DTC P0453: Evaporative Emission System Pressure Sensor/Switch High

P0453 - EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/SWITCH HIGH

For Vehicles With NVLD Module
Description: This DTC sets when the natural vacuum leak detection (NVLD) module pressure switch voltage is out of range high.
Possible Causes: NVLD module GND circuit open Damaged NVLD module
Diagnostic Aids:
For All Others
Description: This DTC sets when the signal average jumps above a minimum allowable calibrated parameter.
Possible Causes: Contamination internal to the fuel tank pressure (FTP) sensor connector FTP circuit open FTP circuit short to voltage FTPREF or VREF circuit short to voltage SIGRTN circuit open Damaged FTP sensor
Diagnostic Aids: An FTP voltage PID reading greater than 4.85 volts with the ignition ON, engine OFF or with the ignition ON, engine running, indicates a concern is present.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Fiesta	GO to PINPOINT TEST HZ .
All others	GO to PINPOINT TEST HX .