Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Yaw Rate Sensor Signal Compare Failure (C124F62)
DESCRIPTION
- 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.
- 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. |
|
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 | - |
| 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 |
|
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| 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 |
|
| 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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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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