PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A46

DTC Code DTC Name
C1A46 Yaw Rate Sensor

DESCRIPTION

The driving support ECU assembly receives yaw rate sensor 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 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 malfunction signal from yaw rate sensor 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 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-crash safety 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-crash safety 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.


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

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Drive the vehicle at a speed of 5 km/h (4 mph) or more for 10 seconds or more.

    2. Check for DTCs.

      Click here


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      C1A46 is not output A
      C1A46 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  4. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Drive the vehicle at a speed of 5 km/h (4 mph) or more for 10 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      C1A46 is not output A
      C1A46 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

  7. REPLACE YAW RATE SENSOR (AIRBAG ECU ASSEMBLY)


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

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Drive the vehicle at a speed of 5 km/h (4 mph) or more for 10 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      C1A46 is not output A
      C1A46 is output B

    A

    END (YAW RATE SENSOR WAS DEFECTIVE)

    B

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