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 (airbag ECU assembly) and sends the signals to the driving support ECU assembly and hybrid vehicle control ECU. If the brake booster with master cylinder (skid control ECU) detects that the yaw rate sensor (airbag ECU assembly) 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 (4 mph) or more, a yaw rate sensor (airbag ECU assembly) malfunction signal is received from the brake booster with master cylinder (skid control ECU) for 10 seconds or more.

  • CAN communication system

  • Yaw rate sensor (Airbag ECU assembly)

  • Brake booster with master cylinder (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 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) (See page (for LHD), Click here (for RHD)).


    NEXT

  3. CHECK DTC OUTPUT (PRE-CRASH 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:


      1. Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs Click here.

    6. Drive the vehicle and attempt to reproduce the conditions present when the DTC was detected.

    7. Recheck for DTCs.

      OK
      DTC C1A46 is not output.

    OK

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

    NG

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here