July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

ECM Connector Identification

NOTE: When connecting test equipment, disconnect Engine Control Module (ECM) connector "D" first. When reconnecting connectors, connect connector "D" last. See Fig 1

Fig 1: Engine Control Module (ECM) Connector Terminal Identification

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.