AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 10)

Page 10 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Two partially assembled harness options are available for the EMS-4:
1. P/N 30-2905-96 EMS-4 Full Harness
2. P/N 30-2905-0 EMS-4 Mini Harness
Photographs and schematics for each are shown above. The Full Harness option is best suited
to applications where no factory harness exists or where modifications are so extensive, it is
easier to build a custom harness. This harness includes a fused power distribution center with
main relay. All circuits are pre-terminated at the ECU connector. All sensor input and actuator
output leads are grouped and clearly labeled. All power and ground splices are pre-configured.
All sensitive communications and CAN data stream circuits are pre-configured.
The Mini Harness option is best suited to applications where the factory harness is suitable as a
starting point for modifications. Like the fully populated harness, the mini version includes pre-
terminated CAN data stream and communications circuits. It also includes primary power and
ground inputs. This is the minimum required for powering up the EMS and enabling
communications. All other harness terminations are the responsibility of the installer. A bag of
Delphi/Packard female terminals is included for terminating all circuits at the main ECU
connector.
Installers choosing the Mini Harness option should refer to the Full Harness schematic
above and the EMS-4 System Diagram that shows an example of a complete system
design.
ECU Terminations with Mini Harness, P/N 30-2905-0
To following steps illustrate how to open the ECU connector backshell so additional circuits can
be added.
Begin by cutting the strain relief tie
wrap holding the terminal bag as
shown.