Position sensor, suspension

Fig 1: Identifying Suspension Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

There are two position sensors at the rear suspension. The position sensor measure the position of the right and left-hand control arms in relation to the car body. The vertical position of the shock absorber is calculated based on this position. The sensors are supplied with 5 V by the suspension module (SUM). When the vehicle is stationary, the output signal from the sensors is approximately 2-3 V. When there is vertical movement the signal will oscillate around these values; the greater the movement the greater the deviation.

NOTE:

The values move in different directions on the left and right-hand sides. Upwards body movement results in increased voltage on the left-hand side and a voltage drop on the right-hand side.

There are diagnostics for the position sensors, which must be calibrated after replacement.