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The ECU does not give power to the purge VSV, it switches the ground side of the circuit.
(from the '17 wiring diagram) It gets power from the EFI(CTRL) fuse through the EFI MAIN1 relay. Key-on engine-off you should have B+ at the red wire of the purge VSV plug. The ECM switches ground on the yel/green wire to actuate the valve.
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