Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Vehicle Speed
While driving, the brake control module (BCM) (4/16) registers the acceleration and deceleration of the wheels. The 4 wheel sensors (7/31-32 and 7/56-57) (one on each wheel) provide the brake control module (BCM) with information about the rotation speed of each wheel. The brake control module (BCM) calculates the actual speed of the car using this information and puts it out on the controller area network (CAN). The vehicle speed signal is used by the Power Steering Control Module (PSCM) (6/164) so that, when combined with other parameters, it can calculate the optimal desired value for the pump motor speed. The system reduces the speed of the pump motor (=reduced hydraulic pressure) when the vehicle speed increases. The pump motor speed increases (=increased hydraulic pressure) as vehicle speed drops. This to obtain optimal steering assistance in relation to vehicle speed. This is speed dependent power steering.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.