P0455

Evaporative emissions control system - large leak or blockage

Detection Conditions

• Fuel tank pressure measured immediately after purge control is stopped with the CDCV closed is too high.

Possible Causes

• Purge solenoid valve malfunction
• CDCV malfunction
• Vent cut valve malfunction
• Loose fuel filler cap
• Charcoal canister malfunction
• Rollover valve malfunction
• Cracked fuel tank
• Fuel tank component parts poorly installed
• Evaporative hose damaged or loose
• Insufficient manifold absolute pressure
• Barometric absolute pressure sensor malfunction
• Fuel tank level sensor malfunction
• Fuel tank pressure sensor malfunction
• Engine coolant temperature sensor malfunction
• Intake air temperature sensor malfunction
• Throttle position sensor malfunction
• Mass airflow sensor malfunction
• Vehicle speed sensor malfunction
• Open or short circuit in wiring harness
• Poor connection of connector

[P0455 - From 1998 Mazda Millenia factory service manual]