DTC P0451: EVAP System Pressure Sensor - Range/Performance: Condition
WARNING: This page is about a different car, the 2003 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Engine Control Module (ECM) detects Fuel Tank Pressure (FTP) sensor output voltage is out of range with engine running. FTP sensor range should be 1.5-4.2 volts. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- ECM malfunction.
- EVAP canister air filter or air filter passage plugged.
- EVAP canister plugged.
- FTP sensor malfunction.
- FTP sensor circuit malfunction.
- Fuel vapor passage plugged between fuel tank and EVAP canister.