PRE-COLLISION SYSTEM, Diagnostic DTC:C1A02

DTC Code DTC Name
C1A02 Vehicle Information Not Obtained

DESCRIPTION

When a new driving support ECU assembly is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or 4WD information, etc.) from the main body ECU (multiplex network body ECU) and memorizes the information.

DTC C1A02 is stored when the driving support ECU assembly receives the vehicle specification information from the main body ECU (multiplex network body ECU) but cannot record it.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A02 Vehicle Information Not Obtained Inconsistent vehicle specification information between the main body ECU (multiplex network body ECU) and driving support ECU assembly continues for 13 second or more while the vehicle is being driven at a speed of 50 km/h (31 mph) or more.

  • Driving support ECU assembly

  • Main body ECU (multiplex network body ECU)

INSPECTION PROCEDURE

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. READ VALUE USING TECHSTREAM (COUNTRY# (DSS))


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Data List.

    5. Read the Data List according to the display on the Techstream.

      Pre-Collision 2
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Country# (DSS) Destination country for driving support ECU assembly/JPN, NA, EURO, CA, AUS, SAFC, OTHER, TWN, CHINA, THAI, GCC or NOFIX Actual country code -

      Tech Tips

      The country specification information stored in the driving support ECU assembly is determined by the country specification information stored in the main body ECU (multiplex network body ECU). If the country specification information for the millimeter wave radar sensor assembly matches the vehicle, the country specification information for the main body ECU (multiplex network body ECU) and driving support ECU assembly is incorrect and the main body ECU (multiplex network body ECU) and driving support ECU assembly need to be replaced.

      Result
      Result Proceed to
      Country specification information for vehicle and driving support ECU assembly match A
      Country specification information for vehicle and driving support ECU assembly do not match B

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND DRIVING SUPPORT ECU ASSEMBLY

    A

  2. 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 C1A02 is not output.

    NG

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here