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DYNAMIC RADAR CRUISE CONTROL SYSTEM(except 2AR-FE), Diagnostic DTC:C1A11, C1A14

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

When it is determined that the vehicle is being driven in a straight line or on a gradual curve based on signals from the yaw rate and acceleration sensor, the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis has deviated. When the millimeter wave radar sensor assembly beam axis is misaligned, the millimeter wave radar sensor assembly stores DTC C1A11.

After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A11 Front Radar Sensor Incorrect Axial Gap When the vehicle is being driven at a speed of 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.3 seconds or more. Millimeter wave radar sensor assembly
C1A14 Front Radar Sensor Beam Axis Not Adjusted When the vehicle is being driven at a speed of 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, incompletion of the millimeter wave radar sensor assembly beam axis alignment is detected for approximately 0.3 seconds or more. Millimeter wave radar sensor assembly
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CAUTION / NOTICE / HINT

Note:

  • When replacing the millimeter wave radar sensor assembly, make sure to replace it with a new one. If a device 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, and as a result, a DTC may be stored.

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

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  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

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  • If only history DTCs are stored, they may have been stored due to a temporary condition such as overloading of the vehicle.

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PROCEDURE


  1. Click here

    CHECK FOR DTCs

    Tip:

    If only history DTCs are stored, they may have been stored due to a temporary condition such as overloading of the vehicle.


    1. Check if the stored DTCs are current DTCs.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Enter the following menus: Body Electrical / Radar Cruise 2 / Trouble Codes.

    5. Check for DTCs.


      1. Powertrain > Radar Cruise2 > Trouble Codes


      Result
      Result Proceed to
      Current DTC C1A11 is output A
      Current DTC C1A14 is output B
      History DTC C1A11 is output C

  2. Click here

    CHECK VEHICLE CONDITION


    1. Check the operating conditions of the vehicle.

      Tip:

      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 being towed A
      Vehicle is overloaded or being towed B

  3. Click here

    CHECK WHEEL ALIGNMENT


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

      for front wheel alignment:Click here

      for rear wheel alignment:Click here

      Tip:

      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

  4. Click here

    ADJUST WHEEL ALIGNMENT


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

      for front wheel alignment:Click here

      for rear wheel alignment:Click here

      Result
      Proceed to
      NEXT

  5. Click here

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

  6. Click here

    CHECK FOR DTCs


    1. Clear the DTCs.


      1. Powertrain > Radar Cruise2 > Clear DTCs


    2. Perform the following procedure.

      Tip:

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


      1. Turn the ignition switch to ON.

      2. Turn the dynamic radar cruise control system on using the cruise control main switch.

      3. Drive the vehicle at 5 km/h (3 mph) or more for 1 second or more.

    3. Check for DTCs.


      1. Powertrain > Radar Cruise2 > 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 DEFECTIVE)

    • B

      REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

  7. Click here

    CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY


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

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      Tip:

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

      Result
      Result Proceed to
      Bracket is not deformed A
      Bracket is deformed B

  8. Click here

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Replace the millimeter wave radar sensor assembly.

      Click here

    2. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

  9. Click here

    CLEAR DTCs


    1. Clear the DTCs.


      1. Powertrain > Radar Cruise2 > Clear DTCs


      Result
      Proceed to
      NEXT

    • NEXT

      END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

  10. Click here

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Return the vehicle to normal operating conditions.

    2. Perform millimeter wave radar sensor assembly adjustment.

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    3. Clear the DTCs.


      1. Powertrain > Radar Cruise2 > Clear DTCs


      Result
      Proceed to
      NEXT

    • NEXT

      END

  11. Click here

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    1. Perform millimeter wave radar sensor assembly adjustment.

      Click here

      Result
      Proceed to
      NEXT

  12. Click here

    CHECK FOR DTCs


    1. Clear the DTCs.


      1. Powertrain > Radar Cruise2 > Clear DTCs


    2. Perform the following procedure.

      Tip:

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


      1. Turn the ignition switch to ON.

      2. Turn the dynamic radar cruise control system on using the cruise control main switch.

      3. Drive the vehicle at 5 km/h (3 mph) or more for 1 second or more.

    3. Check for DTCs.


      1. Powertrain > Radar Cruise2 > Trouble Codes


      Result
      Result Proceed to
      DTC C1A14 is not output A
      DTC C1A14 is output B

    • A

      END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

    • B

      REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLYClick here

  13. Click here

    CLEAR DTC


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

    2. Clear the DTCs.


      1. Powertrain > Radar Cruise2 > Clear DTCs


      Result
      Proceed to
      NEXT

    • NEXT

      END