PRE-COLLISION SYSTEM, Diagnostic DTC:C1A11, C1A14

DTC Code DTC Name
C1A11 Front Radar Sensor Incorrect Axial Gap
C1A14 Front Radar Sensor Beam Axis Not Adjusted

DESCRIPTION

When the system determines that the vehicle is driving straight ahead based on signals from the yaw rate and acceleration sensor (airbag sensor assembly), etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis is misaligned.

C1A11 is output when it is determined that the millimeter wave radar sensor assembly beam axis is misaligned.

If sensor beam axis adjustment is not performed after installing a new millimeter wave radar sensor assembly, C1A14 is output.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A11 Front Radar Sensor Incorrect Axial Gap After the ignition switch is turned to ON, misalignment of the millimeter wave radar sensor assembly continues for 0.1 seconds or more Millimeter wave radar sensor assembly
C1A14 Front Radar Sensor Beam Axis Not Adjusted At a vehicle speed of 10 km/h (7 mph) or higher, axis misalignment of the millimeter wave radar sensor assembly was not adjusted for 0.1 seconds or more Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one.

  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Check if the stored DTCs are current DTCs.

    2. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      Current DTC C1A11 is output A
      Current DTC C1A14 is output B
      History DTC C1A11 is output C

    B

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    C

    CLEAR DTC (PRE-COLLISION SYSTEM) Click here

    A

  2. 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

  3. CHECK WHEEL ALIGNMENT


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

      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

  4. ADJUST WHEEL ALIGNMENT


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (PRE-COLLISION SYSTEM)

    Tech Tips

    After performing the radar sensor beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the millimeter wave radar sensor assembly.


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      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

  7. INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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

      Tech Tips

      When 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 5 Click here

    NG

  8. 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

  9. CLEAR DTC (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


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

    NEXT

    END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

  10. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Return the vehicle to normal operating conditions.

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      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

    GO TO STEP 3 Click here

  12. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  13. CHECK FOR DTCs (PRE-COLLISION SYSTEM)

    Tech Tips

    After performing the radar sensor beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the millimeter wave radar sensor assembly.


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A14 is not output A
      DTC C1A14 is output B

    A

    END (SENSOR BEAM AXIS ADJUSTMENT WAS NOT COMPLETED)

    B

    GO TO STEP 8 Click here

  14. CLEAR DTC (PRE-COLLISION SYSTEM)


    1. Check for DTCs related to misalignment of millimeter wave radar sensor assembly.

      Tech Tips

      If only history DTCs are stored, they may have been stored due to a temporarily condition such as overloading of the vehicle, and the system returned to normal when beam axis learning was performed.

    2. Clear the DTCs.

      Click here


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

    NEXT

    END