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DTC P1455 - Substantial Leak or Blockage in Evaporative Emission Control
System
The PCM monitors the complete EVAP control system
for no purge flow, the presence of a large fuel vapor leak or multiple
small fuel vapor leaks. The system failure occurs when no purge flow
(attributed to fuel vapor blockages or restrictions), a large fuel vapor
leak or multiple fuel vapor leaks are detected by the EVAP running loss
monitor test with the engine running (but not at idle).
Check this possible causes:
After-market EVAP hardware (such as fuel
filler cap) non-conforming to required specifications
Disconnected
or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or
EVAP return tube
EVAP canister purge valve stuck closed
Damaged
EVAP canister
Damaged or missing fuel filler cap
Insufficient
fuel filler cap installation
Loose fuel vapor hose/tube
connections to EVAP system components
Blockages or restrictions
in fuel vapor hoses/tubes (items also listed under disconnections or
cracks)
Fuel vapor control valve tube assembly or fuel vapor
vent valve assembly blocked
Canister vent (CV) solenoid stuck
open
Mechanically inoperative fuel tank pressure (FTP)
sensor
Check for audible vacuum noise or significant
fuel odor in the engine compartment or near the EVAP canister and fuel
tank
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