DTC P1450: EVAP Control System Malfunction, Excessive Vacuum: Condition

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.