same as engine vacuum.
A vacuum modulator is used to apply pressure to the throttle valve. The modulator senses the pressure from the manifold and increases when the engine is under a heavier load.
as far as I understand , it does not have a modulator. e4od are electronic. no vacuum shift modulator
If a vacuum modulator has fluid in the vacuum port, it has failed and should be replaced.
That year model did not have a modulator valve on the transmission.
The modulator valve uses hydrological pressure to shift a transmission !
the modulator valve does not have a screw, however, the modulator located outside the modulator valve may or may not have one.
That transmission is electronic controlled. No need for a modulator valve.
Chrysler transmissions do not have modulator valves.
Remove hose and attach a vacuum gauge
Remove the vacuum hose from the modulator valve. If you see any fluid in the valve or the hose, it is defective.
The vacuum modulator is on the front of the transmission. The modulator is a round valve and should have a steel line running from the top of the engine(next to the throttle body) down to the valve.
The 2001 Chevy Impala vacuum module can be found on the back of the engine. The vacuum module valve will be near the top of the engine.