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), the vehicle speed is 5 km/h or more and a malfunction signal from the power steering ECU assembly is detected by the forward recognition camera for 75 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 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.

    Click here

PROCEDURE


  1. CHECK DTC OUTPUT (POWER STEERING SYSTEM)


    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.

      Click here


      Chassis > EMPS > Trouble Codes
      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 DTC OUTPUT


    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


      Chassis > LKA/LDA > Clear DTCs

    6. Make sure the following 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 77 seconds or more.

      2. Drive the vehicle at 5 km/h (3 mph) or more.

    7. Check for DTCs.

      Click here


      Chassis > LKA/LDA > Trouble Codes
      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. Adjust the forward recognition camera.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK DTC OUTPUT


    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


      Chassis > LKA/LDA > Clear DTCs

    6. Make sure the following 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 77 seconds or more.

      2. Drive the vehicle at 5 km/h (3 mph) or more.

    7. Check for DTCs.

      Click here


      Chassis > LKA/LDA > Trouble Codes
      Result
      Result Proceed to
      DTC C1A71 is not output. A
      DTC C1A71 is output. (for LHD) B
      DTC C1A71 is output. (for RHD) C

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here