DTC P0452 Or DTC P0453: Condition
WARNING: This page is about a different car, the 2002 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0452 is set when Fuel Tank Pressure (FTP) sensor output voltage is lower than -6.6 kPa (FTP sensor output voltage is less than .5 volt), when engine is running. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles.
DTC P0453 is set when FTP sensor output voltage is higher than 6.6 kPa (FTP sensor output voltage is more than 4.5 volts), when engine is running. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles.