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Home >> Toyota >> 2021 >> RAV4 LE, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C050C-49: Left Rear Wheel Speed Sensor Internal Electronic Failure; DTC C0512-49: Right Rear Wheel Speed Sensor Internal Electronic Failure [11/2018 - 10/2019] >> Procedure

DTC C050C-49: Left Rear Wheel Speed Sensor Internal Electronic Failure; DTC C0512-49: Right Rear Wheel Speed Sensor Internal Electronic Failure [11/2018 - 10/2019]: Procedure

  1. CHECK VEHICLE 
    1. Check the vehicle specification.

      Result

      Result Proceed to
      for 2WD A
      for AWD B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SENSOR CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY939960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of skid control sensor wire (parking brake wire assembly)
      (to Rear Speed Sensor (Rear Axle Hub and Bearing Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the M50 or N58 rear speed sensor (rear axle hub and bearing assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - N58-1 (LA-) Ignition switch ON 11 to 14 V
      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - M50-1 (RA-) Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY900687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of skid control sensor wire (parking brake wire assembly)
      (to Rear Speed Sensor (Rear Axle Hub and Bearing Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the M50 or N58 rear speed sensor (rear axle hub and bearing assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - Body ground Ignition switch off Below 1.5 V
      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - Body ground Ignition switch off Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. INSPECT PARKING BRAKE WIRE ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY941349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *1 Front view of 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)

      OK

      The connector is securely connected.

    2. Disconnect the M50 or N58 rear speed sensor (rear axle hub and bearing assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR LH

      Tester Connection Condition Specified Condition
      N58-1 (LA-) or NN2-4 - Body ground and other terminals Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      M50-1 (RA-) or MM2-4 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-4 or A39-23 (RL-) - Body ground Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-4 or A39-37 (RR-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY. Refer to  REMOVAL [11/2018 - 02/2019]  , or refer to  REMOVAL [02/2019 - 10/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY842070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire (Parking Brake Wire Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-3 - Body ground Ignition switch off Below 1.5 V
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-3 - Body ground Ignition switch off Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY842070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire (Parking Brake Wire Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-3 - Body ground Always Below 1.5 V
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-3 - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (SENSOR CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY842070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire (Parking Brake Wire Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-3 - NN2-4 Ignition switch ON 11 to 14 V
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-3 - MM2-4 Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    NG 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY842070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire (Parking Brake Wire Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-3 - Body ground Ignition switch ON 11 to 14 V
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-3 - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY842070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire (Parking Brake Wire Assembly))

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-4 - Body ground Always Below 1.5 V
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-4 - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-4 - A39-23 (RL-) Always Below 1 Ω
      NN2-3 or A39-39 (RL+) - NN2-4 or A39-23 (RL-) Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-4 - A39-37 (RR-) Always Below 1 Ω
      MM2-3 or A39-22 (RR+) - MM2-4 or A39-37 (RR-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-3 - A39-39 (RL+) Always Below 1 Ω
      NN2-3 or A39-39 (RL+) - Body ground Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-3 - A39-22 (RR+) Always Below 1 Ω
      MM2-3 or A39-22 (RR+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (SENSOR CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY939960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of skid control sensor wire (parking brake wire assembly)
      (to Rear Speed Sensor)

      OK

      The connector is securely connected.

    2. Disconnect the M50 or N58 rear speed sensor connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - N58-1 (LA-) Ignition switch ON 11 to 14 V
      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - M50-1 (RA-) Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY900687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *a Front view of skid control sensor wire (parking brake wire assembly)
      (to Rear Speed Sensor)

      OK

      The connector is securely connected.

    2. Disconnect the M50 or N58 rear speed sensor connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR LH

      Tester Connection Condition Specified Condition
      N58-2 (LA+) - Body ground Ignition switch off Below 1.5 V
      FOR RH

      Tester Connection Condition Specified Condition
      M50-2 (RA+) - Body ground Ignition switch off Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  15

  15. INSPECT PARKING BRAKE WIRE ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY941349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for LH
      *B for RH
      *1 Front view of 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)

      OK

      The connector is securely connected.

    2. Disconnect the M50 or N58 rear speed sensor connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR LH

      Tester Connection Condition Specified Condition
      N58-1 (LA-) or NN2-4 - Body ground and other terminals Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      M50-1 (RA-) or MM2-4 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the MM2 or NN2 skid control sensor wire (parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR LH

      Tester Connection Condition Specified Condition
      NN2-4 or A39-23 (RL-) - Body ground Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      MM2-4 or A39-37 (RR-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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