I don't have any info in front of me (I will in a couple hours) but 0 volts would be a good clue that it's not recieving a proper idle control signal.

EDIT - looking elsewhere on the forum, you should be seeing around 4 volts.

Oh, and KOER

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.