Some vehicles utilise a "EECS" or "EFI relay which the ECU controls that then powers the injectors and other parts of the EFI Loom. The ME platform offers four controls for either RPM based Master Relay (MR) outputs or just "Ignition On" Master Relay Outputs.


Be sure to connect the master relays trigger ground to a suitable Low Side or Relay Low Side on the ECU (the plug-ins usually have the routed already) and set the Output Setting for that channel to either MR: RPM # or MR: On # depending on which you prefer. (Note if you use RPM enabled outputs, then you will not be able to use test mode on things powered by that relay as the ECU will not turn on the power to these devices (like injectors) until the Master Relay output is triggered via RPM).


You will then need to configure the System> Master Relay Settings:



The Min RPM is the RPM trigger point for the MR: RPM outputs. Enabled must be set to YES, and Inverted will invert the output logic (turning the output off when usually it is on and vice-versa.)