DTC P0451: EVAP System Pressure Sensor - Range/Performance: Condition

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.