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.
SPS electrically controlled centering, function - GF46.50-P-2400AA
MODELS 203, 209, 211 with CODE (213a) Speed-sensitive power steering
MODELS 215, 220, 230
Function
The electronic control system of the speed-sensitive power steering is integrated in the traction system control module (N47). A certain manual force (K) is set at the steering wheel according to the speed of the vehicle. As the speed of the vehicle increases, the manual effort (K) required to turn the steering increases at the steering wheel (up to 100 km/h).
The driving speed calculated by the traction system control module (N47) is assigned a nominal current in a characteristic map. This current is then set in the SPS solenoid valve (Y10) (proportional solenoid valve) and influences the oil flow (hydraulic reaction) within the rack-and-pinion steering, and thus the manual force (K) required at the steering wheel.
The actuation of the SPS solenoid valve (Y10) is pulsed. The current is regulated by pulse-width modulation of these pulses.
| SPS solenoid valve, location / task / design / function | GF46.50-P-5000B |
NO RELATED
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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.