Lexus ES: Yaw Rate Sensor Wrong Installation (X0456)
DESCRIPTION
The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition.
| Code | Tester Display | Measurement Item | Trouble Area |
|---|---|---|---|
| X0456 | Yaw Rate Sensor Wrong Installation | History of yaw rate sensor (airbag ECU assembly) being installed incorrectly |
|
PROCEDURE
| 1. | CHECK FOR DTCs (HEALTH CHECK) |
(a) Perform the Health Check using the Techstream.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B |  | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 2. | READ VALUE USING TECHSTREAM (YAW RATE SENSOR VALUE) |
(a) Check Data List item "yaw rate sensor value".
Chassis > Brake > 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 |
| Result | Proceed to |
|---|---|
| NG (The yaw rate and acceleration sensor (airbag ECU assembly) output value is 0°/s when the vehicle is stationary, but the value fluctuates when turning.) | A |
| NG (The yaw rate and acceleration sensor (airbag ECU assembly) output value is not 0°/s when the vehicle is stationary.) | B |
| OK | C |
| B | | REPLACE AIRBAG ECU ASSEMBLY |
| C | | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK AIRBAG ECU ASSEMBLY INSTALLATION |
(a) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.
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OK:
The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.
The yaw rate and acceleration sensor (airbag ECU assembly) is not installed in a tilted position.
| NG | | INSTALL AIRBAG ECU ASSEMBLY |
|
| 4. | CLEAR VEHICLE CONTROL HISTORY |
(a) Using the Techstream, clear the Vehicle Control History.
Chassis > Brake > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
|
| 5. | PERFORM ZERO POINT CALIBRATION OF STEERING ANGLE SENSOR |
(a) Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.
| NEXT | | END |
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