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View Full Version : What is logic ground ecm civic


hbsbtrouble
Jan 16, 2011, 12:16 PM
Honda Civic Ex 2003, 4-door, automatic trans, 1.7L, vtec: With the key on & Ecm's p31 unplugged from the ecm, and measuring voltage from dlc pin 5 (logic ground for ecm) to chassis ground, I get 9 volt reading. Why is that? How does the logic ground function?