PRE-COLLISION SYSTEM, Diagnostic DTC:C1A11

DTC Code DTC Name
C1A11 Front Radar Sensor Incorrect Axial Gap

DESCRIPTION

When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor, etc., the millimeter wave radar sensor assembly performs self diagnosis to check if the sensor beam axis has deviated. If the millimeter wave radar sensor assembly beam axis has deviated, the millimeter wave radar sensor assembly detects this and stores DTC C1A11.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A11 Front Radar Sensor Incorrect Axial Gap When the ignition switch is ON, misalignment of the millimeter wave radar sensor assembly is detected for approximately 1 second or more.

  • Millimeter wave radar sensor assembly

  • Wheel alignment

CAUTION / NOTICE / HINT

Note


  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.

    Click here

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check the operating conditions of the vehicle.

      Tech Tips

      DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is temporarily misaligned due to the vehicle being overloaded.

      Result
      Result Proceed to
      Vehicle is not overloaded or has been towed A
      Vehicle is overloaded or has been towed B

    B

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    A

  2. CHECK WHEEL ALIGNMENT


    1. Check the front and rear wheel alignment (toe).

      for Front: Click here

      for Rear: Click here

      Tech Tips

      DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is misaligned due to incorrect wheel alignment (toe).

      Result
      Result Proceed to
      Front or rear wheel is misaligned (toe) A
      Front and rear wheels are not misaligned (toe) B

    B

    INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    A

  3. ADJUST WHEEL ALIGNMENT


    1. Adjust the alignment (toe) of the wheels.

      for Front: Click here

      for Rear: Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the ignition switch to ON and wait 1 second or more.

    3. Check for DTCs.


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A11 is not output A
      DTC C1A11 is output B

    A

    END

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

  6. INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Check that the bracket of the millimeter wave radar sensor assembly is not deformed.

      Tech Tips

      If the bracket is deformed, replace the millimeter wave radar sensor assembly.

      OK
      The bracket is not deformed.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 4 Click here

    NG

  7. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly.

      Click here

    2. Adjust the millimeter wave radar sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Pre-Collision 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

    END

  9. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Return the vehicle to normal.

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the ignition switch to ON and wait 1 second or more.

    3. Check for DTCs.


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A11 is not output A
      DTC C1A11 is output B

    A

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS MISALIGNED DUE TO THE VEHICLE BEING OVERLOADED OR TOWED)

    B

  11. CHECK WHEEL ALIGNMENT


    1. Check the front and rear wheel alignment (toe).

      for Front: Click here

      for Rear: Click here

      Tech Tips

      DTC C1A11 may be stored if the millimeter wave radar sensor assembly beam axis is misaligned due to incorrect wheel alignment (toe).

      Result
      Result Proceed to
      Front or rear wheel is misaligned (toe) A
      Front and rear wheels are not misaligned (toe) B

    A

    GO TO STEP 3 Click here

    B

    GO TO STEP 7 Click here