CRUISE CONTROL SYSTEM(for Diesel), Diagnostic DTC:C1A40

DTC Code DTC Name
C1A40 ENG / EHV Device

DESCRIPTION

When the driving support ECU assembly receives a ECD system malfunction signal, DTC C1A40 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A40 While vehicle is being driven at speed of approximately 40 km/h (25 mph) or more and cruise control main switch is on, an ECD system malfunction signal is detected for 1 second or more.

  • ECD system

  • ECM

  • Driving support ECU assembly

PROCEDURE


  1. CHECK FOR DTC (ECD SYSTEM)


    1. Clear 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.


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

    3. Check for DTCs Click here.

      OK
      ECD system DTCs are not output.
      Result
      Result Proceed to
      OK A
      NG (w/ DPF) B
      NG (w/o DPF) C

    B

    GO TO ECD SYSTEM Click here

    C

    GO TO ECD SYSTEM Click here

    A

  2. 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.


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

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. for LHD:


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

    2. for RHD:


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


    NEXT

  4. 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.


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

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.

    OK

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE ECM Click here