SYSTEM CONNECTORS 1 When performing electrical tests, gently wiggle the wires and connectors to find intermittent problems. The V-MAC IV system utilizes many different connector styles and sizes. The Engine Management System (EMS) Module and the Vehicle Electronic Control Unit (VECU) are some of the largest connectors in the system. These connectors and control units are where the majority of the V-MAC IV system testing is performed. This section illustrates the EMS Module and Vehicle Electronic Control Unit (VECU) connectors and includes charts with connector terminal identification and functions.
The charts should not be used as a replacement for the detailed tests that appear in this manual. The charts are intended as an identification reference for use when repairing a connector or terminal. Engine Management System (EMS) Module The Engine Management System (EMS) Module has two 62 pin connectors. To disconnect a connector from the EMS Module, pull back on the connector lock and gently pull the connector back on its heel and away from the EMS Module. For easy reference, the following illustration shows each pin number as it appears on the connector. Be sure that the connector is aligned as shown below to avoid confusion when checking pin numbers.
The connector numbers and EMS Module orientation are shown as a reference for reconnecting the EMS Module to the engine harness. Figure 1 — EMS Connectors The programming of the Engine Management System (EMS) Module should be performed using Vcads Pro. Page 12 DESCRIPTION AND OPERATION