Lexus ES: Malfunction in Yaw Rate Sensor (C1436)
DESCRIPTION
The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).
When the skid control ECU (brake booster with master cylinder assembly) detects improper installation of the yaw rate and acceleration sensor (airbag ECU assembly) or an abnormality in the difference between the yaw rate sensor value and the control value estimated based on the acceleration sensor, steering angle sensor and speed sensor signals, DTC C1436 is stored.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|---|
| C1436 | Malfunction in Yaw Rate Sensor | 713 714 | Either of the following is detected:
|
| Does not come on | VSC DTC |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | The vehicle is stopped. | ○ | - |
| Malfunction Status | The yaw rate and acceleration sensor output value is not 0 deg/s. | ○ | - |
| Abnormal comparison value. | - | ○ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (YAW RATE SENSOR) |
(a) Select the Data List on the Techstream.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Yaw Rate Sensor | Yaw rate sensor 1 | Min.: -128 degrees/s, Max.: 127 degrees/s | Vehicle stationary: 0 degrees/s Turning right: -128 to 0 degrees/s Turning left: 0 to 127 degrees/s | - |
| Yaw Rate Sensor2 | Yaw rate sensor 2 | Min.: -128 degrees/s, Max.: 127 degrees/s | Vehicle stationary: 0 degrees/s Turning right: -128 to 0 degrees/s Turning left: 0 to 127 degrees/s | - |
| Tester Display |
|---|
| Yaw Rate Sensor |
| Yaw Rate Sensor2 |
(b) Check the yaw rate sensor output value displayed on the Techstream.
| Result | Proceed to |
|---|---|
| NG (The yaw rate sensor (airbag ECU assembly) output value is 0 deg/s when the vehicle is stationary, but the value fluctuates when turning.) | A |
| NG (The yaw rate sensor (airbag ECU assembly) output value is not 0 deg/s when the vehicle is stationary.) | B |
| OK | C |
| B | .gif) | REPLACE AIRBAG ECU ASSEMBLY |
| C | | USE SIMULATION METHOD TO CHECK |
|
| 2. | CHECK AIRBAG ECU ASSEMBLY INSTALLATION |
(a) Turn the power switch off.
(b) 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 tilted.
| OK | | REPLACE AIRBAG ECU ASSEMBLY |
| NG | | INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
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