DYNAMIC RADAR CRUISE CONTROL SYSTEM(for 2GR-FE, 2AR-FE), 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. DTC Detection Condition Trouble Area
C1A52 Approximately 17 seconds after the engine switch is turned on (IG), 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

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.

PROCEDURE


  1. CHECK FOR DTCs (C1A52)


    1. Clear the DTCs Click here.

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

      Tech Tips

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

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

    4. Check for DTCs.

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

    5. Turn the engine switch off.


    B

    USE SIMULATION METHOD TO CHECK

    A

  2. REPLACE ECM

    (See page for 2GR-FE, Click here for 2AR-FE)


    NEXT

  3. CHECK FOR DTCs (C1A52)


    1. Clear the DTCs Click here.

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

      Tech Tips

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

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

    4. Check for DTCs.

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

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    B

    END (ECM WAS DEFECTIVE)