Evap purge valve connector: 4 volts?
 

1999 civic EX coupe

Here's the history report:

-Getting code p1457: leak near evap canister.

-Found the vent shut valve was bad, replaced, worked great for about 3 weeks, then p1457 again.

-Retested the new vent shut valve, it was fine.

-Tested the purge valve using the methods illustrated in the factory service manual, it won't open while engine is hot and rpm > 3500. Actually it won't open regardless.

-Removed Purge Valve, bench tested it with a 12v battery, the valve opens!

-Tested for voltage between the two pins on the connector for the purge valve, there was voltage, but only 4 volts.


So now my question, is the valve supposed to open with only 4 volts, or do I have a bad ground somewhere?