2007 Buick Lucerne CXL v6 MAF sensor

You should unplug the connector at the MAF sensor. You do not need to disconnect the battery, since unplugging the sensor already takes it out of any system.
 
Ok I've got a back probe pin kit from harbor freight. the pins from above on the connector are

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What is "Low Reference"
Is B 12 volt from battery?
 
Something does not add up. My scantool D8S Xtool reads about 5gm/s at iddle. How many gm/s is at 3000Hz per Alldata.

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