DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A40

DTC Code DTC Name
C1A40 ENG / EHV Device

DESCRIPTION

When the driving support ECU assembly detects a signal indicating a malfunction in the SFI system or automatic transmission system from the ECM, this DTC is stored.

When DTC C1A40 is stored, the SFI system or automatic transmission system DTC will also be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A40 ENG / EHV Device While the engine switch is on (IG), a signal from the ECM indicating a malfunction in the SFI system or automatic transmission system is detected for 1.3 seconds or more.

  • SFI system

  • Automatic transmission system

  • ECM

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

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.

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (SFI SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Check for DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      SFI system DTCs are not output A
      SFI system DTCs are output B

    B

    GO TO SFI SYSTEM for 2GR-FKS: Click here
    GO TO SFI SYSTEM for 8AR-FTS: Click here

    A

  2. CHECK FOR DTCs (AUTOMATIC TRANSMISSION SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Trouble Codes.

    5. Check for DTCs.


      Powertrain > Transmission > Trouble Codes
      Result
      Result Proceed to
      Automatic transmission system DTCs are not output A
      Automatic transmission system DTCs are output B

    B

    GO TO AUTOMATIC TRANSMISSION SYSTEM for 2GR-FKS: Click here
    GO TO AUTOMATIC TRANSMISSION SYSTEM for 8AR-FTS: Click here

    A

  3. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (RADAR CRUISE)


    1. Clear the DTCs.


      Powertrain > Radar Cruise > Clear DTCs

    2. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the following conditions are not met, the system cannot detect the malfunction.


      1. Turn the engine switch on (IG).

      2. Wait for 2 seconds or more.

    3. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC C1A40 is not output A
      DTC C1A40 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE ECM for 2GR-FKS: Click here
    REPLACE ECM for 8AR-FTS: Click here