DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM, Diagnostic DTC:C1337/91

DTC Code DTC Name
C1337/91 Diameter of the Tire is not Uniform

DESCRIPTION

The 4WD ECU assembly outputs this DTC if a difference in tire size is detected.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
C1337/91 Diameter of the Tire is not Uniform When the vehicle speed is 30 km/h or more, the difference between the average speed of the front and rear wheels is 4% or more for 36 seconds or more.

  • Tire size or pressure (front and rear tires)

  • Front speed sensor

  • Rear speed sensor

  • Front speed sensor rotor (Front drive shaft assembly)

  • Rear speed sensor rotor (Rear axle hub and bearing assembly)

  • Wire harness and connector

  • Skid control ECU (Brake actuator assembly)

  • 4WD ECU assembly

 DTC stored

WIRING DIAGRAM

B003ZKZE03

CAUTION / NOTICE / HINT

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. CHECK TIRE CONDITION


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

      Click here

      Tech Tips

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

      OK
      The diameter and air pressure of all 4 tires are the same.
      Result
      Proceed to
      OK
      NG

    NG

    PERFORM AIR PRESSURE ADJUSTMENT OR REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE Click here

    OK

  2. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more so that the same DTC is output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes

    4. Check if speed sensor DTCs (brake control system DTCs) are output.

      Click here


      Chassis > ABS/VSC/TRAC > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTC C1377/91 is output A
      DTCs are not output B
      Speed sensor DTCs (brake control system DTC) are output C

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (BRAKE CONTROL SYSTEM) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (SPEED SENSOR - BRAKE ACTUATOR ASSEMBLY)


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

    2. Turn the ignition switch off.

    3. Disconnect the A47 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the A34, A35, O3 and/or O2 speed sensor connector(s).

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

      Standard Resistance
      for Front RH:
      Tester Connection Condition Specified Condition
      A47-7 (FR+) - A35-2 (FR+) Always Below 1 Ω
      A47-7 (FR+) or A35-2 (FR+) - Body ground Always 10 kΩ or higher
      A47-6 (FR-) - A35-1 (FR-) Always Below 1 Ω
      A47-6 (FR-) or A35-1 (FR-) - Body ground Always 10 kΩ or higher
      for Front LH:
      Tester Connection Condition Specified Condition
      A47-19 (FL+) - A34-2 (FL+) Always Below 1 Ω
      A47-19 (FL+) or A34-2 (FL+) - Body ground Always 10 kΩ or higher
      A47-18 (FL-) - A34-1 (FL-) Always Below 1 Ω
      A47-18 (FL-) or A34-1 (FL-) - Body ground Always 10 kΩ or higher
      for Rear RH:
      Tester Connection Condition Specified Condition
      A47-17 (RR+) - O3-2 (RR+) Always Below 1 Ω
      A47-17 (RR+) or O3-2 (RR+) - Body ground Always 10 kΩ or higher
      A47-16 (RR-) - O3-1 (RR-) Always Below 1 Ω
      A47-16 (RR-) or O3-1 (RR-) - Body ground Always 10 kΩ or higher
      for Rear LH:
      Tester Connection Condition Specified Condition
      A47-5 (RL+) - O2-3 (RL+) Always Below 1 Ω
      A47-5 (RL+) or O2-3 (RL+) - Body ground Always 10 kΩ or higher
      A47-4 (RL-) - O2-1 (RL-) Always Below 1 Ω
      A47-4 (RL-) or O2-1 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

    2. Perform the sensor check in the Test Mode procedure.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      All Test Mode DTCs are cleared.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK SPEED SENSOR ROTOR Click here

    OK

  5. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that the same DTC is output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes
      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

  6. CHECK SPEED SENSOR ROTOR


    1. Turn the ignition switch off.

    2. Remove the front speed sensor rotor (front drive shaft assembly) or rear speed sensor rotor (rear axle hub and bearing assembly).

      For front: Click here

      For rear: Click here

    3. 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 axle hub and bearing assembly.

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE SPEED SENSOR ROTOR

    OK

  7. REPLACE SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the front speed sensor or the rear speed sensor.

      For front: Click here

      For rear: Click here

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that the same DTC is output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes

      Tech Tips

      Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking DTCs.

      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    B

    END

    A

  9. REPLACE BRAKE ACTUATOR ASSEMBLY


    1. Replace the skid control ECU (brake actuator assembly).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > Four Wheel Drive > Clear DTCs

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that the same DTC is output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes
      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    A

    REPLACE 4WD ECU ASSEMBLY Click here

    B

    END