOVAL [10/2019 - 08/2020]

    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 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.
      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
      • Check the speed sensor signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [02/2019 - 08/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR 

    Result: 

    OK 

    See step  11

  11. INSPECT PARKING BRAKE WIRE ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY906989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for RH
      *B for LH
      *1 Skid Control Sensor Wire (Parking Brake Wire Assembly)
      *a Front view of wire harness connector
      (to Sensor Side Connector)
      *b Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Disconnect the M50 or N58 skid control sensor wire (parking brake wire assembly) connector.
    3. Disconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - MM3-3 Always Below 1 Ω
      M50-2 (RA+) or MM3-3 - Body ground and other terminals Always 10 kΩ or higher
      M50-1 (RA-) - MM3-4 Always Below 1 Ω
      M50-1 (RA-) or MM3-4 - Body ground and other terminals Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - NN6-3 Always Below 1 Ω
      N58-2 (LA+) or NN6-3 - Body ground and other terminals Always 10 kΩ or higher
      N58-1 (LA-) - NN6-4 Always Below 1 Ω
      N58-1 (LA-) or NN6-4 - Body ground and other terminals Always 10 kΩ or higher
      NOTE:

      Check the speed sensor signal after replacement.

      Refer to TEST MODE PROCEDURE [02/2019 - 08/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  12

  12. 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. Reconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.
    3. Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      A42-22 (RR+) - M50-2 (RA+) Always Below 1 Ω
      A42-22 (RR+) or M50-2 (RA+) - Body ground Always 10 kΩ or higher
      A42-9 (RR-) - M50-1 (RA-) Always Below 1 Ω
      A42-9 (RR-) or M50-1 (RA-) - Body ground Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      A42-20 (RL+) - N58-2 (LA+) Always Below 1 Ω
      A42-20 (RL+) or N58-2 (LA+) - Body ground Always 10 kΩ or higher
      A42-7 (RL-) - N58-1 (LA-) Always Below 1 Ω
      A42-7 (RL-) or N58-1 (LA-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT) 
    1. Reconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
      GTY900686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for RH
      *B for LH
      *a Front view of wire harness connector
      (to Rear Speed Sensor)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - Body ground Ignition switch ON 5.7 to 14 V
      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - Body ground Ignition switch ON 5.7 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR SPEED SENSOR. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [10/2019 - 08/2020] 

scientia non olet · About LEMON Manuals