PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A41

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

DESCRIPTION

The skid control ECU assembly receives brake control request signals from the power management control ECU and driving support ECU assembly.

When the request signals received from the power management control ECU and driving support ECU assembly are not consistent, the skid control ECU assembly 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 output. Although the skid control ECU assembly sends a malfunction signal to the driving support ECU assembly, the electronically controlled brake system does not output a relevant malfunction detection DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A41 Brake Request Value Mismatch between ENG / EHV and Driving Support ECU While the power switch is on (IG), the skid control ECU assembly detects a significant difference in the brake request signal from the power management control ECU and driving support ECU assembly for 3 seconds or more.

  • Electronically controlled brake system

  • Hybrid control system

  • Power management control ECU

  • Skid control ECU assembly

  • Driving support ECU assembly

PROCEDURE


  1. CHECK FOR DTCs (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Trouble Codes.

    5. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      Electronically controlled brake system DTCs are not output A
      Electronically controlled brake system DTCs are output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CHECK FOR DTCs (HYBRID CONTROL SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Check for DTCs.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      Hybrid control system DTCs are not output A
      Hybrid control system DTCs are output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. REPLACE POWER MANAGEMENT CONTROL ECU


    1. Replace the power management control ECU with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (PRE-CRASH 2)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Crash 2 > 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


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A41 is output A
      DTC C1A41 is not output B

    B

    END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)

    A

  5. REPLACE SKID CONTROL ECU ASSEMBLY


    1. Replace the skid control ECU assembly with a new one.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (PRE-CRASH 2)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Crash 2 > 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


      Body Electrical > Pre-Crash 2 > 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 (SKID CONTROL ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here