Home

Toyota Workshop

GSIC - Global Service Information Center

DTC    C1A46    Yaw Rate Sensor

for Preparation Click here


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 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, and the driving support ECU 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
When the vehicle speed is 5 km/h (3 mph) or more, a yaw rate sensor malfunction signal is received from the brake booster with master cylinder (skid control ECU).
  1. Yaw rate sensor
  2. Brake booster with master cylinder (skid control ECU)
  3. CAN communication system
  4. Power management control ECU
  5. Driving support ECU

INSPECTION PROCEDURE

HINT:
This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection (Click here).

1.CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

  1. Check DTCs for the electronically controlled brake system (Click here).

    OK:
    Electronically controlled brake system DTC is not output.



NG
GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (Click here)
OK


2.REPLACE BRAKE BOOSTER WITH MASTER CYLINDER

  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. Using the intelligent tester, enter the following menus: Body / Pre-Crash 2 / DTC.

  1. Clear the DTCs (Click here).

  1. Driver the vehicle.

  1. Recheck for DTCs.

    OK:
    DTC C1A46 is not output.



NG
REPLACE DRIVING SUPPORT ECU (Click here)
OK

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (Click here)