DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A41

DTC Code DTC Name
C1A41 Brake Request Value Mismatch between ENG / EHV and Driving Support ECU

DESCRIPTION

The brake actuator assembly (skid control ECU) receives brake control request signals from the ECM and driving support ECU assembly.

When the request signals received from the ECM and driving support ECU assembly are not consistent, the brake actuator assembly (skid control ECU) determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU assembly.

If the driving support ECU assembly receives a malfunction signal, DTC C1A41 is stored. Although the brake actuator assembly (skid control ECU) sends a malfunction signal to the driving support ECU assembly, the vehicle stability control system does not store a relevant DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A41 Brake Request Value Mismatch between ENG / EHV and Driving Support ECU When the cruise control switch is on and the vehicle is being driven at a speed of 36 km/h (22 mph) or more, the brake actuator assembly (skid control ECU) detects a significant difference in the brake request signals from the ECM and driving support ECU assembly for 1 second or more.

  • Vehicle stability control system

  • SFI system

  • ECM

  • Brake actuator assembly (skid control ECU)

  • Driving support ECU assembly

PROCEDURE


  1. CHECK FOR DTCs (VEHICLE STABILITY CONTROL 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: Chassis / ABS/VSC/TRAC / Trouble Codes.

    5. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      Vehicle stability control system DTCs are not output A
      Vehicle stability control system DTCs are output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  2. 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. for 2GR-FSE:

      Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes

    6. for 8AR-FTS:

      Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      SFI system DTCs are not output A
      SFI system DTCs are output (for 2GR-FSE) B
      SFI system DTCs are output (for 8AR-FTS) C

    B

    GO TO SFI SYSTEM w/ Canister Pump Module: Click here
    GO TO SFI SYSTEM w/o Canister Pump Module: Click here

    C

    GO TO SFI SYSTEM w/ Canister Pump Module: Click here
    GO TO SFI SYSTEM w/o Canister Pump Module: Click here

    A

  3. REPLACE ECM


    1. Replace the ECM with a new one.

      for 2GR-FSE: Click here

      for 8AR-FTS: Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (RADAR CRUISE)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC C1A41 is output A
      DTC C1A41 is not output B

    B

    END (ECM WAS DEFECTIVE)

    A

  5. REPLACE BRAKE ACTUATOR ASSEMBLY


    1. Replace the brake actuator assembly with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (RADAR CRUISE)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise > Trouble Codes

      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.

      Result
      Result Proceed to
      DTC C1A41 is not output A
      DTC C1A41 is output B

    A

    END (BRAKE ACTUATOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here