PRE-COLLISION SYSTEM, Diagnostic DTC:C1A52

DTC Code DTC Name
C1A52 Driving Support ECU Communication Abnormal

DESCRIPTION

The 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

 When the engine switch is on (IG), the ECM cannot recognize the driving support ECU assembly for 1.4 seconds or more

  • ECM

  • Driving support ECU assembly

INSPECTION PROCEDURE

Note


  • If the ECM is replaced, refer to Registration Click here

  • 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 DTC (PRE-COLLISION 2)


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    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: Body Electrical / Pre-Collision 2 / Trouble Codes.

    6. Check for DTCs.

      OK
      DTC C1A52 is not output

    NG

    REPLACE ECM Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. REPLACE ECM


    1. Replace the ECM with a new one Click here for 2GR-FE, Click here 2AR-FE).


    NEXT

  3. CHECK FOR DTC (PRE-COLLISION 2)


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    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: Body Electrical / Pre-Collision 2 / Trouble Codes.

    6. Check for DTCs.

      OK
      DTC C1A52 is not output

    NG

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    OK

    END (ECM WAS DEFECTIVE)