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Alldata won't tell you were something goes just by knowing the circuit and pin numbers though.
The low reference wires are important for sure.
21 YEL/BLK 1868 Low Reference goes to terminal B at the crank sensor.
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23 BLK 470 Low Reference goes to fuel tank pressure sensor terminal A. The only way to find these is to look for the pin number and circuit number in all the PCM schematics....finally found all the pics.
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Hmm i never thought about the pcm schematics
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Where might i be able to find the schematics?
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I know there are some publishers you can buy online info from. Try AllData and Mitchell on Demand.
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Their schematics aren't nearly as good as GM's but at least you have access to them all the time.
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