DTC P0451: Fuel Tank Pressure Sensor, Performance Problem: 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.
PCM detects to little or to much fuel tank pressure difference when operating evaporative leak monitor function or closing purge solenoid valve. 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 clogging
- Fuel Tank Pressure (FTP) sensor malfunction.
- Plugged charcoal canister malfunction.
- Poor connection at CDCV, FTP sensor or PCM.
- Purge solenoid valve malfunction.
- Short in wiring at CDCV.