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.

When the request signals received from the power management control ECU and driving support ECU are not consistent, the skid control ECU assembly 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 stored.

DTC Code DTC Detection Condition Trouble Area
C1A41 While power switch is on (IG), brake request signal from power management control ECU and driving support ECU are inconsistent for approximately 1 second.

  • Electronically controlled brake system

  • Hybrid control system

  • Skid control ECU assembly

  • Power management control ECU

  • Driving support ECU

INSPECTION PROCEDURE

Note


  • If the power management control ECU is replaced, refer to the Service Bulletin.

  • When replacing the skid control ECU assembly, perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      Electronically controlled brake system DTC is not output.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

  2. CHECK FOR DTC (HYBRID CONTROL SYSTEM)


    1. Clear the DTCs.


    2. Check for DTCs.


      OK
      Hybrid control system DTC is not output.
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FXE) B
      NG (for 2AR-FSE) C

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    C

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. 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 DRIVING SUPPORT ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU with a new one Click here.

      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.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC C1A41 is not output.

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

    OK

    END (DRIVING SUPPORT ECU IS DEFECTIVE)

  6. REPLACE SKID CONTROL ECU ASSEMBLY


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


    NEXT

  7. 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 POWER MANAGEMENT CONTROL ECU Click here

    OK

    END (SKID CONTROL ECU ASSEMBLY IS DEFECTIVE)