FOUR WHEEL DRIVE CONTROL SYSTEM, Diagnostic DTC:C1299/99

DTC Code DTC Name
C1299/99 Cancellation of 4WD Control

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
C1299/99

  • When both of the following are detected:


    • The torque-distribution ratio of the differential clutch exceeds the set value.

    • The vehicle is driven with tires different in size between the front and rear.

  • Tire size

  • Brake control system

  • Suspension or drivetrain-related parts

  • 4WD ECU assembly

  • Automatic with transfer transmission assembly

INSPECTION PROCEDURE

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.

    NG

    REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE

    OK

  2. CHECK DTC


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that no brake control system DTCs are output Click here.

      Result
      Result Proceed to
      Brake control system DTC is not output A
      Brake control system DTC is output B

    B

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

    A

  3. READ VALUE USING GTS (WHEEL SPEED)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Enter the following menus: Chassis / Four Wheel Drive / Data List Click here.

    4. Check that the speed values detected at all four wheels displayed on the GTS are the same when driving the vehicle.

      Four Wheel Drive
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed.
      FL Wheel Speed Front wheel speed sensor LH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed.
      RR Wheel Speed Rear wheel speed sensor RH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed.
      RL Wheel Speed Rear wheel speed sensor LH reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed.
      OK
      The same vehicle speed detected at all four wheels must be indicated on the GTS.

    NG

    GO TO BRAKE CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  4. CHECK RELATED PART


    1. Inspect the suspension and ball joint, etc. for rattle.

    2. Inspect the driveshaft and propeller shaft rotation condition.


    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS

    OK

  5. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the engine switch off.

    3. Start the engine.

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

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    CHECK INTERMITTENT PROBLEMS Click here

    A

  6. REPLACE 4WD ECU ASSEMBLY


    1. Replace the 4WD ECU assembly Click here.


    NEXT

  7. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the engine switch off.

    3. Start the engine.

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

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    CHECK INTERMITTENT PROBLEMS Click here

    A

    REPLACE AUTOMATIC WITH TRANSFER TRANSMISSION ASSEMBLY Click here