6. Testing EVAP Canister Vent Solenoid For Blockage
Reconnect fuel vapor control valve tube from EVAP canister purge outlet tube. Lower differential to
access canister vent solenoid. See appropriate DIFFERENTIALS article in DRIVE AXLES. Disconnect
canister vent solenoid from canister vent hose. Pressurize system to 14 in. H2O (3.48 kPa). If pressure
does not drop immediately, go to next step. If pressure drops immediately, replace canister vent solenoid.
Reconnect all components. Perform evaporative emissions system leak test. See EVAPORATIVE
EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK &
EVAP MONITOR "BYPASS" CHECK is performed.
7. Testing Canister Vent Solenoid Hose Assembly For Blockage
Reinstall differential. Lower rear subframe to access EVAP canister and bracket assembly. Lower EVAP
canister and bracket assembly. Disconnect canister vent solenoid hose from 1.0L EVAP canister. See Fig.
8 . Pressurize system to 14 in. H2O (3.48 kPa). If pressure drops immediately, replace canister vent
solenoid hose assembly. Perform evaporative emissions system leak test. See EVAPORATIVE
EMISSIONS SYSTEM LEAK TEST . If system passes, perform DRIVE CYCLES in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Ensure PENDING CODE CHECK &
EVAP MONITOR "BYPASS" CHECK is performed. If pressure does not drop immediately, go to next
step.
Fig. 8: Identifying EVAP Canister Hoses (LS & Thunderbird)
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE System & Component Testing - Gasoline