DTC P0451: Evaporative (EVAP) Control System Pressure Sensor Performance: Condition
WARNING: This page is about a different car, the 1999 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Power Control Module (PCM) detects fuel tank pressure is less than -5.3 kPa or more than 5.3 kPa for 5 seconds. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- Fuel Tank Pressure (FTP) sensor or circuit malfunction.
- PCM malfunction.