PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A46

DTC Code DTC Name
C1A46 Yaw Rate Sensor

DESCRIPTION

The brake booster with master cylinder (skid control ECU) receives vehicle stability signals from the 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 (skid control ECU) detects that the yaw rate sensor is malfunctioning, the brake booster with master cylinder (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 (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 and approximately 10 seconds or more elapse after power switch is on (IG), a yaw rate sensor malfunction signal is received from the brake booster with master cylinder (skid control ECU).

  • CAN communication system

  • Yaw rate sensor

  • Brake booster with master cylinder (skid control ECU)

  • Driving support ECU assembly

INSPECTION PROCEDURE

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 DTCs for the electronically controlled brake system Click here.

      OK
      DTC C1234 is not output.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

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


    1. Replace the brake booster with master cylinder (skid control ECU) Click here (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 with the vehicle speed is 5 km/h (3 mph) or more.

    7. Recheck for DTCs.

      OK
      DTC C1A46 is not output.

    NG

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    OK

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