DTC P0451: Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0451 - EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/SWITCH RANGE/PERFORMANCE
| For Vehicles With NVLD Module | |||
| Description: This DTC sets when the natural vacuum leak detection (NVLD) module pressure switch does not respond to pressure changes in the EVAP system. | |||
Possible Causes:
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| Diagnostic Aids: | |||
| For All Others | |||
| Description: This DTC sets when the PCM detects a fuel tank pressure (FTP) sensor range (offset) concern. The FTP sensor output is offset by greater than 1.7 inches of water or less than - 1.7 inches of water. | |||
Possible Causes:
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| Diagnostic Aids: With the FTP sensor at atmospheric pressure, the FTP PID normally indicates 0 inches of water. Remove the fuel filler cap or, for vehicles with a capless fuel filler pipe, install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe. After installing the supplemental refueling adaptor or removing the fuel filler cap, wait one minute to allow the pressure in the fuel tank to equalize with the ambient air pressure before accessing the PID. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Fiesta | GO to PINPOINT TEST HZ . | ||
| All others | GO to PINPOINT TEST HX . | ||