Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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That's correct, it has to be a 5 volt reference. This means that if your grounds are good, then the PCM can be bad. You really should check the wave form of the MAF with a scope to be sure that the MAF is indeed good and NOT consuming the .9 of a volt. See attachment.
Then I would be checking into the PCM closer if you're satisfied that the grounds are okay.
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