Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test only when directed by QUICK TEST. DTC P0455 will be set in PCM when it senses a -7 in. H2O (-1.74 kPa) drop over 30 seconds. DTC P1443 will be set in PCM when it senses a -7 in. H2O (-1.74 kPa) drop over 30 seconds with more than .02 lb. per minute vapor flow.