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

A017FKVE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK TIRES


    1. Check the size and condition of all 4 wheels 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

    INSPECT EACH SPEED SENSOR Click here

    C

    REPLACE TIRES SO THAT ALL FOUR TIRES ARE SAME SIZE

    A

  2. CHECK EACH 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 EACH SPEED SENSOR

    OK

  3. CHECK EACH 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 rotors.

      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 shaft assembly.

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


    NG

    CLEAN OR REPLACE EACH SPEED SENSOR ROTOR

    OK

  4. INSPECT EACH 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.


    B

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

    C

    REPLACE EACH SPEED SENSOR

    A

  5. 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.


    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - EACH 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  8. 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

    B

    REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    A

  9. REPLACE EACH SPEED SENSOR


    1. Turn the ignition 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

  10. 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

  11. REPLACE EACH 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 here for front, or Click here for rear).

      Tech Tips


      • 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.


    NEXT

  12. 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

  13. 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.

      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

  14. 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