LANE DEPARTURE ALERT SYSTEM(w/ Steering Control), Diagnostic DTC:C1A71

DTC Code DTC Name
C1A71 Power Steering Control Torque

DESCRIPTION

If the power steering ECU assembly detects an abnormality in the steering torque requested by the forward recognition camera, the power steering ECU assembly sends a malfunction signal to the forward recognition camera, and DTC C1A71 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A71 Power Steering Control Torque 2 seconds after the power switch is turned on (IG), a malfunction signal from the power steering ECU assembly is detected by the forward recognition camera for 5 seconds or more.

  • Power steering system

  • Forward recognition camera

  • Power steering ECU assembly

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 adjustment.

    Click here

  • The lane departure alert system (w/ steering control) uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (POWER STEERING SYSTEM)

    Tech Tips

    Lane departure alert system (w/ steering control) DTC C1A71 may be stored due to a malfunction in the power steering system. Therefore it is necessary to check for and troubleshoot power steering system DTCs first.


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / EMPS / Trouble Codes.

    5. Check for DTCs are output.

      Click here

      Result
      Result Proceed to
      Power steering system DTCs are not output A
      Power steering system DTCs are output B

    B

    GO TO POWER STEERING SYSTEM Click here

    A

  2. CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM (w/ Steering Control))


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

    5. Clear the DTCs.

      Click here

    6. Perform the following procedure.

      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.

    7. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1A71 is not output A
      DTC C1A71 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Perform forward recognition camera adjustment.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM (w/ Steering Control))


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

    5. Clear the DTCs.

      Click here

    6. Perform the following procedure.

      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.

    7. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1A71 is not output A
      DTC C1A71 is output B

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here