When the vehicle is turning with respect to a vertical axis, the yaw rate sensor detects the yaw rate electroniclly by the vibration change of plate fork inside the yaw rate sensor.
If yaw velocity reaches the specific velocity after it detects the vehicle' yawing, the ESP control is reactivated.
The lateral G sensor senses vehicle's lateral G. A small element inside the sensor is attached to a deflectable leverarm by lateral G.
Direction and magnitude of lateral G loaded to vehicle can be known with electrostatic capacity changing according to lateral G.
If the difference between estimated value and measured value of the sensor is larger than predefined value for predefined time, the failure is recognized.
Item
Detecting Condition
Possible cause
DTC Strategy
Signal monitoring
Faulty Yaw Rate & Lateral G sensor
Case1
Enable
Conditions
When the difference between estimated value and measured value of the yaw rate sensor is lager than Predefined value for specific time , ECU detects failure.
Case2
When the difference between estimated value and measured value of the lateral G sensor is lager than Predefined value for specific time , ECU detects failure.
Case3
Yaw signal is smaller than predefined value when CBIT is transmitted
Lateral G signal is smaller than defined value when CBIT is transmitted.
? CBIT : Commanded Built In Test
Case4
In case that Yaw&LG Sensor Fail Flag is detected for defined time
Fail Safe
Inhibit the ESP control and allow the ABS/EBD control.
The ESP warning lamp is activated.