GF14.30-P-2020MOR Component Description For Air Pump Switchover Valve

GF14.30-P-2020MOR Component Description For Air Pump Switchover Valve
ENGINE 275.9 in MODEL 230.4 as of model year 2009 / AEJ 08 model refinement package





View of engine from rear right

5/2 Charge air cooler for right cylinder bank

N92/1 ECI ignition module, right cylinder bank
Y32 Air pump switchover valve
Y101 Divert air switchover valve

Location
The air pump switchover valve located at the rear of the RH cylinder head.

Take care not to confuse with the deceleration air switchover valve.

Task
The switchover valve actuates the air shutoff valve using the vacuum from the intake manifold for air injection.





Design

1 Aeration connection
2 Vacuum pressure supply connection
3 Connection to the air shutoff valves
a Armature disk
b Return spring
c Housing
d Solenoid
e Electrical connection
f Rubber seal





Function

1 Ventilation connection (atmospheric)
2 Vacuum supply connection (from intake manifold)
3 Connection to the air shutoff valves
4 Electrical connection
A Air pump switchover valve energized (vacuum applied to the air shutoff valve)
B Air pump switchover valve deenergized (air shutoff valve ventilated)

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

When energized, the armature disk (a) is drawn by the solenoid (d) and the rubber seal (f) closes connection 1. The connection between connections 2 and 3 is opened and the vacuum from the intake manifold builds up in the air shutoff valves.

In the deenergized state, the connection is restored between connections 1 and 3, which causes the air shutoff valves to be ventilated again (through connection 3).

A check valve ensures that vacuum is not allowed to form (or remain) in the switchover valve. Thus actuation of the air shutoff valves by means of vacuum is guaranteed under all operating conditions.