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

1994 CHEVROLET BERETTA
160,000 MILES
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SMEDLY
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  • 10 POSTS
do i jump these two for codes instead of a and b ?
Jan 18, 2012 at 3:47 AM
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MHPAUTOS
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  • 31,937 POSTS
see text for explanation.
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Jan 18, 2012 at 4:02 AM
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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 9:23 AM
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