AEM 30-3255 Engine Position Module - Manual (Page 4)

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Figure 5.
b) The EPM puts out a 12V square wave, 24 crank signals and 1 short pulse cam
signal every 360 distributor degrees, see figure 6.
Figure 6.
c) Figure 7 shows a typical system diagram for the Honda EPM using an
aftermarket engine management system and coil on plug ignition system.