DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A50

DTC Code DTC Name
C1A50 Brake System

DESCRIPTION

When the driving support ECU assembly receives an electronically controlled brake system malfunction signal from the skid control ECU (brake booster with master cylinder assembly) via CAN communication, DTC C1A50 is stored.

DTC No. DTC Detection Condition Trouble Area
C1A50 When the power switch is on (IG), the driving support ECU assembly detects a malfunction in the signal received from the skid control ECU (brake booster with master cylinder assembly) for 0.2 seconds or more.

  • Electronically controlled brake system

  • Driving support ECU assembly

WIRING DIAGRAM

A01I5HTE19

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 (DTC C1A50)


    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 C1A50 is not output A
      DTC C1A50 is output B

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly Click here.


    NEXT

  4. CHECK FOR DTCs (DTC C1A50)


    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 C1A50 is not output A
      DTC C1A50 is output B

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

  5. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER


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


    NEXT

  6. CHECK FOR DTCs (DTC C1A50)


    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 C1A50 is not output A
      DTC C1A50 is output B

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

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