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 brake booster with master cylinder (skid control ECU) 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 brake booster with master cylinder (skid control ECU) 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 While power switch is on (IG), brake request signal from power management control ECU and driving support ECU assembly are inconsistent for 1 second

  • Electronically controlled brake system

  • Hybrid control system

  • Power management control ECU

  • Brake booster with master cylinder (skid control ECU)

  • Driving support ECU assembly

WIRING DIAGRAM

Refer to DTC C1A50 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/TRAC / Trouble Codes.

    5. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC is 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.

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

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. CHECK FOR DTCs (DTC C1A41)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. 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 of between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

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

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

    6. Check for DTCs.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  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 GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. 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 of between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

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

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

    6. Check for DTCs.

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

    A

    END

    B

  6. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER


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

    2. Replace the brake booster with master cylinder (skid control ECU) (for RHD) Click here.


    NEXT

  7. CHECK FOR DTCs (DTC C1A41)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. 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 of between approximately 50 km/h (30 mph) and 170 km/h (105 mph).

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

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

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

    6. Check for DTCs.

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

    A

    END

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here