VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1337

DTC Code DTC Name
C1337 Diameter of the Tire is not Uniform

DESCRIPTION

The skid control ECU measures the speed of each wheel by receiving signals from the speed sensor.

These signals are used for recognizing that all 4 wheels are operating properly.

Therefore, all wheel signals must be equal.

DTC Code DTC Detection Condition Trouble Area
C1337

The following occurs in 3 consecutive trips:

At a vehicle speed of 20 km/h (12 mph) or more, there is a 20 % difference or greater in the average speed between the front wheels and rear wheels for 20 seconds or more.

  • Tire and wheel size

  • Tire deformation

  • Speed sensor rotor

  • Speed sensor

  • Speed sensor circuit

  • Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

A019ODOE01

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK TIRES


    1. Check the size and condition of all 4 tires Click here.

      Tech Tips

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

      OK
      The diameter of all 4 tires and air pressure are the same.
      Result
      Result Proceed to
      OK (Except for rear 2WD) A
      OK (for rear 2WD) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) Click here

    C

    REPLACE TIRES SO THAT ALL FOUR TIRES ARE SAME SIZE

    A

  2. CHECK SPEED SENSOR TIP


    1. Remove the front speed sensor or the rear speed sensor Click here for front, or Click here for rear).

    2. Check the speed sensor tip.

      OK
      No scratches, oil, or foreign matter on the sensor tip.

      Note

      Check the speed sensor signal after cleaning or replacement Click here.


    NG

    CLEAN OR REPLACE SPEED SENSOR

    OK

  3. CHECK SPEED SENSOR ROTOR


    1. Remove the front speed sensor rotor or the rear speed sensor rotor Click here for front, or Click here for rear).

    2. Check the speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the rotor.
      Result
      Result Proceed to
      NG A
      OK B

      Note

      Check the speed sensor signal after cleaning or replacement Click here.

      Tech Tips


      • If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.

      • If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.


    B

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR) Click here

    A

    CLEAN OR REPLACE SPEED SENSOR ROTOR

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)


    1. A019L74E01
      Text in Illustration
      *1 Skid Control Sensor Wire
      *2 for RH
      *3 Sensor Side Connector "A"
      *4 Vehicle Side Connector "B"
      *5 for LH
      *6 Sensor Side Connector "A"
      *7 Vehicle Side Connector "B"

      Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    2. Disconnect the skid control sensor wire.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A-2 - B-2 Always Below 1 Ω
      A-2 - B-1 Always 10 kΩ or higher
      A-2 - Body ground Always 10 kΩ or higher
      A-1 - B-1 Always Below 1 Ω
      A-1 - B-2 Always 10 kΩ or higher
      A-1 - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A-2 - B-3 Always Below 1 Ω
      A-2 - B-1 Always 10 kΩ or higher
      A-2 - Body ground Always 10 kΩ or higher
      A-1 - B-1 Always Below 1 Ω
      A-1 - B-3 Always 10 kΩ or higher
      A-1 - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR)


    1. A019KU7E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to Front Speed Sensor)
      *3

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Reconnect the skid control sensor wire (for 2WD).

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

    3. Disconnect the skid control ECU connector.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A44-7 (FR+) - A37-2 (FR+) Always Below 1 Ω
      A44-7 (FR+) - Body ground Always 10 kΩ or higher
      A44-6 (FR-) - A37-1 (FR-) Always Below 1 Ω
      A44-6 (FR-) - Body ground Always 10 kΩ or higher
      A44-17 (RR+) - R3-2 (RR+) Always Below 1 Ω
      A44-17 (RR+) - Body ground Always 10 kΩ or higher
      A44-16 (RR-) - R3-1 (RR-) Always Below 1 Ω
      A44-16 (RR-) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A44-19 (FL+) - A36-2 (FL+) Always Below 1 Ω
      A44-19 (FL+) - Body ground Always 10 kΩ or higher
      A44-18 (FL-) - A36-1 (FL-) Always Below 1 Ω
      A44-18 (FL-) - Body ground Always 10 kΩ or higher
      A44-5 (RL+) - R1-3 (RL+) Always Below 1 Ω
      A44-5 (RL+) - Body ground Always 10 kΩ or higher
      A44-4 (RL-) - R1-1 (RL-) Always Below 1 Ω
      A44-4 (RL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. A019PCKE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Speed Sensor)
      *2

      Front view of wire harness connector

      (to Rear Speed Sensor)

      Reconnect the skid control ECU connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      for RH
      Tester Connection Switch Condition Specified Condition
      A37-2 (FR+) - Body ground Engine switch on (IG) 8 to 14 V
      R3-2 (RR+) - Body ground Engine switch on (IG) 8 to 14 V
      for LH
      Tester Connection Switch Condition Specified Condition
      A36-2 (FL+) - Body ground Engine switch on (IG) 8 to 14 V
      R1-3 (RL+) - Body ground Engine switch on (IG) 8 to 14 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  7. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Reconnect the speed sensor connectors.

    3. Clear the DTCs Click here.

    4. Start the engine.

    5. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    6. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1337) is output (Except for rear 2WD) A
      DTC (C1337) is output (for rear 2WD) B
      DTC (C1337) is not output C

    B

    REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  8. REPLACE SPEED SENSOR


    1. Turn the engine switch off.

    2. Replace the front speed sensor or the rear speed sensor Click here for front, or Click here for rear).

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  9. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1337) is output A
      DTC (C1337) is not output B

    B

    END

    A

  10. REPLACE SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Remove the front drive shaft assembly Click here for 2GR-FE, or Click here for 1AR-FE).

    3. Replace the front drive outboard joint shaft assembly (front speed sensor rotor) Click here for 2GR-FE, or Click here for 1AR-FE).

    4. Replace the rear axle hub and bearing assembly (rear speed sensor rotor) Click here.

      Tech Tips


      • If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.

      • If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  11. RECONFIRM DTC


    1. Install the drive shaft assembly (for front).

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1337) is output A
      DTC (C1337) is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  12. REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR


    1. Turn the engine switch off.

    2. Replace the rear speed sensor and the rear axle hub and bearing assembly (rear speed sensor rotor) Click here.

      Tech Tips

      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 it together with the rear axle hub and bearing assembly with rear speed sensor.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  13. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1337) is output A
      DTC (C1337) is not output B

    B

    END

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here