DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A40

DTC Code DTC Name
C1A40 ENG / EHV Device

DESCRIPTION

When the driving support ECU receives an SFI system or Automatic transmission system malfunction signal from the ECM, this DTC is stored.

When DTC C1A40 is stored, the engine control system or Automatic transmission system DTC will also be stored.

DTC Code DTC Detection Condition Trouble Area
C1A40 While the engine switch is on (IG), an SFI system malfunction signal is detected for 1 second or more.

  • SFI system

  • Automatic transmission system

  • ECM

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (SFI SYSTEM)


    1. Clear the DTCs.

      for 2GR-FSE: Click here

      for 4GR-FSE: Click here

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash system:

        The engine switch is on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs.

      for 2GR-FSE: Click here

      for 4GR-FSE: Click here

      OK
      SFI system DTCs are not output.
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FSE) B
      NG (for 4GR-FSE) C

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    A

  2. CHECK FOR DTC (AUTOMATIC TRANSMISSION SYSTEM)


    1. Clear the DTCs.

      for A760H: Click here

      for A760E: Click here

      for A960E: Click here

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash system:

        The engine switch is on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs.

      for A760H: Click here

      for A760E: Click here

      for A960E: Click here

      OK
      Automatic transmission system DTCs are not output.
      Result
      Result Proceed to
      OK A
      NG (for A760H) B
      NG (for A760E) C
      NG (for A960E) D

    B

    GO TO AUTOMATIC TRANSMISSION SYSTEM Click here

    C

    GO TO AUTOMATIC TRANSMISSION SYSTEM Click here

    D

    GO TO AUTOMATIC TRANSMISSION SYSTEM Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash system:

        The engine switch is on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.

    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU with a new one Click here.

      Note

      When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash system:

        The engine switch is on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FSE) B
      NG (for 4GR-FSE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (DRIVING SUPPORT ECU IS DEFECTIVE)