PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A46

DTC Code DTC Name
C1A46 Yaw Rate Sensor

DESCRIPTION

The brake booster with master cylinder assembly (skid control ECU) receives vehicle stability control system signals from the airbag sensor assembly (yaw rate sensor) and sends the signals to the driving support ECU assembly and power management control ECU. If the brake booster with master cylinder assembly (skid control ECU) detects that the airbag sensor assembly (yaw rate sensor) is malfunctioning, the brake booster with master cylinder assembly (skid control ECU) sends a malfunction signal to the driving support ECU assembly, and the driving support ECU assembly stores DTC C1A46. Also, when DTC C1A46 is stored, the brake booster with master cylinder assembly (skid control ECU) stores DTC C1234 at the same time.

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

  • CAN communication system

  • Airbag sensor assembly (yaw rate sensor)

  • Brake booster with master cylinder assembly (skid control ECU)

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Tech Tips

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

PROCEDURE


  1. CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check for electronically controlled brake system DTCs Click here.

      OK
      electronically controlled brake system DTCs are not output.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

  2. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU)


    1. Replace the brake booster with master cylinder assembly (skid control ECU) (See page for LHD, Click here for RHD).


    NEXT

  3. CHECK DTC OUTPUT (PRE-CRASH SAFETY 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: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

    6. Drive the vehicle at a speed of 5 km/h (3 mph) or more.

    7. Recheck for DTCs.

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

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    C

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here