DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A40

DTC Code DTC Name
C1A40 ENG / EHV Device

DESCRIPTION

When the driving support ECU assembly receives a hybrid control system or SFI system malfunction signal from the power management control ECU or ECM via CAN communication, DTC C1A40 is stored.

DTC No. DTC Detection Condition Trouble Area
C1A40 When the power switch is on (IG), a hybrid control system or EFI system malfunction signal is detected for 3 seconds or more.

  • Hybrid control system

  • Power management control ECU

  • SFI system

  • ECM

  • Driving support ECU assembly

WIRING DIAGRAM

A01I5HTE18

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.

  • If the ECM or power management control ECU is replaced, refer to Registration Click here.

PROCEDURE


  1. CHECK FOR DTCs (HYBRID CONTROL SYSTEM)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    5. Check for DTCs.

      Result
      Result Proceed to
      Hybrid control system DTC is not output A
      Hybrid control system DTC C1A40 is output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  2. CHECK FOR DTCs (SFI SYSTEM)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Check for DTCs.

      Result
      Result Proceed to
      SFI system DTC is not output A
      SFI system DTC is output B

    B

    GO TO SFI SYSTEM Click here

    A

  3. REPLACE POWER MANAGEMENT CONTROL ECU


    1. Replace the power management control ECU Click here.


    NEXT

  4. CHECK FOR DTCs (DTC C1A40)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed using the cruise control system.

    6. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    7. Check for DTCs.

      Result
      Result Proceed to
      DTC C1A40 is not output A
      DTC C1A40 is output B

    B

    REPLACE ECM Click here

    A

    END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  6. CHECK FOR DTCs (DTC C1A40)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed using the cruise control system.

    6. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    7. Check for DTCs.

      Result
      Result Proceed to
      DTC C1A40 is not output A
      DTC C1A40 is output B

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    A

    END (ECM WAS DEFECTIVE)