Diagnostic Aids

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 (Blackwood, Econoline, Expedition, Explorer Sport, Explorer Sport Trac, F150 Pickup, Navigator, Ranger & Windstar)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying EVAP System Components (Continental)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying EVAP System Components (Crown Victoria, Grand Marquis, Mustang, Sable, Taurus & Town Car)

Courtesy of FORD MOTOR CO.

Fig 4: Identifying EVAP System Components (Cougar, Escort & Focus)

Courtesy of FORD MOTOR CO.

Fig 5: Identifying EVAP System Components (Escape)

Courtesy of FORD MOTOR CO.

Fig 6: Identifying EVAP System Components (Excursion & F250-F550 Pickup)

Courtesy of FORD MOTOR CO.

Fig 7: Identifying EVAP System Components (Explorer & Mountaineer)

Courtesy of FORD MOTOR CO.

Fig 8: Identifying EVAP System Components (LS & Thunderbird)

Courtesy of FORD MOTOR CO.