why does my data link only have wires to the a and m pins ?

1994 CHEVROLET BERETTA
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do i jump these two for codes instead of a and b ?
Jan 18, 2012 at 11:47 AM
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see text for explanation.
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Jan 18, 2012 at 12:02 PM
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SMEDLY
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what brand or model code reader can i use on this application
Jan 18, 2012 at 5:23 PM
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