Change-Over Valve For Intake Manifold Flap N239 - Volkswagen 1.9-Liter TDI Owner's Manual

Change-Over Valve for
Intake Manifold Flap N239
The Change-Over Valve for Intake
Manifold Flap N239 is located in the
engine compartment, in the vicinity of
the Mass Air Flow Sensor G70.
It switches the vacuum for actuating the
intake manifold flap in the intake pipe.
This stops the engine shuddering when
the ignition is turned off.
Diesel engines have a high
compression ratio.
The engine shudders when the ignition is
turned off because of the high compression
pressure of the induced air.
The intake manifold flap interrupts the air
supply when the engine is turned off. Little
air is compressed and the engine runs
softly to a halt.
Function
If the engine is turned off, the Diesel Direct
Fuel Injection Engine Control Module J248
sends a signal to the Change-Over Valve for
Intake Manifold Flap N239, which then
switches the vacuum for the vacuum motor.
The vacuum motor closes the intake
manifold flap.
0 I
Engine Management
2SSP09/068
SSP209/069
47