General Information

Component Location





General Description

The sensor cluster installed at floor under center console is composed of yaw rate sensor, lateral G sensor, microcontroller in a aluminum container.
When the vehicle is turning with respect to a vertical axis the yaw rate sensor detects the yaw rate electronically by the vibration change of plate fork inside the yaw rate sensor. If yaw velocity reaches the specific velocity (4deg/s) after it detects the vehicle' yawing, the ESC control is reactivated.
The yaw rate sensor outputs 0V in case of a trouble.
Sensor cluster has a self diagnosis function, this information is outputted as yaw rate & lateral G signal to HECU through separate CAN.
The later G sensor senses vehicle's lateral G.
A small element inside the sensor is attached to a deflectable leverarm by later G. Direction and magnitude of lateral G loaded to vehicle can be known with electrostatic capacity changing according to lateral G.
The output voltage of the lateral G sensor is 2.5V when the vehicle is at a standstill. Only with lateral G sensor, the ESC can not be reactivated.

DTC Description

The measured lateral acceleration is monitored if the vehicle is standing still and The lateral acceleration sensor signal offset is calculated and monitored by using a long time adjustment procedure. A lateral acceleration reference signal is calculated from the wheel speeds, the steering angle and the yaw rate signals to observe the lateral acceleration sensor signal. The difference between the reference signal and the sensor signal is evaluated for failure detection. The measured yaw rate sensor signal is monitored when the vehicle is standing still and the topical sensor signal value is latched once per loop if the signal is constant. A yaw rate reference signal is calculated from the wheel speeds, the steering angle and the lateral acceleration signals to observe the yaw rate sensor signal. The difference between the reference signal and the sensor signal, and the gradient of the measured sensor signal is evaluated for the failure detection. A DTC is set if one or more sensor signal among the above sensor signals is out of specified range.

DTC Detecting Condition









Schematic Diagram