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Home >> Toyota >> 2021 >> Camry LE, FWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Stability Control System (W/O Electric Parking Brake System) - Diagnostic Codes (2 Of 3) (Except Hybrid) >> VEHICLE STABILITY CONTROL SYSTEM (w/o Electric Parking Brake System) >> DTC C1237: Speed Sensor Rotor Faulty [06/2017 - 10/2020] >> Procedure

DTC C1237: Speed Sensor Rotor Faulty [06/2017 - 10/2020]: Procedure

  1. CHECK DTC 
    1. Check the DTCs that are output.

      Chassis > ABS/VSC/TRAC/EPB > Trouble Codes 

      Result

      Result Proceed to
      C1237 and C1330, C1331, C1332, C1333, 1464, C1465, C1466, C1467 are output simultaneously A
      C1237 is output B

    Result: 

    A 

    GO TO DTCS (C1330, C1331, C1332, C1333, 1464, C1465, C1466 and/or C1467). Refer to  DTC C1330: Open in Front Speed Sensor RH; DTC C1331: Open in Front Speed Sensor LH; DTC C1332: Open in Rear Speed Sensor RH; DTC C1333: Open in Rear Speed Sensor LH; DTC C1464: Front Speed Sensor RH; DTC C1465: Front Speed Sensor LH; DTC C1466: Rear Speed Sensor RH; DTC C1467: Rear Speed Sensor LH [06/2017 - 10/2020]  

    Result: 

    B 

    See step  2

  2. CHECK TIRES 
    1. Check the size and condition of all four tires.

      Refer to INSPECTION [06/2017 - 09/2019] , or refer to INSPECTION [09/2019 - 03/2020] , or refer to INSPECTION [03/2020 - ]

      HINT: 

      The DTC is output when tire deformation or a difference in tire size is detected.

      OK

      The diameter and tire pressure of all four tires are the same.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM (SPEED SENSOR) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.

      Chassis > ABS/VSC/TRAC/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading 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
      FL Wheel Speed Front wheel speed sensor LH reading 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
      RR Wheel Speed Rear wheel speed sensor RH reading 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
      RL Wheel Speed Rear wheel speed sensor LH reading 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/EPB > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed
    4. Check the speed sensor output value.

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Result Proceed to
      OK A
      NG (The output value for front speed sensor RH does not change in accordance with the vehicle speed) B
      NG (The output value for front speed sensor LH does not change in accordance with the vehicle speed) C
      NG (The output value for rear speed sensor RH (rear axle hub and bearing assembly RH) does not change in accordance with the vehicle speed) D
      NG (The output value for rear speed sensor LH (rear axle hub and bearing assembly LH) does not change in accordance with the vehicle speed) E
      NG (The output value of 2 or more sensors does not change in accordance with the vehicle speed) F

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  9

    Result: 

    D 

    See step  13

    Result: 

    E 

    See step  16

    Result: 

    F 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2017 - 10/2020] 

    Result: 

    A 

    See step  4

  4. PERFORM TEST MODE INSPECTION (SIGNAL CHECK) 
    1. Turn the ignition switch off.
    2. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.
    3. Perform the sensor check using Test Mode (Signal Check) Procedure.

      Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      Chassis > ABS/VSC/TRAC/EPB > Utility 

      Tester Display
      Signal Check

      OK

      All Test Mode (Signal Check) inspection items change from incomplete to complete.

      Result

      Result Proceed to
      OK A
      NG (The Test Mode (Signal Check) inspection item for front speed sensor RH does not change from incomplete to complete) B
      NG (The Test Mode (Signal Check) inspection item for front speed sensor LH does not change from incomplete to complete) C
      NG (The Test Mode (Signal Check) inspection item for rear speed sensor RH (rear axle hub and bearing assembly RH) does not change from incomplete to complete) D
      NG (The Test Mode (Signal Check) inspection item for rear speed sensor LH (rear axle hub and bearing assembly LH) does not change from incomplete to complete) E
      NG (The Test Mode (Signal Check) inspection item for 2 or more sensors does not change from incomplete to complete) F

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2017 - 08/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 03/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2020 - 10/2020] 

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  9

    Result: 

    D 

    See step  13

    Result: 

    E 

    See step  16

    Result: 

    F 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2017 - 10/2020] 

  5. CHECK FRONT SPEED SENSOR RH INSTALLATION 
    1. Turn the ignition switch off.
      GTY453396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Speed Sensor RH
      *a Correct
      *b Incorrect
      *c 8.5 N*m
      *d No clearance
    2. Check the front speed sensor RH installation.

      OK

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

      The installation bolt is tightened properly.

      Torque 

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL OR REPLACE FRONT SPEED SENSOR RH. Refer to  REMOVAL [06/2017 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK FRONT SPEED SENSOR RH (CHECK FOR FOREIGN MATTER) 
    1. Remove the front speed sensor RH.

      Refer to REMOVAL [06/2017 - ]

    2. Check the front speed sensor RH tip.

      OK

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

      NOTE:
      • If there is oil or foreign matter on the front speed sensor RH, clean the front speed sensor RH.
      • If the front speed sensor RH is damaged, replace the front speed sensor RH with a new one.
      • Check the front speed sensor RH signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CLEAN OR REPLACE FRONT SPEED SENSOR RH 

    Result: 

    OK 

    See step  7

  7. CHECK FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER) 
    1. Remove the front speed sensor rotor RH (front axle hub sub-assembly RH).

      Refer to REMOVAL [06/2017 - 09/2019] , or refer to REMOVAL [09/2019 - 10/2020]

    2. Check the front speed sensor rotor RH.

      OK

      The front speed sensor rotor RH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the front speed sensor rotor RH, clean the front speed sensor rotor RH.
      • If the front speed sensor rotor RH is damaged, replace the front speed sensor rotor RH with a new one.
      • Check the front speed sensor RH signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      HINT: 

      • The front speed sensor rotor RH is incorporated into the front axle hub sub-assembly RH.
      • If the front speed sensor rotor RH needs to be replaced, replace it together with the front axle hub sub-assembly RH.

      Result

      Result Proceed to
      OK A
      NG (The front speed sensor rotor RH is damaged.) B
      NG (There is foreign matter on the front speed sensor rotor RH.) C

    Result: 

    B 

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH. Refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 10/2020] 

    Result: 

    C 

    CLEAN FRONT SPEED SENSOR ROTOR RH 

    Result: 

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR RH) 
    1. Turn the ignition switch off.
    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 A33 skid control ECU (brake actuator 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

      Tester Connection Condition Specified Condition
      A33-4 (FR-) - A35-2 (FR-) Always Below 1 Ω
      A33-16 (FR+) - A35-1 (FR+) Always Below 1 Ω
      A33-4 (FR-) or A35-2 (FR-) - Body ground Always 10 kΩ or higher
      A33-16 (FR+) or A35-1 (FR+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR RH. Refer to  REMOVAL [06/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK FRONT SPEED SENSOR LH INSTALLATION 
    1. Turn the ignition switch off.
      GTY453396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Speed Sensor LH
      *a Correct
      *b Incorrect
      *c 8.5 N*m
      *d No clearance
    2. Check the front speed sensor LH installation.

      OK

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

      The installation bolt is tightened properly.

      Torque 

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL OR REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [06/2017 - ] 

    Result: 

    OK 

    See step  10

  10. CHECK FRONT SPEED SENSOR LH (CHECK FOR FOREIGN MATTER) 
    1. Remove the front speed sensor LH.

      Refer to REMOVAL [06/2017 - ]

    2. Check the front speed sensor LH tip.

      OK

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

      NOTE:
      • If there is oil or foreign matter on the front speed sensor LH, clean the front speed sensor LH.
      • If the front speed sensor LH is damaged, replace the front speed sensor LH with a new one.
      • Check the front speed sensor LH signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CLEAN OR REPLACE FRONT SPEED SENSOR LH 

    Result: 

    OK 

    See step  11

  11. CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER) 
    1. Remove the front speed sensor rotor LH (front axle hub sub-assembly LH).

      Refer to REMOVAL [06/2017 - 09/2019] , or refer to REMOVAL [09/2019 - 10/2020]

    2. Check the front speed sensor rotor LH.

      OK

      The front speed sensor rotor LH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the front speed sensor rotor LH, clean the front speed sensor rotor LH.
      • If the front speed sensor rotor LH is damaged, replace the front speed sensor rotor LH with a new one.
      • Check the front speed sensor LH signal after cleaning or replacement.

        Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      HINT: 

      • The front speed sensor rotor LH is incorporated into the front axle hub sub-assembly LH.
      • If the front speed sensor rotor LH needs to be replaced, replace it together with the front axle hub sub-assembly LH.

      Result

      Result Proceed to
      OK A
      NG (The front speed sensor rotor LH is damaged.) B
      NG (There is foreign matter on the front speed sensor rotor LH.) C

    Result: 

    B 

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 10/2020] 

    Result: 

    C 

    CLEAN FRONT SPEED SENSOR ROTOR LH 

    Result: 

    A 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR LH) 
    1. Turn the ignition switch off.
    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 A33 skid control ECU (brake actuator 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

      Tester Connection Condition Specified Condition
      A33-8 (FL-) - A36-2 (FL-) Always Below 1 Ω
      A33-19 (FL+) - A36-1 (FL+) Always Below 1 Ω
      A33-8 (FL-) or A36-2 (FL-) - Body ground Always 10 kΩ or higher
      A33-19 (FL+) or A36-1 (FL+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [06/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK REAR SPEED SENSOR RH INSTALLATION 
    1. Turn the ignition switch off.
      GTY423344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor RH
      *a OK
      *b NG
      *c No Clearance
    2. Check the rear speed sensor RH installation.

      OK

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

      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 [03/2017 - ] 

    Result: 

    OK 

    See step  14

  14. INSPECT SKID CONTROL SENSOR WIRE RH 
    1. Turn the ignition switch off.
      GTY932332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire RH
      *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. Remove the skid control sensor wire RH.
    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
      f1-1 (RR-) - fR1-2 (RR-) Always Below 1 Ω
      f1-2 (RR+) - fR1-1 (RR+) Always Below 1 Ω
      f1-1 (RR-) - fR1-1 (RR+) Always 10 kΩ or higher
      f1-1 (RR-) or fR1-2 (RR-) - Body ground Always 10 kΩ or higher
      f1-2 (RR+) or fR1-1 (RR+) - Body ground Always 10 kΩ or higher
      NOTE:

      Check the rear speed sensor RH signal after replacement.

      Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL SENSOR WIRE RH 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE RH) 
    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 A33 skid control ECU (brake actuator 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
      A33-29 (RR-) - fR1-2 (RR-) Always Below 1 Ω
      A33-17 (RR+) - fR1-1 (RR+) Always Below 1 Ω
      A33-29 (RR-) or fR1-2 (RR-) - Body ground Always 10 kΩ or higher
      A33-17 (RR+) or fR1-1 (RR+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK REAR SPEED SENSOR LH INSTALLATION 
    1. Turn the ignition switch off.
      GTY423344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor LH
      *a OK
      *b NG
      *c No Clearance
    2. Check the rear speed sensor LH installation.

      OK

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

      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 [03/2017 - ] 

    Result: 

    OK 

    See step  17

  17. INSPECT SKID CONTROL SENSOR WIRE LH 
    1. Turn the ignition switch off.
      GTY866114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH
      *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. Remove the skid control sensor wire LH.
    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
      g1-1 (RL-) - gR1-2 (RL-) Always Below 1 Ω
      g1-2 (RL+) - gR1-1 (RL+) Always Below 1 Ω
      g1-1 (RL-) - gR1-1 (RL+) Always 10 kΩ or higher
      g1-1 (RL-) or gR1-2 (RL-) - Body ground Always 10 kΩ or higher
      g1-2 (RL+) or gR1-1 (RL+) - Body ground Always 10 kΩ or higher
      NOTE:

      Check the rear speed sensor LH signal after replacement.

      Refer to TEST MODE PROCEDURE [06/2017 - 10/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL SENSOR WIRE LH 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE LH) 
    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 A33 skid control ECU (brake actuator 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
      A33-18 (RL-) - gR1-2 (RL-) Always Below 1 Ω
      A33-31 (RL+) - gR1-1 (RL+) Always Below 1 Ω
      A33-18 (RL-) or gR1-2 (RL-) - Body ground Always 10 kΩ or higher
      A33-31 (RL+) or gR1-1 (RL+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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