DTC P0452: Evaporative Emission System Pressure Sensor/Switch Low

DTC P0452: EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/SWITCH LOW

For Vehicles With NVLD Module
Description:	This DTC sets when the natural vacuum leak detection (NVLD) module pressure switch voltage is out of range low.
Possible Causes:	NVLD module VBATT circuit open Damaged NVLD module
Diagnostic Aids:
For All Others
Description:	This DTC sets when the signal average drops below a minimum allowable calibrated parameter.
Possible Causes:	Contamination internal to the fuel tank pressure (FTP) sensor connector FTP circuit open VREF circuit open FTP circuit short to ground FTP circuit short to SIGRTN Damaged FTP sensor
Diagnostic Aids:	An FTP voltage PID reading less than 0.22 volt in key ON, engine OFF or key 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 .