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 receives brake control request signals from the ECM and driving support ECU.

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

If the driving support ECU receives a malfunction signal, DTC C1A41 is output. Although the skid control ECU sends a malfunction signal to the driving support ECU, the ABS does not output a relevant malfunction detection DTC.

DTC Code DTC Detection Condition Trouble Area
C1A41 While the engine switch is on (IG), the brake actuator (skid control ECU) detects a significant difference in the brake request signal from the ECM and driving support ECU for 3 seconds or more.

  • Vehicle stability control system

  • SFI system

  • ECM

  • Brake actuator assembly (skid control ECU)

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      Vehicle stability control system DTCs is not output.

    NG

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    OK

  2. CHECK FOR DTC (SFI SYSTEM)


    1. Clear the DTCs.

      for 2GR-FSE: Click here

      for 4GR-FSE: Click here

    2. Check for DTCs.

      for 2GR-FSE: Click here

      for 4GR-FSE: Click here

      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 4GR-FSE) C

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    A

  3. REPLACE ECM


    1. Replace the ECM with a new one.

      for 2GR-FSE: Click here

      for 4GR-FSE: Click here


    NEXT

  4. CHECK FOR DTC (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1A41 is not output.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END (ECM WAS DEFECTIVE)

  5. REPLACE BRAKE ACTUATOR ASSEMBLY


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


    NEXT

  6. CHECK FOR DTC (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1A41 is not output.

      Note

      When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.


    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    END (BRAKE ACTUATOR ASSEMBLY WAS DEFECTIVE)