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Q: Missing return control from ECU to emmission canaster vent valve. on 2003 Volkswagen EuroVan

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Looks like a solid state driver because with the vent valve electrical connection disconnected I originally could read a +3.5 bias voltage which looks like a base to collector voltage without an emmiter groung return indicating a faulty transistor. Is the control driver internal or external to the ECU?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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