Component description for the variable intake manifold switchover valve - GF09.20-P-6001AMG

ENGINE 156.980 in MODEL 164, 251 up to Model Year 8

ENGINE 156.982 in MODEL 209

ENGINE 156.983 in MODEL 211, 219

ENGINE 156.984 in MODEL 216, 221 up to Model Year 8

Location

The switchover valve is mounted at the front of variable intake manifold.

Fig 1: Locating Variable Intake Manifold Switchover Valve

Courtesy of MERCEDES-BENZ USA

Task

The switchover valve applies vacuum to variable intake manifold vacuum unit to intake manifold switchover (long intake routes) or ventilates it again (short intake routes).

Design

The switchover valve is an electromagnetic switchover valve which is cast in a plastic housing.

The coil resistance about 30 Ω at 20°C.

Function

Fig 2: Switchover Valve Function Diagram

Courtesy of MERCEDES-BENZ USA

The switchover valve is actuated by the ME-SFI control unit (N3/10) from the ground side via its own output stage. The voltage supply takes place from "circuit 87 M2e".

In an activate condition a valve plate is pulled by solenoids and a rubber seal closes the connection (3). The connection between the connection (2) and connection (1) is released in this way and the vacuum from the vacuum reservoir is built up to the vacuum unit.

In the deenergized state the link again exists between connection 2 and 3 through which Connection 1 is supplied with air again.