PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A46

DTC Code DTC Name
C1A46 Yaw Rate Sensor

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) receives electronically controlled brake system signals from the airbag ECU assembly (yaw rate sensor) and sends the signals to the driving support ECU assembly. If the skid control ECU (brake booster with master cylinder assembly) detects that the airbag ECU assembly (yaw rate sensor) is malfunctioning, the skid control ECU (brake booster with master cylinder assembly) sends a malfunction signal to the driving support ECU assembly, and the driving support ECU assembly stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A46 Yaw Rate Sensor While the vehicle speed is 5 km/h (3 mph) or more, an airbag ECU assembly (yaw rate sensor) malfunction signal is received from the skid control ECU (brake booster with master cylinder assembly) for 12.632 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.

PROCEDURE


  1. CHECK FOR DTCs (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 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. REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)


    1. Replace the skid control ECU (brake booster with master cylinder assembly) with a new one.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCs (PRE-CRASH 2)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Crash 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-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A46 is not output A
      DTC C1A46 is output (for LHD) B
      DTC C1A46 is output (for RHD) C

    A

    END (SKID CONTROL ECU [BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY] WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    C

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here