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
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