DTC P0452: Evaporative Emission System Pressure Sensor/Switch Low

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 FTPREF or VREF circuit open FTP circuit short to ground or 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 .