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PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A50

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DTC Code DTC Name
C1A50 Brake System Malfunction
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DESCRIPTION

When the pre-crash safety system is operating, the driving support ECU assembly sends brake control signals to the brake booster with master cylinder assembly (skid control ECU).

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

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

  • Electronically controlled brake system

  • Brake booster with master cylinder assembly (skid control ECU)

  • Driving support ECU assembly
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CAUTION / NOTICE / HINT

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.

  • 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).

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (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 electronically controlled brake system DTCs (Click here).

      Table 1. Result
      Result Proceed to
      Electronically controlled brake system DTCs are not output A
      Electronically controlled brake system DTCs are output B

  2. Click here

    CHECK DTC OUTPUT (PRE-CRASH SAFETY 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: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs (Click here).

    6. Make sure that the DTC detection conditions are met.

      Tip:

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

    7. Check for DTCs (Click here).

      Table 2. Result
      Result Proceed to
      DTC C1A50 is output A
      DTC C1A50 is not output B

  3. Click here

    REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly (Click here).


  4. Click here

    CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Make sure that the DTC detection conditions are met.

      Tip:

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

    5. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    6. Check for DTCs (Click here).

      Table 3. Result
      Result Proceed to
      DTC C1A50 is not output A
      DTC C1A50 is output (for LHD) B
      DTC C1A50 is output (for RHD) C

    • A

      END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    • B

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

    • C

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