PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A40

DTC Code DTC Name
C1A40 ENG / EHV Device

DESCRIPTION

When the driving support ECU receives an engine control system or ECT system malfunction signal from the ECM, this DTC is stored.

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

DTC Code DTC Detection Condition Trouble Area
C1A40

  1. System diagnosis conditions


    • Pre-crash system:


      • The engine switch is on (IG).


    • Radar cruise control system:


      • Vehicle is being driven at speed of approximately 50 km/h (31 mph) or more and distance control switch is on

  2. Driving support ECU detects problem with engine control system transmission signal

  • Engine control system

  • ECT system

  • ECM

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (ENGINE CONTROL SYSTEM)


    1. Using the intelligent tester, enter the following menus: Powertrain / Engine /. Then select "Diagnostic Code".

    2. Check for DTCs.

      Result
      Result Proceed to
      Engine control system DTCs is not output A
      Engine control system DTCs is output (for 1UR-FSE) B
      Engine control system DTCs is output (for 1UR-FE) C

    B

    GO TO SFI SYSTEM (for 1UR-FSE) Click here

    C

    GO TO SFI SYSTEM (for 1UR-FE) Click here

    A

  2. CHECK FOR DTC (ECT SYSTEM)


    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
      ECT system DTCs are not output.

    NG

    GO TO AUTOMATIC TRANSMISSION SYSTEM Click here

    OK

  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

    END

  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.

    NG

    REPLACE ECM Click here

    OK

    END

  6. REPLACE ECM


    1. for 1UR-FSE:


      1. Replace the ECM with a new one Click here.

    2. for 1UR-FE:


      1. Replace the ECM with a new one Click here.


    NEXT

  7. 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 TCM Click here

    OK

    END