AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 108)

Page 108 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Basic ignition phasing settings are similar to those for the fuel injectors. Referring again back to
our example above, there are 4 ignition outputs that fire sequentially spaced 180 crank degrees
or 6 teeth apart.
Coil Name – The coil output. See application pinout sheet or schematic for more information.
Coils #1B – #4B are paired outputs for Coils #1 - #4. In other words, they are the same output
but each firing event can be phased and trimmed independently of the other.
Active – Enables or disables the coil output. Note that a power cycle is necessary after making
changes to these settings.
Knock Sensor #1 – Assigns an coil output to a knock sensor input. Ignition timing changes
defined in the knock control function will be applied according to these settings. The number of
knock sensor inputs varies by application. See pinout sheet or schematic for more information.
Coil Position – Options are leading or trailing. Leading is the default. Trailing ignition outputs
are used on rotary engine applications.
Coil Phasing – Defines the coil output phasing. In the example above, the coil outputs will fire
in order 1
– 2 – 3 – 4 every 6 teeth.