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where is the diagnostic plug on a 1990 plymouth voyager? under hood or under dash? on 1990 Plymouth Grand Voyager

where is the diagnostic plug on a 1990 plymouth voyager?
is it inside the engine or under the dash?

Asked by for the 1990 Plymouth Grand Voyager
It is under the hood, it is black and has about 6 terminals.
thank you, is it under the driver's side or passenger side under the hood. i am a woman,
and i guess i need a little more definite info, thank you very much for your reply.
susie Q