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voltage on 800 ckt, 1994 STS

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As part of an ongoing problem, with an IO 34 I was checking the voltage at M on the DLC

I know that the correct voltage is from 3-5 volts with it constantly changing.

When I measured mine it was reading 3.89 to 4.39 volts, and it was constantly changing within this range.

Is there suppose to be a bigger varience, or is this a oorrect range?



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