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
C1337/91 Diameter of the Tire is not Uniform

When the following continues for 36 seconds or more:

At a vehicle speed of 30 km/h (18.6 mph) or more, the average speed difference between the front wheel and rear wheel is 4% or more.

  • Tire size or pressure (front and rear tires)

  • Speed sensor circuit

  • Front speed sensor

  • Rear speed sensor

  • Front speed sensor rotor (Front axle hub sub-assembly)

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

  • Harness and connector

  • Skid control ECU (Brake actuator assembly)

  • 4WD ECU assembly

WIRING DIAGRAM

A01KAQKE04

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.

      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

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

    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 the speed sensor DTC (brake control system DTC) is output.

      w/o VSC: Click here

      w/ VSC: Click here


      Chassis > ABS/VSC/TRC > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only "C1377/91" is output A
      DTC is not output B
      Speed sensor DTC (brake control system DTC) is output (w/o VSC) C
      Speed sensor DTC (brake control system DTC) is output (w/ VSC) D

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    C

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

    D

    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 power switch off.

    3. w/o VSC:

      Disconnect the A63 skid control ECU (brake actuator assembly) connector.

      w/ VSC:

      Disconnect the A64 skid control ECU (brake actuator assembly) connector.

    4. Disconnect the A14, A43, M20 and/or N11 speed sensor connector(s).

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

      Standard Resistance (w/o VSC)
      for Front RH:
      Tester Connection Condition Specified Condition
      A63-7 (FR+) - A43-1 (FR+) Always Below 1 Ω
      A63-7 (FR+) or A43-1 (FR+) - Body ground Always 10 kΩ or higher
      A63-6 (FR-) - A43-2 (FR-) Always Below 1 Ω
      A63-6 (FR-) or A43-2 (FR-) - Body ground Always 10 kΩ or higher
      for Front LH:
      Tester Connection Condition Specified Condition
      A63-19 (FL+) - A14-1 (FL+) Always Below 1 Ω
      A63-19 (FL+) or A14-1 (FL+) - Body ground Always 10 kΩ or higher
      A63-18 (FL-) - A14-2 (FL-) Always Below 1 Ω
      A63-18 (FL-) or A14-2 (FL-) - Body ground Always 10 kΩ or higher
      for Rear RH:
      Tester Connection Condition Specified Condition
      A63-17 (RR+) - M20-1 (RR+) Always Below 1 Ω
      A63-17 (RR+) or M20-1 (RR+) - Body ground Always 10 kΩ or higher
      A63-16 (RR-) - M20-2 (RR-) Always Below 1 Ω
      A63-16 (RR-) or M20-2 (RR-) - Body ground Always 10 kΩ or higher
      for Rear LH:
      Tester Connection Condition Specified Condition
      A63-5 (RL+) - N11-1 (RL+) Always Below 1 Ω
      A63-5 (RL+) or N11-1 (RL+) - Body ground Always 10 kΩ or higher
      A63-4 (RL-) - N11-2 (RL-) Always Below 1 Ω
      A63-4 (RL-) or N11-2 (RL-) - Body ground Always 10 kΩ or higher
      Standard Resistance (w/ VSC)
      for Front RH:
      Tester Connection Condition Specified Condition
      A64-7 (FR+) - A43-1 (FR+) Always Below 1 Ω
      A64-7 (FR+) or A43-1 (FR+) - Body ground Always 10 kΩ or higher
      A64-6 (FR-) - A43-2 (FR-) Always Below 1 Ω
      A64-6 (FR-) or A43-2 (FR-) - Body ground Always 10 kΩ or higher
      for Front LH:
      Tester Connection Condition Specified Condition
      A64-19 (FL+) - A14-1 (FL+) Always Below 1 Ω
      A64-19 (FL+) or A14-1 (FL+) - Body ground Always 10 kΩ or higher
      A64-18 (FL-) - A14-2 (FL-) Always Below 1 Ω
      A64-18 (FL-) or A14-2 (FL-) - Body ground Always 10 kΩ or higher
      for Rear RH:
      Tester Connection Condition Specified Condition
      A64-17 (RR+) - M20-1 (RR+) Always Below 1 Ω
      A64-17 (RR+) or M20-1 (RR+) - Body ground Always 10 kΩ or higher
      A64-16 (RR-) - M20-2 (RR-) Always Below 1 Ω
      A64-16 (RR-) or M20-2 (RR-) - Body ground Always 10 kΩ or higher
      for Rear LH:
      Tester Connection Condition Specified Condition
      A64-5 (RL+) - N11-1 (RL+) Always Below 1 Ω
      A64-5 (RL+) or N11-1 (RL+) - Body ground Always 10 kΩ or higher
      A64-4 (RL-) - N11-2 (RL-) Always Below 1 Ω
      A64-4 (RL-) or N11-2 (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.

      w/o VSC: Click here

      w/ VSC: 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
      Proceed to
      DTC is output (w/o VSC)
      DTC is output (w/ VSC)
      DTC is not output

    DTC is output (w/o VSC)

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    DTC is output (w/ VSC)

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    DTC is not output

    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 axle hub sub-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.

      w/o VSC: Click here

      w/ VSC: Click here

      Tech Tips


      • If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-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.

      w/o VSC: Click here

      w/ VSC: Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. RECONFIRM DTC


    1. Clear the DTC.

      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
      Proceed to
      DTC is output
      DTC is not output

      Tech Tips

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


    DTC is not output

    END

    DTC is output

  9. REPLACE BRAKE ACTUATOR ASSEMBLY


    1. Replace the brake actuator assembly.

      w/o VSC: Click here

      w/ VSC: Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. RECONFIRM DTC


    1. Clear the DTC.

      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
      Proceed to
      DTC is output
      DTC is not output

    DTC is output

    REPLACE 4WD ECU ASSEMBLY Click here

    DTC is not output

    END