The front acceleration sensor records the acceleration of the car body at the front in vertical direction.
The body acceleration is caused by the reaction of the car to the road surface. In addition to the absolute acceleration, the acceleration frequency is also recorded, i.e. the changes in acceleration (spring deflection/rebound), in other terms the vibration frequency of the vehicle body.
The acceleration sensor receives a 12 Volt supply from the control unit.
A voltage value between 0 and 5 Volt is output to the control unit at the signal output of the sensor. A value of 2.5 Volt represents the rest position (acceleration = 0), the values 0 Volt and 5 Volt are the maximum acceleration values.
Important!
In order to check the function of the sensor, "front acceleration sensor" can be selected in the diagnosis program under the point "Function test".
Checking outside the vehicle:
Remove sensor, connect to 12 Volt supply and check the function by measuring the voltage at the signal output while at the same time moving the sensor. If the sensor is operating correctly, the measured voltage value is varied between approx. 0 and 5 Volt (depending on degree of movement, i.e. acceleration magnitude).
Installation location of sensor:Right-hand spring strut dome on side panel behind splash guard.