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PRE-COLLISION SYSTEM, Diagnostic DTC:C1A46

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DTC Code DTC Name
C1A46 Yaw Rate Sensor
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DESCRIPTION

The driving support ECU assembly receives yaw rate sensor signals from the yaw rate sensor and skid control ECU (brake actuator assembly) via CAN communication. If the driving support ECU assembly receives a yaw rate sensor malfunction signal from the yaw rate sensor or skid control ECU (brake actuator 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 actuator assembly) for approximately 10 seconds.

  • Vehicle stability control system

  • Yaw rate sensor

  • Skid control ECU (Brake actuator assembly)

  • 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.

  • 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.

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PROCEDURE


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    CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

    Tip:

    Pre-collision system DTC C1A46 may be stored due to a malfunction in the vehicle stability control system. Therefore, it is necessary to check for and troubleshoot vehicle stability control system DTCs first.


    1. Check for DTCs.

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      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      Vehicle stability control system DTCs are not output A
      Vehicle stability control system DTCs are output B

  2. Click here

    CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

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      1. Body Electrical > Pre-Collision 2 > Clear DTCs


    2. Perform the following procedure.

      Tip:

      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.

    3. Check for DTCs.

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      1. Body Electrical > Pre-Collision 2 > Trouble Codes


      Result
      Result Proceed to
      DTC C1A46 is not output A
      DTC C1A46 is output B

  3. Click here

    REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly.

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      Result
      Proceed to
      NEXT

  4. Click here

    CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

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      1. Body Electrical > Pre-Collision 2 > Clear DTCs


    2. Perform the following procedure.

      Tip:

      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.

    3. Check for DTCs.

      Click here


      1. 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)

    • BClick here
  5. Click here

    REPLACE YAW RATE SENSOR


    1. Replace the yaw rate sensor.

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      Result
      Proceed to
      NEXT

  6. Click here

    CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      1. Body Electrical > Pre-Collision 2 > Clear DTCs


    2. Perform the following procedure.

      Tip:

      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.

    3. Check for DTCs.

      Click here


      1. 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 WAS DEFECTIVE)

    • B

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)