Solenoid Valves - Audi 243 Service Manual

Solenoid valves

The 4-level air suspension has 6 electric
solenoid valves.
Discharge valve N111 forms a functional unit
together with the pneumatic discharge valve
and is integrated into the dryer housing (see
page 17).
Discharge valve N111 is a 3/2 way valve and is
closed without current.
The pneumatic discharge valve acts as a
pressure limiter and residual pressure
retaining device.
Compressor
pressure connector Front left
Front right
Rear left
243_010
Pressure accumulator
Rear right
The 4 air spring valves N148, N149, N150,
N151 and accumulator valve N311 are
combined in one valve unit. They are
designed as 2/2 way valves and are closed
without current. The pressure on the air
spring side/accumulator side acts in the
closing direction.
The pressure lines are colour coded to
prevent confusion when connecting.
The colour allocation on the valve block is
echoed by corresponding coloured dots on
the connectors.
Valve unit with
N148, N149, N150, N151
and N311
21