SPS solenoid valve, function - GF46.50-P-5000-01A

Fig 1: SPS Solenoid Valve - Graph

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying SPS Solenoid Valve Function - P-Valve Open

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying SPS Solenoid Valve Function - P-Valve Close

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The P-valve is actuated in cycles with approx. 6V by the ETS, ASR or ESP control module (N47-1, N47-2, N47-5). As vehicle speed increases the current flow reduces and the P-valve opens the control restrictor continuously in accordance with a characteristic (K) defined in the control module. Consequently the oil flow is controlled and also the steering wheel torque.

If the valve is fully energized, (v= 0 km/h), the control restrictor is closed.

Consequently there is no oil flow and the lowest steering wheel torque is adjusted (parking situation).