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 skid control ECU assembly receives brake control request signals from the hybrid vehicle control ECU assembly and driving support ECU assembly.

When the request signals received from the hybrid vehicle control ECU assembly 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 the malfunction signal, DTC C1A41 is stored.

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 hybrid vehicle control ECU assembly and driving support ECU assembly for 1 second or more.

  • Electronically controlled brake system

  • Hybrid control system

  • Hybrid vehicle control ECU assembly

  • Skid control ECU assembly

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the driving support ECU assembly, make sure to replace it with a new one. If a device 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, and as a result, a DTC may be stored.

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

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 / Engine / Trouble Codes.

    5. Check for DTCs.

      w/o EGR System: Click here

      w/ EGR System: 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 w/o EGR System: Click here
    GO TO HYBRID CONTROL SYSTEM w/ EGR System: Click here

    A

  3. REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY


    1. Replace the hybrid vehicle control ECU assembly with a new one.

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

      Tech Tips

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


      1. Turn the power switch on (IG).

      2. Wait for 1 second or more.

    3. Check for DTCs.

      Click here


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

    A

    END (HYBRID VEHICLE CONTROL ECU ASSEMBLY WAS DEFECTIVE)

    B

  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 (RADAR CRUISE)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > Clear DTCs

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

      Tech Tips

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


      1. Turn the power switch on (IG).

      2. Wait for 1 second or more.

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise > Trouble Codes
      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