DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A52

DTC Code DTC Name
C1A52 Driving Support ECU Communication Abnormal

DESCRIPTION

DTC C1A52 is stored when the ECM cannot recognize the driving support ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A52 Driving Support ECU Communication Abnormal Approximately 17 seconds after the ignition switch is turned to ON, the ECM cannot recognize the driving support ECU assembly for approximately 1.3 seconds or more.

  • ECM

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


  • Before replacing the ECM, refer to Service Bulletin.

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

  • 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 FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs.

      Click here

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

      Tech Tips

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

    5. Enter the following menus: Powertrain / Radar Cruise2 / Trouble Codes.

    6. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1A52 is output A
      DTC C1A52 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. REPLACE ECM


    1. Replace the ECM

      for 1GR-FE: Click here

      for 1KD-FTV: Click here

      for 1GD-FTV: Click here

      for 2TR-FE: Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs.

      Click here

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

      Tech Tips

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

    5. Enter the following menus: Powertrain / Radar Cruise2 / Trouble Codes.

    6. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1A52 is output A
      DTC C1A52 is not output B

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    B

    END (ECM WAS DEFECTIVE)