PRE-COLLISION SYSTEM, Diagnostic DTC:C1A50

DTC Code DTC Name
C1A50 Brake System Malfunction

DESCRIPTION

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

If 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 will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A50 Brake System Malfunction While the power switch is on (IG), the driving support ECU assembly receives an electronically controlled brake system malfunction signal from the skid control ECU (brake booster with master cylinder assembly) for 0.3 seconds or more.

  • Electronically controlled brake system

  • Skid control ECU (brake booster with master cylinder assembly)

  • Driving support ECU assembly

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.

  • The pre-collision system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

    Tech Tips

    Pre-collision system DTC C1A50 may be stored due to a malfunction in the electronically controlled brake system. Therefore, it is necessary to check for and troubleshoot electronically controlled brake system DTCs first.


    1. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      Electronically controlled brake system DTCs are not output A
      Electronically controlled brake system DTCs are output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

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

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A50 is not output A
      DTC C1A50 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

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

      Tech Tips

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

    3. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A50 is not output A
      DTC C1A50 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here for RHD: Click here