Electric Power Steering

Courtesy of VOLVO CARS CORPORATION

1. Connections to the power steering control module (PSCM)
2. Electric motor with integrated control module
3. Steering gear
4. Tie rod
5. Ball joint
6. Steering column

The power steering system employs the electro principle and is controlled by the Power Steering Control Module (PSCM). This means that there is no hydraulic pump and therefore no hydraulic oil. The control module regulates the power steering assistance based on input signals. This allows it to provide optimal steering assistance, irrespective of whether the vehicle is stationary with the engine running or is being driven at high speed. The functions managed by the Power Steering Control Module (PSCM) are active when the engine is running.

The electric motor with its integrated control module is fitted together on the steering gear.

Together with the electric motor, the steering unit is a replaceable unit.

The Power Steering Control Module (PSCM) is powered by the battery (30 supply) via a fuse in the integrated relay/fusebox in the engine compartment. The Power Steering Control Module (PSCM) receives a 15 supply via the ignition switch and is unfused in the integrated relay/fusebox in the engine compartment and in the central electronic module (CEM). The Power Steering Control Module (PSCM) is grounded to the front side member via a ground lead.

The Power Steering Control Module (PSCM) communicates with other control modules using controller area network (CAN) communication.