AEM 30-1931 Universal Fuel Ignition Controller 8 Channel - Manual (Page 19)

Page 19
Frequency Map (See Figure 30.)
The Frequency Map is used to output a frequency signal from the FIC to the
factory ECU. The frequency functionality is intended for vehicles with frequency based
MAF sensors, such as Karman Vortex or GM Delphi. Using the Frequency Map, the
FIC can mimic, alter, or clamp the input frequency signal. The load input, operating
mode, frequency range, clamp high and low values for the Frequency Map are selected
from the “Frequency” section of the “Setup” window. Three different operating modes
are available, Percent, Frequency, and Offset frequency.
With the frequency range of 250Hz
– 13 KHz selected
 “Percent” mode - With a cell value of 20 and an input frequency of 1 KHz, the FIC
will output 1,200 Hz.
 “Frequency” mode - With a cell value of 11,000, the FIC will output 11 KHz.
 “Offset frequency” mode - With a cell value of -1000 and an input frequency of 10
KHz, the FIC will output 9 KHz.
Figure 29. AFR to Voltage Table.