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 (brake booster with master cylinder 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 (brake booster with master cylinder assembly) determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU assembly.

DTC No. DTC Detection Condition Trouble Area
C1A41 When the power switch is on (IG), the skid control ECU (brake booster with master cylinder 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 (brake booster with master cylinder assembly)

  • Driving support ECU assembly

WIRING DIAGRAM

Refer to DTC C1A50 Click here.

INSPECTION PROCEDURE

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.

  • If the power management control ECU is replaced, refer to Registration Click here.

PROCEDURE


  1. CHECK FOR DTCs (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Check for DTCs.

      Result
      Result Proceed to
      Electronically controlled brake system DTC is not output A
      Electronically controlled brake system DTC is output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CHECK FOR DTCs (HYBRID CONTROL SYSTEM)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Check for DTCs.

      Result
      Result Proceed to
      Hybrid control system DTC is not output A
      Hybrid control system DTC is output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. CHECK FOR DTCs (DTC C1A41)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed using the cruise control system.

    6. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    7. Check for DTCs.

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

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  4. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly Click here.


    NEXT

  5. CHECK FOR DTCs (DTC C1A41)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed using the cruise control system.

    6. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    7. Check for DTCs.

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

    B

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) Click here

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

  6. REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)


    1. Replace the skid control ECU (brake booster with master cylinder assembly) Click here.


    NEXT

  7. CHECK FOR DTCs (DTC C1A41)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs Click here.

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

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON-OFF button).

      3. Push the cruise control main switch to -/SET to begin control of vehicle speed using the cruise control system.

    6. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    7. Check for DTCs.

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

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

    END (BRAKE BOOSTER WITH MASTER CYLINDER (SKID CONTROL ECU) WAS DEFECTIVE)