Variable Induction Control Valve: Description and Operation

GF09.20-P-6001MLK Component Description For The Variable Intake Manifold Switchover Valve
- ENGINES 113.989 in MODEL 171.473 as of Model Year 09 /Modification Year 08 model refinement package





View of engine from front left
Y22/6 Variable intake manifold switchover valve

Location
The switchover valve is located at the left front of the variable intake manifold.

Task
To control the intake manifold switchover, the switchover valve applies vacuum from the vacuum reservoir to the vacuum unit of the variable intake manifold.

Design
The switchover valve consists of a solenoid, a 2-sided valve plate, three air connections and a 2-pin connector.





Function
1 Aeration (atmosphere)
2 Vacuum from the vacuum reservoir
3 Vacuum to variable intake manifold vacuum unit
A Switchover valve deenergized
B Switchover valve energized (actuated)

The switchover valve is actuated by the intake manifold switchover by the ME-SFI [ME] control unit (N3/10) by means of a ground signal. The voltage supply takes place from "circuit 87 M2".

The valve plate actuated by the coil armature switches between aeration (atmosphere) and vacuum supply from the vacuum reservoir.

In the energized state, connection 1 is closed by the valve plate and a vacuum is created in the variable intake manifold vacuum unit by the vacuum reservoir. The long intake tracts are opened in the variable intake manifold.

In the deenergized state, the connection is restored between connections 1 and 3, which causes the variable intake manifold vacuum unit to be ventilated again (through connection 3). The short intake tracts are opened again in the variable intake manifold.