PRE-COLLISION SYSTEM, Diagnostic DTC:C1A46

DTC Code DTC Name
C1A46 Yaw Rate Sensor

DESCRIPTION

The driving support ECU assembly receives yaw rate sensor (airbag ECU assembly) signals from the yaw rate sensor (airbag ECU assembly) and skid control ECU (brake booster with master cylinder assembly) via CAN communication. If the driving support ECU assembly receives a yaw rate sensor (airbag ECU assembly) malfunction signal from the yaw rate sensor (airbag ECU assembly) or skid control ECU (brake booster with master cylinder assembly), DTC C1A46 will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A46 Yaw Rate Sensor

  • While the vehicle is being driven at a speed of 5 km/h (4 mph) or more, the driving support ECU assembly receives a yaw rate sensor (airbag ECU assembly) malfunction signal from yaw rate sensor (airbag ECU assembly) for approximately 10 seconds.

  • While the vehicle is being driven at a speed of 5 km/h (4 mph) or more, the driving support ECU assembly receives a yaw rate sensor (airbag ECU assembly) zero point malfunction signal from skid control ECU (brake booster with master cylinder assembly) for approximately 10 seconds.

  • Electronically controlled brake system

  • Yaw rate sensor (airbag ECU assembly)

  • 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 C1A46 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 C1A46 is not output A
      DTC C1A46 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 C1A46 is not output A
      DTC C1A46 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

  5. REPLACE YAW RATE SENSOR (AIRBAG ECU ASSEMBLY)


    1. Replace the yaw rate sensor (airbag ECU assembly).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. 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 C1A46 is not output A
      DTC C1A46 is output B

    A

    END (YAW RATE SENSOR [AIRBAG ECU ASSEMBLY] WAS DEFECTIVE)

    B

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