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 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 determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU.

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 is inconsistent for 1 second

  • Electronically controlled brake system

  • Hybrid control system

  • Power management control ECU

  • Skid control ECU

  • Driving support ECU

WIRING DIAGRAM

Refer to DTC C1A50 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. READ OUTPUT DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Chassis / ABS / VSC / TRC / DTC.

    5. Read the 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. READ OUTPUT DTC (HYBRID CONTROL SYSTEM)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Hybrid Control / DTC.

    5. Read the 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 WHETHER DTC OUTPUT RECURS (DTC C1A41)


    1. Connect the intelligent tester 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 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

      3. Push the -SET switch to activate the cruise control.

    5. Enter the following menus: Powertrain / Radar Cruise / DTC.

    6. Read the DTCs.

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

    B

    REPLACE DRIVING SUPPORT ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  4. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU Click here.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC C1A41)


    1. Connect the intelligent tester 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 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

      3. Push the -SET switch to activate the cruise control.

    5. Enter the following menus: Powertrain / Radar Cruise / DTC.

    6. Read the DTCs.

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

    B

    REPLACE SKID CONTROL ECU Click here

    A

    END

  6. REPLACE SKID CONTROL ECU


    1. Replace the skid control ECU Click here.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC C1A41)


    1. Connect the intelligent tester 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 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch on.

      3. Push the -SET switch to activate the cruise control.

    5. Enter the following menus: Powertrain / Radar Cruise / DTC.

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC C1A41 is output (for LHD) B
      DTC C1A41 is output (for RHD) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

    END