escort fault code 1443

Hi; I have a 97 escort [195K Kms] with the fault code 1443- [evaporative emissions control system, purge solenoid or vapor management valve malfunction].
-Anyone know which of these 2 are the most common cause? -Is there a test to check which one is the fault? -Or do you just replace both [the whole unit]
Thanks in advance Bill

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.