HX18 DTC P0446 OR P1450: CHECK FOR VISUAL CAUSES OF EXCESSIVE FUEL TANK VACUUM
Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum.
Possible causes:
-- EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
-- EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
-- Fuel vapor elbow on EVAP canister contaminated.
-- Restricted EVAP canister.
-- Canister vent (CV) solenoid stuck closed (partially or fully).
-- Plugged or contaminated CV solenoid filter.
-- EVAP canister purge valve stuck open.
-- Fuel filler cap stuck closed (no vacuum relief).
-- VREF circuit open in fuel tank pressure (FTP) sensor.
-- Damaged FTP sensor.
NOTE:
If the EVAP canister-CV solenoid and fuel tank assemblies are not accessible to perform the following step, GO to the Powertrain/Engine Group, Evaporative Emissions Section in the Workshop Manual for removal procedures.
l Check for kinks or bends in the fuel vapor hoses/tubes (EVAP canister purge outlet tube and EVAP canister tube).
l Visually inspect EVAP canister inlet port, CV solenoid filter and canister vent hose assembly for contamination or debris.
l Check CV solenoid filter for blockage or contamination.
l Is a fault indicated?
Yes
REMOVE any contamination or debris around fuel vapor hoses/tubes and EVAP canister- CV solenoid assembly. REMOVE kinks or bends in EVAP canister purge outlet tube, EVAP canister tube and canister vent hose assembly. GO to �«HX19�».
No
GO to �«HX19�».
Dealer, schmealer... Our car hasn't seen a dealer except for recall and body (hail) work in over 5 years...
Steve
