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 when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

Faulty Canister Vent (CV) Solenoid
Leaks In Filler Cap
Faulty Fuel Tank Pressure (FTP) Sensor
Faulty In-Line Fuel Tank Pressure (FTP) Sensor
Faulty EVAP Canister Purge Valve
Wiring Harness Circuits (CV, FLI, FTP, EVAP CANISTER PURGE, SIG RTN, PWR GND, VPWR & VREF)
Faulty PCM

To identify EVAP system components, see appropriate illustration. See Fig 1-Fig 8 .

Fig 1: Identifying EVAP System Components (Aviator, Explorer & Mountaineer)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying EVAP System Components (Blackwood, Econoline, Excursion, Expedition, Explorer Sport, Explorer Sport Trac, "F" Series Pickup, Navigator & Ranger)