DTC P1450: EVAP Control System Malfunction, Excessive Vacuum: Condition
WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when PCM detects fuel tank pressure is more than -1.16 in. Hg (-3.92 kPa) for 10 seconds when intake air temperature is more than 14°F (-10°C), engine coolant temperature is less than 95°F (35°C) when engine was first started and now is 212°F (100°C), and vehicle speed is 61.9 MPH or less. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- Canister Drain Cut Valve (CDCV) malfunction.
- Charcoal canister malfunction.
- EVAP air filter plugged.
- Fuel Tank Pressure (FTP) sensor malfunction.
- Plugged EVAP hoses.
- Purge solenoid valve malfunction.