why does my diagnostic link only have two wires

1994 CHEVROLET BERETTA
160,000 MILES
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SMEDLY
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cant check codes because only have two wires on far right top and bottom
Jan 18, 2012 at 10:28 AM
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WRENCHTECH
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Here's what it should have


Jan 18, 2012 at 10:59 AM
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SMEDLY
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it only has wires to the a and m pins
Jan 18, 2012 at 11:29 AM
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WRENCHTECH
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That's all it needs.
Jan 18, 2012 at 11:32 AM
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SMEDLY
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it has wires only to the a and the m pins
Jan 18, 2012 at 11:33 AM
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SMEDLY
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should it send codes through the a and m pins then ?
Jan 18, 2012 at 11:43 AM
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WRENCHTECH
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It will if you are using the right equipment which I doubt you are. The scan tool has to provide external power because OBD1 links are not powered.
Jan 18, 2012 at 11:49 AM
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SMEDLY
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was told to use a jumper wire to view codes
Jan 18, 2012 at 11:57 AM
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SMEDLY
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they say to jump the a and b terminals
Jan 18, 2012 at 12:00 PM
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WRENCHTECH
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Not on that one.
Jan 18, 2012 at 12:00 PM
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SMEDLY
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what do i need to read my codes ?
Jan 18, 2012 at 12:06 PM
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WRENCHTECH
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A professional scan tool
Jan 18, 2012 at 12:11 PM
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