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

SMEDLY

MEMBER
1994 CHEVROLET BERETTA
160,000 MILES

Do I jump these two for codes instead of a and b?

Wednesday, January 18th, 2012 AT 11:47 AM

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MHPAUTOS

MECHANIC
31,937 POSTS

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

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