Air Injection Control Valve: Description and Operation

GF14.30-P-2020V Component Description For The Air Pump Switchover Valve
ENGINE 272.920 in MODEL 203 up to Model Year 8
ENGINE 272.922 in MODEL 211
ENGINE 272.940 in MODEL 203 up to Model Year 8
ENGINE 272.941 in MODEL 203 up to Model Year 8
ENGINE 272.942 in MODEL 171 up to Model Year 8
ENGINE 272.943 in MODEL 211, 219
ENGINE 272.944 in MODEL 211
ENGINE 272.945 in MODEL 251 up to Model Year 8
ENGINE 272.946 in MODEL 221 up to Model Year 8
ENGINE 272.960 in MODEL 203 up to Model Year 8
ENGINE 272.963 in MODEL 171 up to Model Year 8
ENGINE 272.964 in MODEL 211, 219
ENGINE 272.965 in MODEL 221 up to Model Year 8
ENGINE 272.966 in MODEL 230 up to Model Year 8
ENGINE 272.967 in MODEL 164, 251 up to Model Year 8
ENGINE 272.970 in MODEL 203 up to Model Year 8
ENGINE 272.972 in MODEL 211
ENGINE 272.975 in MODEL 221 up to Model Year 8
ENGINE 273.922 in MODEL 221 up to Model Year 8
ENGINE 273.923 in MODEL 164 up to Model Year 8
ENGINE 273.924 in MODEL 221 up to Model Year 8
ENGINE 273.960 in MODEL 211, 219
ENGINE 273.961 in MODEL 216, 221 up to Model Year 8
ENGINE 273.962 in MODEL 211
ENGINE 273.963 in MODEL 164, 251 up to Model Year 8
ENGINE 273.965 in MODEL 230 up to Model Year 8
ENGINE 273.967 in MODEL 209
ENGINE 273.968 in MODEL 221 up to Model Year 8
ENGINE 272.940 in MODEL 209
ENGINE 272.960 in MODEL 209





Y32 Air pump switchover valve (secondary air injection)

Location
The air pump switchover valve is located at the front on the right cylinder head.

Task
The air pump switchover valve actuates the aspirator shutoff valve using vacuum from the intake manifold.





126/2 Right shutoff valve air injection (combination valve: Check valve integrated)
128 Check valve (vacuum)
B6/5 Right intake camshaft Hall sensor
B6/7 Right exhaust camshaft Hall sensor
M33 Electric air pump
Y32 Air pump switchover valve
Y49/5 Right camshaft intake solenoid
Y49/7 Right camshaft exhaust solenoid





1 Air admission
2 Vacuum supply from intake manifold
3 Connection to the air shutoff valves
a Anchor plate
b Restoring spring
c Housing
d Solenoid (coil)
e Electrical connection
F Rubber seal

Design
Electromagnetic switchover valve, voltage supply from terminal 87, coil resistance approx. 28 ohms.





1 Air admission
2 Vacuum supply from intake manifold
3 Connection to the air shutoff valves

Function
When actuating, the anchor plate (a) is pulled by the solenoid (d) and the sealing rubber (f) closes the aeration. The connection between port 2 and port 3 is opened. Thus there is a vacuum built up from the intake pipe to the aspirator shutoff valves. In the deenergized state the connection between port 1 and port 3 is reestablished and air is thus admitted to port 3.