Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Yaw Rate Sensor Signal Compare Failure (C124F62)

DESCRIPTION

for Optitron Meter Type:
  • This DTC is stored when the skid control ECU (brake actuator assembly) detects improper installation of the yaw rate sensor (airbag sensor assembly) or an abnormality in the difference between the yaw rate sensor value and the control value estimated based on the acceleration sensor (airbag sensor assembly), steering angle sensor and speed sensor signals.
for TFT Meter Type:
  • This DTC is stored when the skid control ECU (brake actuator assembly) detects improper installation of the yaw rate sensor (yaw rate and acceleration sensor) or an abnormality in the difference between the yaw rate sensor value and the control value estimated based on the acceleration sensor (yaw rate and acceleration sensor), steering angle sensor and speed sensor signals.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C124F62

Yaw Rate Sensor Signal Compare Failure

A yaw rate sensor comparison malfunction status continues.

  • Yaw rate sensor (airbag sensor assembly) installation (for Optitron Meter Type)
  • Yaw rate sensor (yaw rate and acceleration sensor) installation (for TFT Meter Type)
  • Yaw rate sensor (airbag sensor assembly) (for Optitron Meter Type)
  • Yaw rate sensor (yaw rate and acceleration sensor) (for TFT Meter Type)

CAUTION / NOTICE / HINT

NOTICE:

If the yaw rate and acceleration sensor (airbag sensor assembly) was replaced or reinstalled, perform "Calibration". (for Optitron Meter Type)

If the yaw rate and acceleration sensor was replaced or reinstalled, perform "Calibration". (for TFT Meter Type)

Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (YAW RATE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Yaw Rate Sensor Value

Yaw rate sensor

Min.: -128°/s

Max.: 127°/s

Vehicle stopped: 0°/s

Turning right: -128 to 0°/s

Turning left: 0 to 127°/s

-

Chassis > Brake/EPB > Data List

Tester Display

Yaw Rate Sensor Value

(d) Start the engine.

(e) Perform a road test.

(f) Check the yaw rate sensor output value displayed on the Techstream.

Result

Proceed to

NG (The yaw rate sensor output value is 0°/s when the vehicle is stationary, but the value fluctuates when turning.)

A

NG (The yaw rate sensor output value is not 0°/s when the vehicle is stationary.)

B

OK

C

B

GO TO STEP 5

C

USE SIMULATION METHOD TO CHECK

A

2.

CHECK VEHICLE SPECIFICATION

(a) Check the combination meter assembly.

Click here

Result

Proceed to

for Optitron Meter Type

A

for TFT Meter Type

B

B

GO TO STEP 4

A

3.

CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION

(a) Turn the engine switch off.

(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

Click here

OK:

The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.

OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY

4.

CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION

(a) Turn the engine switch off.

(b) Check that the yaw rate and acceleration sensor has been installed properly.

Click here

OK:

The yaw rate and acceleration sensor is tightened to the specified torque.

The yaw rate and acceleration sensor is not installed in a tilted position.

OK

REPLACE YAW RATE AND ACCELERATION SENSOR

NG

INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY

5.

CHECK VEHICLE SPECIFICATION

(a) Check the combination meter assembly.

Click here

Result

Proceed to

for Optitron Meter Type

A

for TFT Meter Type

B

A

REPLACE AIRBAG SENSOR ASSEMBLY

B

REPLACE YAW RATE AND ACCELERATION SENSOR

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