Shock Absorber

Fig 1: Identifying Shock Absorber

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:

The illustration is of a front shock absorber.

Each wheel has an adjustable shock absorber. The damping force in the shock absorber is altered using a valve in the shock absorber which is affected by the current in the surrounding solenoid.

The suspension module (SUM) controls the current to the solenoid. Lower current gives lower damping forces, high current higher damping forces.

If there is no current to the solenoid, the shock absorber is set to a fail-safe mode, corresponding to conventional passive shock absorbers.

There are diagnostics for the solenoids.