Is manifold vacuum present at the check valve vacuum source line?
I3 CHECK THE VACUUM CHECK VALVE FOR BLOCKAGE
Reconnect the vacuum source line to the vacuum check valve.
Disconnect the vacuum reservoir line and the EATC module vacuum line from the
vacuum check valve one at a time.
Check for manifold vacuum at the open port on the vacuum check valve.
Is manifold vacuum present at the open port on the vacuum check valve?
Yes
GO to I4.
No
INSTALL a new vacuum check valve. TEST the system for normal operation.
I4 CHECK THE VACUUM CHECK VALVE
Ignition OFF.
Disconnect: A/C Vacuum Check Valve.
Connect the vacuum pump to the vacuum check valve and attempt to pull a vacuum.
Can a vacuum be pulled on the vacuum check valve?
Yes
GO to I5.
No
INSTALL a new vacuum check valve. TEST the system for normal operation.
I5 CHECK THE VACUUM RESERVOIR LINE FOR BLOCKAGE
Disconnect the vacuum reservoir line at the vacuum reservoir.
Connect the vacuum pump to the vacuum reservoir line at the vacuum check valve
connection and attempt to pull a vacuum.
Can a vacuum be pulled on the vacuum reservoir line?
Yes
REPAIR or INSTALL a new vacuum reservoir line. TEST the system for normal
operation.
No
GO to I6.
I6 CHECK THE VACUUM RESERVOIR LINE FOR LEAKS
Plug the vacuum reservoir line at the vacuum reservoir connection.
Leak test the vacuum reservoir line using the vacuum pump.
Does the vacuum reservoir line leak?
Yes
REPAIR or INSTALL a new vacuum reservoir line. TEST the system for normal
operation.
No
GO to I7.
2003 Taurus/Sable Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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