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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 128 (Electronically Controlled Brake System - Diagnostic Codes (C1311-C1413) (Hybrid)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C1403: Malfunction in Rear Speed Sensor RH Circuit; DTC C1404: Malfunction in Rear Speed Sensor LH Circuit [04/2018 -] >> Procedure

DTC C1403: Malfunction in Rear Speed Sensor RH Circuit; DTC C1404: Malfunction in Rear Speed Sensor LH Circuit [04/2018 -]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [04/2018 -]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the power switch off.
    3. Turn the power switch on (IG).
    4. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [04/2018 -]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTC C1403 is output. A
      DTC C1404 is output. B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK REAR SPEED SENSOR RH INSTALLATION 
    1. Check the rear speed sensor RH installation.

      OK

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

      GTY423344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor RH
      *a OK
      *b NG
      *c No Clearance

      HINT: 

      Because the rear axle hub and bearing assembly RH cannot be disassembled, if the rear speed sensor RH needs replacement, replace the rear axle hub and bearing assembly RH.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    OK 

    See step  3

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

      Refer to DATA LIST / ACTIVE TEST [04/2018 -]

      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.: 326.4 km/h (203 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
    2. Check the rear speed sensor RH output value.

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

    Result: 

    NG 

    See step  4

  4. INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY 
    1. Turn the power switch off.
      GTY866191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire RH (No. 1 parking brake wire assembly)
      *b Front view of wire harness connector
      (to Sensor Side Connector)
      *c Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the Y5 and YK5 skid control sensor wire RH (No. 1 parking brake wire assembly) connectors.
    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

      Tester Connection Condition Specified Condition
      Y5-2 (RA+) - YK5-1 (RR+) Always Below 1 Ω
      Y5-2 (RA+) or YK5-1 (RR+) - Body ground and other terminals Always 10 kΩ or higher
      Y5-1 (RA-) - YK5-2 (RR-) Always Below 1 Ω
      Y5-1 (RA-) or YK5-2 (RR-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - NO. 1 PARKING BRAKE WIRE ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK

      The connector is securely connected.

    2. Disconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A35-7 (RR+) - YK5-1 (RR+) Always Below 1 Ω
      A35-7 (RR+) or YK5-1 (RR+) - Body ground Always 10 kΩ or higher
      A35-8 (RR-) - YK5-2 (RR-) Always Below 1 Ω
      A35-8 (RR-) or YK5-2 (RR-) - Body ground Always 10 kΩ or higher
      NOTE:

      Check the rear speed sensor RH signal after replacement.

      Refer to TEST MODE PROCEDURE [04/2018 - 08/2021] , or refer to TEST MODE PROCEDURE [08/2021 -]

      HINT: 

      The rear speed sensor RH and rear speed sensor rotor RH are incorporated into the rear axle hub and bearing assembly RH.

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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK REAR SPEED SENSOR LH INSTALLATION 
    1. Check the rear speed sensor LH installation.

      OK

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

      GTY423344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor LH
      *a OK
      *b NG
      *c No Clearance

      HINT: 

      Because the rear axle hub and bearing assembly LH cannot be disassembled, if the rear speed sensor LH needs replacement, replace the rear axle hub and bearing assembly LH.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    OK 

    See step  7

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

      Refer to DATA LIST / ACTIVE TEST [04/2018 -]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RL Wheel Speed Rear speed sensor LH Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      RL Wheel Speed
    2. Check the rear speed sensor LH output value.

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

    Result: 

    NG 

    See step  8

  8. INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY 
    1. Turn the power switch off.
      GTY866193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      *b Front view of wire harness connector
      (to Sensor Side Connector)
      *c Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the Y2 and YK6 skid control sensor wire LH (No. 2 parking brake wire assembly) connectors.
    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

      Tester Connection Condition Specified Condition
      Y2-2 (LA+) - YK6-1 (RL+) Always Below 1 Ω
      Y2-2 (LA+) or YK6-1 (RL+) - Body ground and other terminals Always 10 kΩ or higher
      Y2-1 (LA-) - YK6-2 (RL-) Always Below 1 Ω
      Y2-1 (LA-) or YK6-2 (RL-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - NO. 2 PARKING BRAKE WIRE ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK

      The connector is securely connected.

    2. Disconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A35-34 (RL+) - YK6-1 (RL+) Always Below 1 Ω
      A35-34 (RL+) or YK6-1 (RL+) - Body ground Always 10 kΩ or higher
      A35-35 (RL-) - YK6-2 (RL-) Always Below 1 Ω
      A35-35 (RL-) or YK6-2 (RL-) - Body ground Always 10 kΩ or higher
      NOTE:

      Check the rear speed sensor LH signal after replacement.

      Refer to TEST MODE PROCEDURE [04/2018 - 08/2021] , or refer to TEST MODE PROCEDURE [08/2021 -]

      HINT: 

      The rear speed sensor LH and rear speed sensor rotor LH are incorporated into the rear axle hub and bearing assembly LH.

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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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