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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1337

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DTC Code DTC Name
C1337 Diameter of the Tire is not Uniform
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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)
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

When replacing the brake actuator assembly, perform zero point calibration (Click here).

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PROCEDURE


  1. Click here

    CHECK TIRES


    1. Check the size and condition of all 4 wheels (Click here).

      Tip:

      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

  2. Click here

    CHECK SPEED SENSOR TIP


    1. Remove the front speed sensor or the rear speed sensor (Click herefor front, orClick herefor 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).


  3. Click here

    CHECK SPEED SENSOR ROTOR


    1. Remove the front speed sensor rotor or the rear speed sensor rotor (Click herefor front, orClick herefor rear).

    2. Check the speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the rotors.
      Note:

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

      Tip:

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

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


  4. Click here

    INSPECT SPEED SENSOR


    1. A017DSCE02

      Install the speed sensor and the speed sensor rotor.

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

    3. Disconnect each speed sensor connector.

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

      Standard resistance
      for 2WD RH
      Tester Connection Condition Specified Condition
      2 (FR+) - Body ground Always 10 kΩ or higher
      1 (FR-) - Body ground Always 10 kΩ or higher
      2 (RR+) - Body ground Always 10 kΩ or higher
      1 (RR-) - Body ground Always 10 kΩ or higher
      for 4WD RH
      Tester Connection Condition Specified Condition
      2 (FR+) - Body ground Always 10 kΩ or higher
      1 (FR-) - Body ground Always 10 kΩ or higher
      1 (RR+) - Body ground Always 10 kΩ or higher
      2 (RR-) - Body ground Always 10 kΩ or higher
      for 2WD LH
      Tester Connection Condition Specified Condition
      2 (FL+) - Body ground Always 10 kΩ or higher
      1 (FL-) - Body ground Always 10 kΩ or higher
      2 (RL+) - Body ground Always 10 kΩ or higher
      1 (RL-) - Body ground Always 10 kΩ or higher
      for 4WD LH
      Tester Connection Condition Specified Condition
      2 (FL+) - Body ground Always 10 kΩ or higher
      1 (FL-) - Body ground Always 10 kΩ or higher
      1 (RL+) - Body ground Always 10 kΩ or higher
      2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for rear 2WD) A
      OK (Except for rear 2WD) B
      NG C
      Note:

      Check the speed sensor signal after replacement (Click here).


  5. Click here

    CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)


    1. A017G3GE02

      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
      z10 ("A"-2) - z10 ("B"-1) Always Below 1 Ω
      z10 ("A"-2) - z10 ("B"-2) Always 10 kΩ or higher
      z10 ("A"-2) - Body ground Always 10 kΩ or higher
      z10 ("A"-1) - z10 ("B"-2) Always Below 1 Ω
      z10 ("A"-1) - z10 ("B"-1) Always 10 kΩ or higher
      z10 ("A"-1) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      z9 ("A"-2) - z9 ("B"-1) Always Below 1 Ω
      z9 ("A"-2) - z9 ("B"-2) Always 10 kΩ or higher
      z9 ("A"-2) - Body ground Always 10 kΩ or higher
      z9 ("A"-1) - z9 ("B"-2) Always Below 1 Ω
      z9 ("A"-1) - z9 ("B"-1) Always 10 kΩ or higher
      z9 ("A"-1) - Body ground Always 10 kΩ or higher
      Note:

      Check the speed sensor signal after replacement (Click here).


  6. Click here

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


    1. A017CJDE03

      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 2WD RH
      Tester Connection Condition Specified Condition
      A24-7 (FR+) - A25-2 (FR+) Always Below 1 Ω
      A24-7 (FR+) - Body ground Always 10 kΩ or higher
      A24-6 (FR-) - A25-1 (FR-) Always Below 1 Ω
      A24-6 (FR-) - Body ground Always 10 kΩ or higher
      A24-17 (RR+) - z10-2 (RR+) Always Below 1 Ω
      A24-17 (RR+) - Body ground Always 10 kΩ or higher
      A24-16 (RR-) - z10-1 (RR-) Always Below 1 Ω
      A24-16 (RR-) - Body ground Always 10 kΩ or higher
      for 4WD RH
      Tester Connection Condition Specified Condition
      A24-7 (FR+) - A25-2 (FR+) Always Below 1 Ω
      A24-7 (FR+) - Body ground Always 10 kΩ or higher
      A24-6 (FR-) - A25-1 (FR-) Always Below 1 Ω
      A24-6 (FR-) - Body ground Always 10 kΩ or higher
      A24-17 (RR+) - N22-1 (RR+) Always Below 1 Ω
      A24-17 (RR+) - Body ground Always 10 kΩ or higher
      A24-16 (RR-) - N22-2 (RR-) Always Below 1 Ω
      A24-16 (RR-) - Body ground Always 10 kΩ or higher
      for 2WD LH
      Tester Connection Condition Specified Condition
      A24-19 (FL+) - A14-2 (FL+) Always Below 1 Ω
      A24-19 (FL+) - Body ground Always 10 kΩ or higher
      A24-18 (FL-) - A14-1 (FL-) Always Below 1 Ω
      A24-18 (FL-) - Body ground Always 10 kΩ or higher
      A24-5 (RL+) - z9-2 (RL+) Always Below 1 Ω
      A24-5 (RL+) - Body ground Always 10 kΩ or higher
      A24-4 (RL-) - z9-1 (RL-) Always Below 1 Ω
      A24-4 (RL-) - Body ground Always 10 kΩ or higher
      for 4WD LH
      Tester Connection Condition Specified Condition
      A24-19 (FL+) - A14-2 (FL+) Always Below 1 Ω
      A24-19 (FL+) - Body ground Always 10 kΩ or higher
      A24-18 (FL-) - A14-1 (FL-) Always Below 1 Ω
      A24-18 (FL-) - Body ground Always 10 kΩ or higher
      A24-5 (RL+) - O40-1 (RL+) Always Below 1 Ω
      A24-5 (RL+) - Body ground Always 10 kΩ or higher
      A24-4 (RL-) - O40-2 (RL-) Always Below 1 Ω
      A24-4 (RL-) - Body ground Always 10 kΩ or higher

  7. Click here

    INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. A017FM5E03

      Reconnect the skid control ECU connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      for 2WD RH
      Tester Connection Switch Condition Specified Condition
      A25-2 (FR+) - Body ground Ignition switch on (IG) 8 to 14 V
      z10-2 (RR+) - Body ground Ignition switch on (IG) 8 to 14 V
      for 4WD RH
      Tester Connection Switch Condition Specified Condition
      A25-2 (FR+) - Body ground Ignition switch on (IG) 8 to 14 V
      N22-1 (RR+) - Body ground Ignition switch on (IG) 8 to 14 V
      for 2WD LH
      Tester Connection Switch Condition Specified Condition
      A14-2 (FL+) - Body ground Ignition switch on (IG) 8 to 14 V
      z9-2 (RL+) - Body ground Ignition switch on (IG) 8 to 14 V
      for 4WD LH
      Tester Connection Switch Condition Specified Condition
      A14-2 (FL+) - Body ground Ignition switch on (IG) 8 to 14 V
      O40-1 (RL+) - Body ground Ignition switch on (IG) 8 to 14 V

  8. Click here

    RECONFIRM DTC


    1. Turn the ignition 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

  9. Click here

    REPLACE SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the front speed sensor or the rear speed sensor (Click herefor front, orClick herefor rear).

      Note:

      Check the speed sensor signal after replacement (Click here).


  10. Click here

    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

  11. Click here

    REPLACE SPEED SENSOR ROTOR


    1. Turn the ignition switch off.

    2. Replace the front drive shaft assembly (front speed sensor rotor) or rear drive shaft assembly (rear speed sensor rotor) (Click herefor front, orClick herefor rear).

      Tip:

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

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

      Note:

      Check the speed sensor signal after replacement (Click here).


  12. Click here

    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

  13. Click here

    REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor (Click here).

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

      Tip:

      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).


  14. Click here

    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

  15. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

  16. Click here

    REPLACE TIRES SO THAT ALL FOUR TIRES ARE SAME SIZE

  17. Click here

    CLEAN OR REPLACE SPEED SENSOR

  18. Click here

    CLEAN OR REPLACE SPEED SENSOR ROTOR

  19. Click here

    REPLACE SPEED SENSOR

  20. Click here

    REPLACE SKID CONTROL SENSOR WIRE

  21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. Click here

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)Click here

  23. Click here

    END