LKA/LDA SYSTEM, Diagnostic DTC:U023A

DTC Code DTC Name
U023A Lost Communication with Front Camera Module

DESCRIPTION

When a communication error between the forward recognition camera and the power steering ECU assembly is detected, the forward recognition camera notifies other ECUs and stores DTC U023A is stored.

DTC No. DTC Detection Condition Trouble Area
U023A When the power switch is on for 2 seconds or more, a communication malfunction between the forward recognition camera and the power steering ECU assembly is detected for 5 seconds or more

  • CAN communication system

  • Power steering ECU assembly

  • Forward recognition camera

CAUTION / NOTICE / HINT

Note


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

  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera learning Click here.

  • 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.


PROCEDURE


  1. CHECK DTC OUTPUT (POWER STEERING SYSTEM)

    Tech Tips

    When the LKA/LDA system outputs DTC U023A, the power steering system may also output DTC U023A. If DTC U023A is output, perform diagnosis for the power steering system first.


    1. Check for DTCs.


      Result
      Result Proceed to
      Power steering system DTCs are not output A
      Power steering system DTCs are output (for 2AR-FSE) B
      Power steering system DTCs are output (for 2GR-FXE) C

    B

    GO TO POWER STEERING SYSTEM Click here

    C

    GO TO POWER STEERING SYSTEM Click here

    A

  2. CHECK DTC OUTPUT (LKA/LDA SYSTEM)


    1. Clear the DTCs Click here.

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

      Tech Tips

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


      1. Turn the power switch on (IG) and wait 7 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U023A is output A
      DTC U023A is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera Click here.

    2. Adjust the forward recognition camera Click here.


    NEXT

  4. CHECK DTC OUTPUT (LKA/LDA SYSTEM)


    1. Clear the DTCs Click here.

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

      Tech Tips

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


      1. Turn the power switch on (IG) and wait 7 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U023A is output A
      DTC U023A is not output B

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)