Question about 1991 Subaru Legacy

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The battery has a draw. If Iunplug the air bypass motor it goes away. My question is why would the computer system be powered up with the key off? the power is coming out of the computer side of the terminal.

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  • Master
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Auto trans? if the ignition relay is stuck on, it could cause that to be HOT even if the key is off. check the Yellow/red wire at the air bypass motor,if it has battery power then the relay is stuck OR theres a short to power on that wire. its a brown relay up under and near the steering column.

Posted on Oct 06, 2009

Testimonial: "Theres power at the white wire"

  • Ted Schore Oct 07, 2009

    there is a short, I believe that wire goes to the ECM. I'm not a work so I dont have a wiring diagram but the only wire that should be HOT with the key on is the Y/Gr wire, and it should be dead with key off.

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  • Subaru Master
  • 1,564 Answers

More likley than not there is a short within the valve and it should be exchanged for a new one. If you are able to get one from a salvage yard this would be ideal for they seldom fail. I cannot say that this is precisely your problem without hands on testing of course but I am sure that this is your problem. Thank you, Dana

Posted on Oct 06, 2009

Testimonial: "But why would there be power with the key off?"

  • Dana Newcombe
    Dana Newcombe Oct 06, 2009

    The computer always stores a certain amount of power to retain codes and parameters.

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