DTC P0451: EVAP System Pressure Sensor - Range/Performance: Condition
WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Engine Control Module (ECM) detects a higher or lower voltage input from Fuel Tank Pressure (FTP) sensor than expected. ECM continuously monitors this circuit. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- Short or open circuit between FTP sensor and ECM.
- FTP sensor malfunction.
- ECM malfunction.
- Fuel Tank Pressure Control Valve (FTPCV) malfunction.