nsxd11135a.pdf

Testing
1. Check the vacuum line for leaks, blockage or a
disconnected hose.
2. Disconnect the vacuum hose from the throttle
valve dashpot control diaphragm, and connect a
vacuum pump to the hose.
THROTTLE
VALVE
DASHPOT
CONTROL
DIAPHRAGM
4. Connect a vacuum pump to the throttle valve
dashpot control diaphragm.
5. Apply vacuum and check that the rod pulls in and
vacuum holds.
3. Apply vacuum and check the speed the vacuum
goes out.
Vacuum should go out slowly.
VACUUM PUMP/GAUGE
A973X–041–XXXXX
THROTTLE
VALVE
DASHPOT
CHECK VALVE
If the vacuum holds or goes out quickly, replace
the throttle valve dashpot check valve and
retest.
If the vacuum does not hold or the rod does not
move, replace the throttle valve dashpot control
diaphragm and retest.